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Showing 164 types of WEEDS

Alyce Clover

Latin Name: Alysicarpus Vaginalis

Native to the Old World tropics, but introduced to the U.S. and now found throughout the southeastern states north to Virginia, as well as in Hawaii and the West Indies.

Annual Bluegrass

Latin Name: Poa Annua

Native to Europe, but one of the most widely distributed weed grasses in the United States. It thrives in turf, gardens, crops, roadsides, or any other open area.

Annual Sedge

Latin Name: Cyperus Compressus

A native of North America, and found throughout most of the eastern United States and as far west as New Mexico, as well as in Hawaii, Mexico, and the West Indies.

Annual Sowthistle

Latin Name: Sonchus Oleraceus

Native to Europe and found commonly throughout North America.

Bahiagrass

Latin Name: Paspalum Notatum

Native to South America, but now spread throughout all of Latin America, the West Indies, Hawaii, and the southeastern U.S.

Balsam Apple

Latin Name: Momordica Charantia

A native of Asia, this noxious, invasive vine is present in the United States in several eastern states including Florida, west along the Gulf Coast to Texas, and in Hawaii.

Barnyard Grass

Latin Name: Echinochloa Spp.

Native to Eurasia and Africa, and now occurring throughout North America. This grass will grow in virtually any situation, crop or non-crop, landscape and turf.

Bermudagrass

Latin Name: Cynodon Dactylon

Native to Africa, but a common weed now around the world. Several hybrids are used as desirable turf.

Black Medic

Latin Name: Medicago Lupulina

Native to eastern Europe and Asia, but now found throughout the United States.

Black Mustard

Latin Name: Brassica Nigra

Introduced from Europe, and now widespread throughout the United States.

Blackberry

Latin Name: Rubus Sp.

Native to the western United States, where it is found from southern California into southern Canada.

Box Elder

Latin Name: Acer Negundo

Native to North America, and found from coast to coast.

Bracken Fern

Latin Name: Pteridium Aquilinum

Native to North America, and found throughout much of the continent, from Alaska to the east and west coasts.

Broadleaf Dock

Latin Name: Rumex Obtusifolius

Native to Europe and Asia. Now widespread in the United States.

Broadleaf Enchanter's Nightshade

Latin Name: Circaea Lutetiana

Native to North America, and occurring from Maine south to Georgia, and west in all states to the Rocky Mountains.

Broadleaf Filaree

Latin Name: Erodium botrys

Introduced to the United States from the Mediterranean

Broadleaf Pink Purslane

Latin Name: Portulaca Amilis

Native to South America, and found in the United States from North Carolina to all of Florida.

Broadleaf Plantain

Latin Name: Plantago Major

Native to Europe, but naturalized and now found commonly throughout the United States and southern Canada.

Broom Groundsel

Latin Name: Senecio Spartioides

Native to the western United States.

Buckhorn Plantain

Latin Name: Plantago Lanceolata

Introduced from Europe, and now found throughout the United States and Canada.

Bulbous Bittercress

Latin Name: Cardamine Bulbosa

Native to North America, and found in nearly every state east of the Rocky Mountains.

Burclover

Latin Name: Medicago Polymorpha

Native to Eurasia, and now widespread in the western United States.

Bushy Buttonweed

Latin Name: Spermacoce Assurgens

Found in warm, humid climates of most continents, as well as Hawaii, the West Indies, and from Florida to Louisiana. Considered a native in the U.S., but also found throughout Latin America and in Asia.

Camphorweed

Latin Name: Heterotheca Subaxillaris

Native to North America, and found widely from the east coast along the southern 2/3 of the United States to California, and south into Mexico.

Canada Thistle

Latin Name: Cirsium Arvense

Native to southeastern Eurasia, but introduced to Canada in contaminated crop seeds in the 18th century, and now found throughout the northern half of the United States and southern Canada.

Carolina Geranium

Latin Name: Geranium carolinianum

Native to the United States, and widely distributed in the United States.

Carpetgrass

Latin Name: Axonopus Affinis

Found throughout the world in mild climates, and in the U.S. in the eastern half of the country.

Carpetweed

Latin Name: Mollugo Verticillata

Native to tropical America, now distributed widely in the U.S.

Catchweed Bedstraw

Latin Name: Galium Aparine

Native to North America and widespread across the continent.

Cheat

Latin Name: Bromus Secalinus

Introduced from Europe, and now common throughout the United States.

