General: Annual herb from a slender taproot; stems usually single, erect, 10-50 cm tall, branched above, short-hairy.
Leaves: Basal leaves soon deciduous; stem leaves 3-10 cm long, 1-2 cm wide, entire to saw-toothed or pinnately cut with toothed segments, reduced upwards, entire to lobed, not clasping, lower sometimes shallowly pinnately-cut, upper unstalked.
Flowers: Inflorescence ofnumerous, elongate racemes; flower stalks slightly ascending, 2-4 mm long, slightly flattened on lower surfaces, usually hairy on upper surfaces; petals lacking, rarely vestigial, white, to 1 mm; sepals about 1 mm long.
Fruits: Silicles, round to short egg-shaped, 3-3.5 by 2.5-3 mm long, tips slightly winged, abruptly curved into obtuse tee at the tips, shallowly slightly notched, glabrous to short-hairy; beaks lacking.
Notes: Four, sometimes difficult to distinguish, varieties occur in BC.
1. Silicles averaging 2.5 mm long, glabrous; flower stalks slightly flattened................. var. densiflorum
1. Silicles averaging 3 mm long, glabrous or short-hairy; flower stalks conspicuously flattened.
2. Silicles glabrous................ var. macrocarpum Mulligan2. Silicles short-hairy.
3. Silicles short-hairy on both surfaces..................... var. pubicarpum (A. Nelson) Thell.
3. Silicles short-hairy only on the margins.................... var. elongatum (Rydb.) Thell.
Dry disturbed areas and waste places in the steppe and montane zones; var. densiflorum - frequent throughout BC, var. elongatum - frequent in S and NW BC, var. macrocarpum - frequent in S and E BC, and var. pubicarpum - rare in SC BC; var. densiflorum - native from SE BC to MB, introduced elsewhere, var. elongatum - ranges N to YT and NT, var. macrocarpum - ranges E to SK, and var. pubicarpum - ranges S to VT and CA.
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
2020-12-05 12:22:06 AM
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