Noxious Weed Table
|Weed Name||Scientific Name||Weed Description|
|Russian Knapweed||Acroptilon repens||
Russian knapweed is a member of the Asteraceae or Sunflower family. Russian knapweed grows 1 to 3 feet tall. Stems are erect, covered with fine, white hairs, and openly branched. Lower leaves are often lobed and toothed, and 2 to 4 inches long. Upper leaves are entire or serrated on upper leaf margins, but are attached to the stem without a stalk at their base. Flowers are cone-shaped and 1/4-to 1/2- inch in diameter. Flower heads, found at the tip of the leafy branches of the plant, are usually pink to lavender in color.
|Absinth Wormwood||Artemisia absinthium||
Absinth wormwood, also known as American or common wormwood, mugwort or madder wort, and wormwood sage, is a member of the Asteraceae family.
|Musk Thistle||Carduus nutans||
Musk thistle or nodding thistle, is a member of the Asteraceae or sunflower family. Musk thistle can grow up to 6 feet tall. Upright stems of the plant are winged and can be single or multiple and highly branched. Rosette leaves of the plant are elliptic to lanceolate and pinnately lobed with each lobe ending in a spine. Leaf surfaces are green, glabrous to densely pubescent with margins ranging from white to purple in color. Cauline leaves, of or attached to the stem, are similar to the rosette leaves, but are smaller, simple, alternate, and decurrent.
|Diffuse Knapweed||Centaurea diffusa||
Diffuse knapweed is a member of the Asteraceae or Sunflower family. Diffuse knapweed grows 1 to 3 feet tall from a deep taproot. Upright stems of the plant have numerous spread branches, giving a ball-shaped, tumbleweed appearance. Basal leaves, which form rosettes on a central crown, are borne on short stalks and are deeply divided into lobes on both sides of the vein. Stem leaves of the plant are stalkless and become progressively smaller and less divided higher up the stem, with the uppermost small leaves being bractlike.
|Spotted Knapweed||Centaurea maculosa||
Spotted knapweed is a member of the Asteraceae or sunflower family. Spotted knapweed can grow 1 to 3 feet tall. Basal rosette leaves are borne on short stalks and grow up to 6 inches long. Rosette leaves are deeply divided into lobes on both sides of the center vein. Spotted knapweed stems can have more than one stem and are branched on the upper half. Stem leaves are alternate, sessile, and have few lobes, or they are linear and entire, and are smaller toward the uppermost part of the stem. Flower heads are born solitary or in clusters of two or three and are found at the branch ends.
|Canada Thistle||Cirsium arvense||
Canada thistle, also referred to as creeping thistle and California thistle, is a member of the Asteraceae or sunflower family. The plant is a herbaceous perennial that can grow up to 4 feet tall. Stems of the plant are erect, grooved, nearly smooth or hairy. Mature leaves are spiny with deeply lobed leaves and several branching flower stalks. Leaves are alternate, oblong, or lanceolate usually with crinkled edges and spiny-toothed margins that terminate in a spine. Leaves of the plant can be hairy or smooth.
|Leafy Spurge||Euphorbia esula||
Leafy spurge is a member of the Euphorbiaceae or spurge family. Leafy spurge is a perennial that grows up to 3 feet tall. Stems of the plant are hairless, pale green or blue-green and usually thickly clustered. Leaves are narrow, hairless, and are alternate on the stem. Both leaves and stems exude a milky latex substance when the plant is damaged. Leafy spurge flowers are yellowish-green, small, arranged in numerous small clusters and surrounded by a pair of yellow-green, heart-shaped bracts that are often mistaken for flowers.
|Dalmatian Toadflax||Linaria genistifolia||
Dalmatian toadflax is a member of the Scropulariaceae or figwort family. Dalmatian toadflax is a herbaceous perennial weed with stems that are robust and somewhat woody at the base and smooth towards the top of the plant. Stems of Dalmatian toadflax are waxy and can grow 2 to 3 feet tall. The leaves of the plant are alternate, light green, waxy, and heart-shaped. The base of the leaf tends to clasp the stem. Flowers, which grow at the bases of upper leaves, resemble a snapdragon and are bright yellow with an occasional orange colored throat.
|Yellow Toadflax||Linaria vulgaris||
Yellow toadflax, also referred to as butter-andeggs, jacob’s ladder, common toadflax, toadflax, ommon linaria, and wild snapdragon, is a member of the Scrophulariaceae or figwort family. Yellow toadflax is a herbaceous perennial with stems that are somewhat woody at the base and smooth towards the top of the plant. Stems of yellow toadflax are sparingly branched and usually 1 to 3 feet tall. Leaves are linear, narrow, pointed at both ends, and usually 1 to 2 inches in length. Leaves of the plant are mainly alternate but may appear to be opposite due to crowding.
|Purple Loosestrife||Lythrum salicaria||
Purple loosestrife or purple lythrum is a member of the Lythraceae or loosestrife family. The plant often sends up multiple stems that can range in height from 6 to 8 feet. The stems are four to eight sided and can either be smooth or pubescent. The erect stems are tough and often appear to be woody at the base of the plant. Leaves are simple, entire, and can be opposite or whorled. Purple loosestrife flowers are arranged on a spike that is from 2 inches to 3 feet long. Individual flowers have five to seven petals that arise from a cylindrical green tube.
|Saltcedar||Tamarix chinensis, T. parviflora, T. ramosissima||
Saltcedar, also referred to as tamarisk or tamarik, is a member of the Tamaricaaceae or tamarisk family. Saltcedar is a deciduous shrub or small tree that can grow from 5 to 30 feet tall. Trunks of the trees are slender upright, or branched, and covered with smooth reddish-brown bark that becomes ridged and furrowed with age. Leaves are deciduous, appressed, small, graygreen, and scalelike. Flowers are 5 petaled, pink to white in color, and crowded into numerous clusters on the end of twigs. Seeds are reddish-brown and extremely tiny.