Chicory

Latin Name: Chichorium Intybus

Native to Europe, but now found throughout the United States, and especially abundant in the northern and western states where it is a common roadside weed.

Clustered Clover

Latin Name: Trifolium Glomeratum

Native to Europe, but introduced to North America where it now is found uncommonly in the southeast states as well as California, Oregon, and Hawaii.

Coast Fiddleneck

Latin Name: Amsinckia Intermedia

Coast fiddleneck is native to Oregon and California.

Common Chickweed

Latin Name: Stellaria Media

Introduced from Europe, and now widely distributed throughout the United States and Canada.

Common Cinquefoil

Latin Name: Potentilla Canadensis

A native plant found throughout the eastern third of the United States, and west to Wisconsin, Arkansas, and Texas.

Common Cocklebur

Latin Name: Xanthium Strumarium

Native to North America and found throughout the United States, as well as many other temperate areas of the world. It is particularly common in the southern states and into Mexico.

Common Groundsel

Latin Name: Senecio Vulgaris

Introduced from Europe, and now widespread in the northern United States and Canada, and as far south as Texas and throughout the western states. An extremely common winter and spring weed.

Common Lambsquarters

Latin Name: Chenopodium Album

Native to Europe, and now an extremely common weed throughout the United States.

Common Mallow

Latin Name: Malva Neglecta

Native to Europe - widespread in United States.

Common Purslane

Latin Name: Portulaca Oleracea

Naturalized from Europe, and now a common problem weed throughout the world.

Common Ragweed

Latin Name: Ambrosia artemisiifolia

Native to the eastern United States, and still most common there, but found throughout North America.

Common Velvetgrass

Latin Name: Holcus Lanatus

Native to Europe and now widespread throughout the United States. Less common in the far northern states. It was introduced as a forage grass, but easily escapes cultivated areas.

Common Yarrow

Latin Name: Achillea Millefolium

Native to Eurasia, but naturalized in the United States and common and widespread throughout North America.

Corn Spurry

Latin Name: Spergula Arvensis

Introduced from Europe, and naturalized throughout the western United States, somewhat in the eastern part of the country.

Crimson Clover

Latin Name: Trifolium Incarnatum

A native of Europe, but introduced as an ornamental plant to many other areas, and now widely spread throughout the United States in the eastern half of the country and along the west coast, as well as in Hawaii.

Crowfootgrass

Latin Name: Dactyloctenium Aegyptium

Introduced from the Old World Tropics of Asia or Africa, and now found throughout much of the U.S., particularly in the southern states, and south throughout Latin America, in Europe, Australia, and Hawaii.

Curly Dock

Latin Name: Rumex Crispus

Native to Europe and Asia. Now widespread in the United States.

Cylindric Sedge

Latin Name: Cyperus Retrorsus

A native plant in southeastern North America, now found from New York to Florida, and west to Texas and Oklahoma.

Cypress

Latin Name: Cupressaceae

Dallisgrass

Latin Name: Paspalum Dilatatum

Native to South America, now common throughout the southwest United States.

Dandelion

Latin Name: Taraxacum Officinale

Introduced from Europe and now widespread and extremely common across North America.

Deergrass

Latin Name: Muhlenbergia Rigens

Native to the west coast of the United States. Commonly used in ornamental settings due to its size and symmetry.

Diatoms

Latin Name: Diatomaceae

Diffuse Lovegrass

Latin Name: Eragrostis Diffusa

Native to the western United States.

Dogfennel

Latin Name: Eupatorium Capillifolium

A native plant in North America, and found from New Jersey south to Florida, and west to Missouri and Texas. It also can be found in Latin America south to Guatemala and in the West Indies.

Downy Brome

Latin Name: Bromus Tectorum

Introduced from the Mediterranean in packing materials, and now widely distributed throughout North America.

Eclipta

Latin Name: Eclipta Prostrata

Native to the eastern United States, but now spread throughout the country, most commonly found in the southern U.S.

Fall Panicum

Latin Name: Panicum Dichotomiflorum

Native to central and eastern United States, now spread throughout the western states as well.

False Green Kyllinga

Latin Name: Kyllinga Gracillima

Native to the United States and Latin America, and found in the U.S. from Arkansas east to Georgia and north to New York. It also occurs in Hawaii.

Fanwort

Latin Name: Cabomba Spp.

Two species of fanwort are native to the southeastern United States, and occur throughout the southeast as native plants, and in the Pacific Northwest and the Northeast as exotic invaders.

