White Flowered Forbs

White Flowered Forbs
African rue
Broadleaved pepperweed
Field bindweed
Hary whitetop
Horehound
Lens-podded hoarycress
Onionweed
Oxeye daisy
Poison hemlock
White clover
White sweetclover
Whitetop

 

Broadleaved Pepperweed
Lepidium latifolium L. (Mustard family, Brassicaceae)
 

Description

Erect perennial forb 1 to 6-1/2 feet tall, with white flowers and extensively creeping roots; plants are highly competitive and typically form dense colonies that displace native vegetation.

Leaves: Root crown and lower stems weakly woody; bright green to gray-green foliage is glabrous; leaves are alternate, lanceolate to elliptic or oblong in shape; basal leaves to 12 inches long and 3-3/16 inches wide, with serrate margins and on long stalks 1-3/16 to 5-7/8 inches long; stem leaves reduced, sessile, tapered at the base, margins entire to weakly serrate.

Flowers: Flowers May to September; flowering inflorescences pyramidal to rounded on top; 4 spoon-shaped petalled flowers are white and in dense clusters; less than 1/16 inch long; sepals oval, also less than 1/16 inch long, covered with long simple hairs; stamens 6, 4 long and 2 short.

Fruit: Pods (silicles), 2-chambered, round to slightly ovate, slightly flattened, lacking a notch at the apex, 1/16 inch long, covered with long simple hairs; stigma sessile, persistent with the pod; stalks much longer than pods, glabrous or sparsely pubescent; seeds 2 per fruit, ellipsoid, slightly flattened, less than 1/16 inch long or wide; reddish-brown, with a shallow groove on each side and minutely granular surface.

Habitat

Cultivated and disturbed or degraded moist open sites in meadows, grassland, woodland, forest, and riparian communities, and roadsides within elevations that generally range from 4,100 to 7,900 feet.

Propagation/Phenology

Reproduces vegetatively from vigorously creeping long, thick roots, root fragments and by seed; plants usually produce abundant, often highly viable seed.

Comments

Native to Eurasia; heavy infestations of broadleaved pepperweed are difficult to control; roots do not hold soil together very well, allowing erosion of riverbanks and streambanks. New Mexico Class B noxious weed.

Collage of images of Bradleaved pepperweed

 

 
Forest Service Shield
Invasive plants and weeds of the national forests and grasslands in the southwestern region
Broadleaved pepperweed flowers Broadleaved pepperweed plants Broadleaved peppeweed roots Broadleaved pepperweed foliage