General:
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.

Leaves:
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.

Flowers:
Racemes many-flowered, symmetric; petals 6-10 mm long, white to purple; sepals slightly bulging on one side at the base.

Fruits:
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.

Notes:
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

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia

Synonyms and Alternate Names:
Arabis campyloloba Greene
Arabis peramoena Greene
Arabis polytricha Greene
Arabis sparsiflora Nutt.