Fern, sweet

Latin Name: Comptonia peregrina Coult

Native to eastern North America, and occurring in the United States from Minnesota southeast to Georgia and along the entire east coast except for Florida.

Field Bindweed

Latin Name: Convolvulus Arvensis

Native to Eurasia but introduced to the United States, where it occurs throughout the continent, and is considered to be one of the most troublesome weeds here and throughout the world.

Field Pennycress

Latin Name: Thlaspi Arvense

Introduced from Europe and now found throughout the United States. It grows commonly in grain fields and pastures, and the strong odor of the plant causes a bitter flavored milk from livestock that eat it.

Filamentous Green Algae

Latin Name: Zygnematales

Florida Pusley

Latin Name: Richardia Scabra

Considered native to South America, but found commonly in the southeast United States and into the northeast, in Hawaii and Puerto Rico, and throughout Central America.

Fringed Black Bindweed

Latin Name: Polygonum Cilinode

A native vine found in the states east of the Mississippi and in Minnesota, but not generally in the extreme southern states.

Giant Reed

Latin Name: Arundo Donax

Native to warmer areas of Europe, and introduced to California as an ornamental and wind-break planting, as well as for use as a roofing material, mats or screens. It easily escapes cultivation and has become a major problem in natural settings due to its aggressive and dominating growth. In particular it is noxious in areas along river shores, irrigation or ditchbanks, and drainage canals. It grows in tall, solid thickets that may overwhelm large areas.

Globe Sedge

Latin Name: Cyperus Croceus

A native plant in eastern North America, occurring from Pennsylvania south throughout Florida, and west to Texas, Oklahoma and Missouri. It also occurs in Latin America and the West Indies as well as eastern Asia.

Goldenrod

Latin Name: Solidago Spp.

Over 150 species of goldenrod occur in North America, and some will be found in every state including Hawaii, throughout Canada and into Latin America and the West Indies. Many of the species are native plants in North America.

Goosegrass

Latin Name: Eleusine Indica

Introduced from Europe, but now found throughout most of the United States.

Gopher-tail Lovegrass

Latin Name: Eragrostis Ciliaris

Native to Europe, but now found throughout the world, including throughout Latin America and in North America along the east coast states and west to Texas.

Green Kyllinga

Latin Name: Kyllinga Brevifolia

Native to either the American Tropics or Old World tropical areas, and now found throughout the southwestern United States and in Hawaii. It is becoming a major problem in ornamental plantings, and in turf, where it quickly and aggressively crowds out desirable grasses.

Ground Cedar

Latin Name: Lycopodium Complanatum

Native to North America, where it is found from Alaska throughout Canada and throughout the northern third of the United States from Oregon to the east coast.

Ground Ivy

Latin Name: Glechoma Hederacea

Native to Eurasia, but introduced to North America as a garden and herbal plant. It now is found throughout North America to Alaska, with the exception of the dry southwestern states of Nevada, Arizona, and New Mexico.

Henbit

Latin Name: Lamium Amplexicaule

Native to Europe, but now spread throughout North America.

Horsenettle

Latin Name: Solanum Carolinense

Native to the southeastern United States, but now spread from coast to coast and occurring in almost every state, as well as into southern Canada.

Horseweed

Latin Name: Conyza Canadensis

Native to North America and widely distributed throughout the continent.

Italian Ryegrass

Latin Name: Lolium Multiflorum

A native of Europe, and now widespread throughout the United States.

Johnsongrass

Latin Name: Sorghum Halepense

Native to the Mediterranean region, but deliberately introduced to the United States as a grass desirable for forage. Now widespread throughout the warm regions of the U.S. where it is a severe pest weed problem.

Jungle Rice

Latin Name: Echinochloa Colona

Native to Europe, and now widespread throughout the west and southwest United States. Found commonly in both cultivated fields and in waste areas.

Kikuyugrass

Latin Name: Pennisetum Clandestinum

Native to tropical Africa, but introduced deliberately to California as a cover along slopes and ditch banks for erosion control. As a very fast growing grass it also has been used for a turfgrass, but it is capable of escaping and invading other grasses where it is objectionable.

Knawel

Latin Name: Scleranthus Annuus

Introduced from Europe, and found throughout the eastern half of the United States and Canada, as well as in California and the Pacific Northwest.

Kochia

Latin Name: Kochia Scoparia

Native to Eurasia, this plant was introduced to North America and now is found in nearly every state, with the exception of the extreme southeast.

