Page author: David Giblin
Lepidium densiflorum
common peppergrass, elongate peppergrass, hairy-fruited peppergrass, large-fruited peppergrass, prairie peppergrass

Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.

Habitat: Dry, open areas.

Flowers: April-June

Origin: Native

Growth Duration: Annual, Biennial

Conservation Status: Not of concern


Pubescent annual, the stem usually freely-branched, 2.5-5 dm. tall.


Basal leaves in a rosette, 3-10 cm. long and 1-2 cm. wide, from simply serrate to pinnatifid with toothed segments, usually deciduous before flowering; cauline leaves alternate, reduced, mostly entire to toothed, linear.


Inflorescence of numerous, elongate, bractless racemes; pedicles about equal to the fruits, spreading; sepals 4, 1 mm. long; petals usually absent; stamens 2; style lacking.


Silicles obovate-oblong, strongly obcompressed, 2-3.5 mm. long, the tip slightly winged, slightly notched, glabrous to puberulent.

Accepted Name:
Lepidium densiflorum Schrad.
Publication: Index Seminum (Göttingen). 1832: 4. 1832.

Synonyms & Misapplications:
Lepidium densiflorum Schrad. var. densiflorum [HC, Rollins 1993a]
Lepidium densiflorum Schrad. var. elongatum (Rydb.) Thell. [HC, Rollins 1993a]
Lepidium densiflorum Schrad. var. macrocarpum G.A. Mulligan [HC, Rollins 1993a]
Lepidium densiflorum Schrad. var. pubicarpum (A. Nelson) Thell. [HC, Rollins 1993a]
Lepidium elongatum Rydb.
Lepidium neglectum Thell.
Lepidium pubicarpum A. Nelson
Additional Resources:

PNW Herbaria: Specimen records of Lepidium densiflorum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Lepidium densiflorum checklist entry.

E-Flora BC: Lepidium densiflorum atlas page.

CalPhotos: Lepidium densiflorum photos.

USDA Plants: Lepidium densiflorum information.

17 photographs:
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