Colorado Noxious Weed ActC.R.S Title 35 Article 5.5 Section 101-118

Duty to control weeds. It is the duty of all persons owning land or any interest therein in the district, the department of transportation , the board of county commissioners, school boards, the governing authorities of incorporated towns and cities and of railroads and ditch companies, and those persons supervising state-owned lands to use reasonable means to control the noxious weeds if the same are likely to be materially damaging to the land of neighboring landowners.

Noxious Weeds List

Yuma County Noxious Weeds List

Field Bindweed

Field bindweed is primarily a weed of nurseries, agronomic crops, and fence rows that are found throughout the US.

Canada thistle

Canada thistle (Cirsium arvense) is an aggresive, creeping perennial weed.

Musk thistle

(Carduus nutans) is a member of the sunflower family Asteraceae.

Silverleafed povertyweed

A perennial species in the Aster family.

Woolyleafed povertyweed

(Ambrosia grayi)

Jointed goatgrass

(Aegilops cylindrica) It is so closely related to wheat that both species can interbreed. 

Leafy spurge

Leafy spurge is a member of the euphorbiaceae family, and ranges 6 to 36 inches in height.

Diffuse Knapweed

(Centaurea diffusa), is a member of the genus Centaurea in the family Asteraceae.

Spotted knapweed

(Centaurea maculosa) an annual or short-lived perennial that reproduces solely from seed. 

Russian knapweed

(Acroptilon repens) is a creeping, herbaceous perennial of foreign origin that reproduces from seed and vegetative root buds. 

Salt cedar (Tamarix)

Absorbs large amounts of water and creates large deposits of salt. 

Hoary cress

(Cardaria draba) also known as whitetops) was introduced to the U.S. from Europe late in the 19th century. 

Dalmatian toadflax

Dalmatian toadflax, Linaria dalmatica (L.) Mill. (Scrophulariaceae), is a plant native from central Europe east to central Asia. 

Russian-olive

Takes over streambanks, lake shores and prairies, choking out native vegetation of riparian habitat

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State of Colorado A List

African rue

Commonly called wild rue. African rue is a perennial, herbaceous plant, with a woody underground root-stock.

Camelthorn

Camelthorn species have proportionally the deepest root system of any plants – a 1 m high shrub may have a main root more than 15 m long.

Common crupina

The ridged stem has many branches, and is leafy below. They generally wither by flowering.

Cypress spurge

The plant ranges from 8 inches to 16 inche. Its petal-like bracts are usually green-yellow, maturing to purple or red from May to August.

Dyers woad

(Isatis tinctoria) is a flowering plant in the family Brassicaceae.

Elongated mustard

(Brassica elongata) Elongata has been able to disrupt the ecosystems of their native plant habitats and has been label as an invasive species. 

Flowering rush

(Butomus)  is the only known genus in the plant family Butomaceae.  It is considered invasive.

Giant reed

(Arundo donax) grows in damp soils, either fresh or moderately saline. 

Giant salvinia

It is a free floating plant that does not attach to the soil, but instead remains buoyant on the surface of a body of water. 

Hairy willow-herb

(Epilobium hirtigerum) is a species in the family Onagraceae.

Japanese/Giant/Bohemian knotweed

(Reynoutria japonica)  is a large species of herbaceous perennial plant of the knotweed and buckwheat family Polygonaceae.

Meadow knapweed

(Centaurea) is a genus of between 350 and 600 species of herbaceous thistle-like flowering plants in the family Asteraceae.

Mediterranean sage

(Salvia aethiopis) is a species of perennial plant.  It is unpalatable to livestock, and it becomes a physical nuisance due the similarity of the persistent dried stems to tumbleweed.

Medusa’s head

This succulent resembles the head of Medusa, with many serpent-like stems arising from a short, central caudex.

Myrtle spurge

 (Euphorbia myrsinites) is a succulent species of the spurge.

Orange hawkweed

(Pilosella aurantiaca)  is a perennial flowering plant in the daisy family Asteraceae. 

Parrot’s feather

Parrot feather is a perennial plant. Parrot feather gets its name from its feather-like leaves that are arranged around the stem in whorls of four to six.

Purple loosestrife

(Lythrum salicaria) is a herbaceous perennial plant, forming clonal colonies 1.5 m or more in width with numerous erect stems growing from a single woody root mass.

Rush skeletonweed

It is a thin, spindly plant which reaches a meter in height. It starts from a basal rosette of leaves and branches extensively, often forming a weedy thicket.

Squarrose knapwwed

Squarrose knapwwed, plants are taprooted perennials and may reach a height of 36 inches.

Tansy ragwort

Tansy ragwort is a very common wild flower in the family Asteraceae.

Yellow starthistle

The plant is a thorny winter annual species in the knapweed genus.