Kudzu

Latin Name: Pueraria Thunbergiana

Native to Japan and China, and introduced during an 1896 gardening exposition in Philadelphia.

Large Crabgrass

Latin Name: Digitaria Sanguinalis

Native to Europe and now widespread in the United States.

Lawn Burweed

Latin Name: Soliva Pterosperma

Native to South America, and now found along the Pacific Coast states and along the southern states to North Carolina, as well as throughout Latin America and in Europe.

Little Bittercress

Latin Name: Cardamine Oligosperma

Native to North America, and found most commonly in the western states, east to Montana and Colorado, but occurring sporadically in the north central to northeast states as well. Found also in western Canada north to Alaska.

Liverworts

Latin Name: Hepaticae

Found throughout North America in excessively moist soils.

London Rocket

Latin Name: Sisymbrium Irio

A native of Europe, now common throughout the western states.

Long Beechfern

Latin Name: Phegopteris Connectilis

Native to North America, and found in most states in the upper half of the United States and in southern Canada, from coast to coast.

Marsh Bedstraw

Latin Name: Galium Tinctorium

Native to North America, and found throughout the eastern half of the U.S. and Canada, and west to Texas and possibly Arizona.

Mouse-ear Chickweed

Latin Name: Cerastium Vulgatum

Native to Europe, and now found throughout most of the United States and southern Canada.

Narrowleaf Cudweed

Latin Name: Gnaphalium Falcatum

Native to North America and Latin America, and occurring in the United States from Virginia to Florida on the east coast, and west throughout the southern states to California.

Netseed Lambsquarters

Latin Name: Chenopodium Berlandieri

Native to Europe, and now established in the western United States.

Orchardgrass

Latin Name: Dactylis Glomerata

Native to Eurasia, now widespread throughout much of the United States.

Owl's Clover

Latin Name: Orthocarpus Purpurascens

A native plant that is widely distributed in the western United States, south into Mexico and north into southern Canada.

Oxeye Daisy

Latin Name: Chrysanthemum Leucanthemum

A native of Europe that was introduced as an ornamental plant, this has escaped cultivation and now is found in meadows, roadsides, and empty lots, as well as turf and landscape.

Parrotfeather

Latin Name: Myriophyllum Aquaticum

Native to South America, but introduced to the United States and sold as aquatic plants. It was planted in ponds and aquariums and has now spread widely across North America.

Pennsylvania Smartweed

Latin Name: Polygonum Pensylvanicum

Native to eastern North America, and introduced to the western states where it now can be found throughout most of the continent.

Pennywort

Latin Name: Hydrocotyle Spp.

At least 15 species of Hydrocotyle occur in the United States and Hawaii, all very similar in appearance and habits. Most are native plants that occur primarily in warmer, more tropical climates.

Perennial Ryegrass

Latin Name: Lolium Perenne

Native to Europe, but now widely distributed throughout the United States.

Persian Speedwell

Latin Name: Veronica Persica

Native to Europe and now widespread in North America.

Pine

Latin Name: Pinaceae

Pineapple Weed

Latin Name: Matricaria Matricarioides

Native to the western United States, but now found across the continent to the east coast and as far north as Alaska.

Prickly Sida

Latin Name: Sida Spinosa

Native to tropical Latin America and southern United States, and found throughout the eastern half of the U.S. and west into Arizona. It also has been introduced to Hawaii as a common roadside weed.

Prostrate Knotweed

Latin Name: Polygonum Arenastrum

Introduced from Europe. Now found throughout the United States and southern Canada.

Prostrate Spurge

Latin Name: Chamaesyce Humistrata

Native of the United States, and widely spread across the continent and south into South America

Puncture Vine

Latin Name: Tribulus Terrestris

Native to the Mediterranean area and southern Europe. Now scattered over much of the U.S.

Purple Cudweed

Latin Name: Gnaphalium Purpureum

Found from South America to North America, where it is found throughout the United States.

Purple Loosestrife

Latin Name: Lythrum Salicaria

Native to Europe, but introduced as an ornamental plant to North America, where it now occurs in nearly every state in the U.S. with the exception of the arid Southwest and the extreme Southeast. It also occurs throughout most of Canada.

Purple Nutsedge

Latin Name: Cyperus Rotundus

Native to Europe, but now thoroughly spread around the world on all continents. In North America it is found primarily in the southern states from California to Florida, and north to Missouri and New York, as well as a few other states. It occurs in the West Indies, Hawaii, and throughout Latin America.

