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Biennial or short-lived perennial herb from a simple or branched stem-base; stems 1-several, simple or branched, 0.3-1.0 m tall, glabrous above, more or less hairy toward base.
Basal leaves numerous in a rosette, oblanceolate, entire, 2-3 cm long, 1.5-2.5 mm wide, gradually narrowed to a slender, fringed stalk; stem leaves unstalked, ear-like at the bases, lanceolate, entire or remotely toothed, 1.5-2.0 cm long, 2-3 mm wide, glabrous to sparsely hairy.
Racemes many-flowered, symmetric; petals 6-10 mm long, white to purple; sepals slightly bulging on one side at the base.
Siliques, directed at right angles from the axis of the inflorescence or slightly upward, but the siliques curved downward, 5-7 cm long, 2 mm wide; seeds 1.5-2 mm long, with very narrow wings.
Mulligan (1995) separates A. columbiana from A. sparsiflora based on stem and base leaves with either 2- and 3-branched hairs on the latter or 3- and 4-branched hairs on the former; a rather minor difference.
Source: The Illustrated Flora of British Columbia