King devil hawkweed (Hieracium piloselloides)
King devil hawkweed (Hieracium piloselloides)
King devil hawkweed (Hieracium piloselloides)
King devil hawkweed (Hieracium piloselloides)

Other common names
Tall hawkweed, Yellow king devil hawkweed

Description
Perennial, flowers June to July in lower elevations. Grows 10 to 36 inches tall. Leaves are hairy, spatula- shaped and almost exclusively basal. Flower heads are clustered, yellow and number up to 30 per plant. Extensive stolons form dense mats of vegetation. King devil hawkweed, Yellow hawkweed and Meadow hawkweed are all very similar and difficult to classify...

Kochia (Kochia scoparia)
Kochia (Kochia scoparia)

Other common names
Fire weed, Mexican fire weed

Description
Annual, blooms July to October. Grows one to six feet tall. Stems are many-branched, round, slender and often red-tinged. Leaves are one-half to two inches long, alternate, and lance-shaped with margins fringed with hairs. Leaf blades have three or five prominent veins. Flowers are inconspicuous in spikes in the axils of upper leaves.

Impacts...

Kudzu (Pueraria lobata)
Kudzu (Pueraria lobata)
Kudzu (Pueraria lobata)
Kudzu (Pueraria lobata)

Description
This high-climbing vine often completely covers trees, shrubs and man-made structures forming “kudzu sculptures." The leaves are alternate, six to eight inches long, have fuzzy leaflets three to four inches long, and are oval, lobed or nearly heart-shaped. Flowers are large-hanging clusters of pea-like blooms, purple to red in color, with a grape-like smell, appearing in midsummer. Fruit is dark brown, flattened pods in clusters, very hairy...

Leafy spurge (Euphorbia esula)
Leafy spurge (Euphorbia esula)
Leafy spurge (Euphorbia esula)
Leafy spurge (Euphorbia esula)

Other common names
Wolf's milk, Faitour's grass, Hungarian spurge

Description
Aggressive perennial herb that grows upright, branching, and reaches two to three feet tall, with tough woody stems that exude milky white latex sap when broken. It has alternate, narrow leaves, which are somewhat frosted and slightly wavy along the margins. The flowers of this weed are very small and are borne in greenish-yellow structures...

Lens podded white top (Cardaria chalapensis)
Lens podded white top (Cardaria chalapensis)
Lens podded white top (Cardaria chalapensis)

Description
Single-stemmed, erect, perennial herb. Grows less than knee-high. Flowers are generally dense, white, and typically flat-topped. Leaves are shaped like a lance, up to four inches long and one inch wide, clasp the stem and have a heart-shaped base. The infestation of this species is distinguishable by large white patches in fields.

Impacts
This very invasive weed forms dense patches that can completely dominate meadows and...

Lesser celandine (Ranunculus ficaria)
Lesser celandine (Ranunculus ficaria)
Lesser celandine (Ranunculus ficaria)
Lesser celandine (Ranunculus ficaria)

Other common names
Fig buttercup, Bulbous buttercup, Small crowfoot

Description
An herbaceous, perennial plant with a basal rosette of dark-green, shiny, stalked leaves that are kidney- to heart-shaped. The flowers open in March and April, have eight glossy, butter-yellow petals, and are borne singly on delicate stalks that rise above the leaves. Pale-colored bulblets are produced along the stems of the above-ground portions of the...

Matgrass (Nardus stricta)
Matgrass (Nardus stricta)
Matgrass (Nardus stricta)
Matgrass (Nardus stricta)

Description
Slow-growing, perennial bunchgrass that is densely tufted and long-lived. It produces unbranched flower-spikes that carry the single-flowered spikelets along one side only. Leaves are hard and bristle-like, bluish green and up to 1/4 inch wide, appearing narrower because blades are tightly folded along the mid-rib. Stems are tipped by inconspicuous spikes that bear all spikelets on one side of the stems and grow up to eight inches tall. This grass is...

Meadow hawkweed (Hieracium pratense)
Meadow hawkweed (Hieracium pratense)
Meadow hawkweed (Hieracium pratense)
Meadow hawkweed (Hieracium pratense)

Description
Stems and leaves exude milky juice when broken. Stems are bristly and usually leafless, although occasionally a small leaf appears near the midpoint. Stems can reach three feet tall and bear up to 30 half-inch flowerheads near the top. Flowers are yellow and appear May to July, depending on elevation.

Impacts
Plants of the hawkweed complex produce mats of rosettes preventing desirable plants from establishing or surviving...

Meadow knapweed (Centaurea pratensis)
Meadow knapweed (Centaurea pratensis)
Meadow knapweed (Centaurea pratensis)
Meadow knapweed (Centaurea pratensis)

Description
Blooms in midsummer to fall. It grows from a woody root crown, up to 3 1/2 feet tall. The lower leaves are long-stalked; the upper leaves have no stalk. Stems are many-branched and tipped by a solitary flower head up to one inch wide. Flower heads are pink to reddish-purple, oval or almost globe-shaped. A key identifying feature is the fringed bracts on the flower head. This species is a hybrid of black and brown knapweeds. Its foliage is coarse and...

Mediterranean sage (Salvia aethiopis)
Mediterranean sage (Salvia aethiopis)
Mediterranean sage (Salvia aethiopis)
Mediterranean sage (Salvia aethiopis)

Description
Biennial, blooms June to July. Grows two to three feet tall. Large, grayish rosette has a stout taproot. Flowers are one-half to one inch long, yellowish-white, forming woolly clusters in profusely-branched arrangement. Reproduces from prolific seed source. The leaves of the plant have a pungent aroma when crushed.

Impacts
Though not as dominant in range as many other weed species, Mediterranean sage is still a...