Purple Sedge

Latin Name: Cyperus Ligularis

Native to southeastern United States and the West Indies, and found in Florida, Mississippi, California, and Latin America, as well as in Africa.

Quackgrass

Latin Name: Agropyron Repens

Introduced from Europe and now found throughout most of the United States, with the exceptions of the warm southern areas from South Carolina to Arizona.

Rabbitfoot Clover

Latin Name: Trifolium Arvense

A native of Europe, but introduced to North America where it now occurs throughout the eastern half of the United States, all of southern Canada, and in the western U.S. along the Pacific Coast and in the states bordering Canada. It also occurs in Hawaii.

Rat-tail Fescue

Latin Name: Vulpia Myuros

Introduced from Europe, and now found throughout the United States, in southern Canada and Latin America, as well as in Alaska and Hawaii. V. myuros and F. megalura are sometimes separated as two species, but currently combined as only one.

Red Clover

Latin Name: Trifolium Pratense

Native to Eurasia, but introduced as a pasture plant which has escaped cultivation and is now widespread in the United States.

Red Sorrel

Latin Name: Rumex Acetosella

Native to Europe, now distributed widely across the United States and southern Canada.

Red Sprangletop

Latin Name: Leptochloa Filiformis

Native to tropical Latin America.

Redroot Pigweed

Latin Name: Amaranthus Retroflexus

Native to tropical Latin America, but now widespread in the United States.

Redstem Filaree

Latin Name: Erodium cicutarium

Native to Europe and Asia, now common throughout the world.

Reed Canarygrass

Latin Name: Phalaris Arundinacea

Native to Eurasia, and now found throughout the northern United States and Canada.

Rescuegrass

Latin Name: Bromus Catharticus

Native to South America, and introduced to the United States for cultivation as a winter forage in the southern states. Strong growth in winter and early spring make it suitable for forage. It commonly escapes cultivated areas and becomes troublesome in crops or non-crop situations.

Ripgut Brome

Latin Name: Bromus Diandrus

Native to Europe, and now widespread along the Pacific Coast states. It is a very common weed species in rangeland, roadsides, waste areas, or ditchbanks, where it may compete with native plants.

Russian Knapweed

Latin Name: Acroptilon Repens

A native of Eurasia that was introduced to the United States in the late 1800’s, and now is widely distributed over the western U.S.

Russian Thistle

Latin Name: Salsola Tragus

Native to Eurasia, but introduced to the United States from Russia in sacks of flaxseed, that spilled along railways as it was transported, spreading the weed throughout the western U.S.

Salvinia

Latin Name: Salviniaceae

Shepherd's Purse

Latin Name: Capsella Bursa-pastoris

Native to Eurasia, but now found throughout North America as far north as Alaska.

Silverleaf Nightshade

Latin Name: Solanum Elaeagnifolium

Native to the central United States, but introduced to the western states where it now is widespread in southern and central California.

Silversheath Knotweed

Latin Name: Polygonum Argyrocoleon

Native to southwest Asia

Smooth Crabgrass

Latin Name: Digitaria Ischaemum

Native to Europe and now widespread in the United States.

Smooth Scouring-rush

Latin Name: Equisetum laevigatum

A native of the United States, distributed widely in California.

Spanish Clover

Latin Name: Lotus Purshianus

Native to the western United States, and widely distributed from southern Canada south into Mexico in the west.

Sticky Chickweed

Latin Name: Cerastium Glomeratum

Native to Europe, and now found throughout the United States.

Subterranean Clover

Latin Name: Trifolium Subterraneum

Native to Europe and introduced to the United States, where it now is found along the Pacific Coast, and from Louisiana along the Gulf States to Florida and sporadically north along the Atlantic Coast.

Surinam Sedge

Latin Name: Cyperus Surinamensis

Native to the southeastern United States, and found from Florida and South Carolina west to Texas and Oklahoma, as well as in the West Indies and throughout Latin America.

Swamp Smartweed

Latin Name: Polygonum Amphibium

Native to Eurasia, and now found throughout much of North America.

Sweet Vernalgrass

Latin Name: Anthoxanthum Odoratum

Native to Europe, and now spread widely across the U.S. , south through Latin America, and in Asia and Australia.

Texas Sedge

Latin Name: Cyperus Polystachyos

Native to southeastern United States and Latin America, but found throughout the world in tropical habitats. In the U.S. it is found from Maine to Florida, west to Texas and Missouri, and in Hawaii. It also is in the West Indies, Asia, and Europe.

