Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Flowers: March-June
Origin: Introduced from Eurasia
Growth Duration: Annual, Biennial
Conservation Status: Not of concern
Pollination: Bumblebees, bees, flies, beetles, wasps
Annual herb with simple or branched stems 20-60 cm tall.
Alternate; lower leaves deeply pinnately dissected or compound; upper leaves simple and strongly clasping the stem.
Yellow, small, with 4 petals; in elongate racemes at ends of stems.
Small ovate capsules (silicles) to 4 mm long.
Look for the dissected lower leaves, strongly clasping (seemingly perfoliate) upper leaves, small yellow flowers with 4 petals, and small ovate silicles.
Publication: Sp. Pl. 2: 643. 1753.
PNW Herbaria: Specimen records of Lepidium perfoliatum in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Lepidium perfoliatum checklist entry
OregonFlora: Lepidium perfoliatum information
E-Flora BC: Lepidium perfoliatum atlas page
CalPhotos: Lepidium perfoliatum photos
