1. Stamens 2-5; sepals glabrous to moderately glandular-hairy.

2. Leaves blunt; seeds usually wing-margined, 0.8-1.1 mm long...........S. canadensis

2. Leaves abruptly slender-pointed; seeds wingless, 0.6-0.9 mm long............... S. salina


1. Stamens 6-10; sepals densely glandular-hairy.

3. Seeds dark reddish-brown, nearly smooth, usually surrounded with a thin, white or brownish wing; sepals 5-9 mm long; plants native perennials............. S. macrotheca

3. Seeds light or dark brown or greyish-brown, finely reticulate and pimply, wingless; sepals 3.5-5 mm long, or less; plants introduced annuals or short-lived perennials.................... S. rubra


Source: Illustrated Flora of British Columbia