Timothy

Latin Name: Phleum pratense

Native to Eurasia, but introduced as a forage crop and cultivation for hay. Now escaped and naturalized throughout most of North America.

Torpedograss

Latin Name: Panicum Repens

Thought to have originated in Europe, but now found on most continents and in the U.S. from the Carolinas along the Gulf states to Texas.

Tufted Knotweed

Latin Name: Polygonum Caespitosum

Native to Asia, and now found along the entire east coast of the United States, south through Florida and west to Louisiana.

Tufted Kyllinga

Latin Name: Kyllinga Pumila

Native to North America, and found throughout most of the eastern half of the U.S. from Kansas and Texas east to New York and Florida, and south throughout Latin America and the West Indies.

Tumble Mustard

Latin Name: Sisymbrium altissimum

Native to Europe, but now found throughout North America in nearly all states of the U.S., including Alaska and Hawaii.

Tumble Pigweed

Latin Name: Amaranthus Albus

Native to tropical Americas, and now widespread throughout much of North America.

Turkey Mullein

Latin Name: Eremocarpus Setigerus

A native of the western United States, and found commonly from southern California north to Washington, particularly in the more arid locations away from the coast.

Unicellular Blue-Green Algae

Latin Name: Chroococcales

Vaseygrass

Latin Name: Paspalum Urvillei

Native to South America, but introduced as a forage plant, and now spread throughout the southern half of the U.S. from Virginia to California.

Velvetleaf

Latin Name: Abutilon Theophrasti

Native to southern Asia, but introduced to the United States as an ornamental plant and now found throughout the U.S., southern Canada, and into Latin America as an escape from cultivation.

Virginia Buttonweed

Latin Name: Diodia Virginiana

Native to the United States, and found from Texas north to Illinois, east to the Atlantic coast and south to all the Gulf Coast states.

Wall Bedstraw

Latin Name: Galium Parisiense

Native to the Mediterranean region.

Water Hyacinth

Latin Name: Eichhornia Crassipes

Native to Latin America, and thought to have been introduced to the United States as an ornamental plant. Now present throughout the milder climates of the U.S., from Florida to California, where it can be a severe problem in navigable waterways and irrigation canals, where its thick, smothering growth obstructs movement and water flow.

Water Lettuce

Latin Name: Pistia stratiotes

Western Ragweed

Latin Name: Ambrosia Psilostachya

Native to the western United States, and found from Mexico to southern Canada and as far east as Illinois.

White Clover

Latin Name: Trifolium Repens

Native to Europe, but introduced as an ornamental and forage plant, and now found commonly throughout North America. It is a weed in turf grasses and landscape, as well as in many crop settings. It tolerates close mowing and becomes a problem by outcompeting the turf.

White Kyllinga

Latin Name: Kyllinga Nemoralis

Native to Asia, and introduced to Hawaii, where it is a common turf weed, and even may be used as a turf substitute in some situations.

Wild Buckwheat

Latin Name: Polygonum Convolvulus

Introduced from Europe, and now widespread throughout the United States and southern Canada.

Wild Carrot

Latin Name: Daucus Carota

Native to Europe and introduced as a garden plant. It escaped cultivation and is now a common and problem weed throughout North America.

Wild Mustard

Latin Name: Brassica Kaber

Native to Eurasia, and now found throughout the United States.

Wild Oats

Latin Name: Avena Fatua

Native to Europe, now widespread in the United States, being most common in the western half of the country. In California it is the most widespread and noxious of the winter annual grass weeds.

Wild Radish

Latin Name: Raphanus Sativus

Native to Europe, and now widespread in North America. The garden variety of radish is a cultivated form of wild radish. R. sativus is white-flowered, while R. raphanistrum is yellow-flowered.

Witchgrass

Latin Name: Panicum Capillare

Native to the eastern United States, and now common throughout the U.S. and southern Canada.

Yellow Nutsedge

Latin Name: Cyperus Esculentus

Native to the Old World, but now spread throughout the world, including all of the United States, much of Canada, and south through the tropical areas of South America. It is one of the most important weed pests in the U.S. and much of the rest of the world.

Yellow Starthistle

Latin Name: Centaurea Solstitialis

Introduced from Europe, and now one of the worst weed problems in rangeland and open areas in the western United States, particularly in California.

Yellow Woodsorrel

Latin Name: Oxalis Stricta

Native to Europe but distributed throughout the world.

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