UW Burke Herbarium species comparison

Cauline leaves numerous, over-lapping, needle-like, 10-20 mm. long, their tips spreading.

Leaves linear, 1-nerved, 0.5-8 cm. long, the basal ones with bundles of secondary leaves in their axils.

Flowers several in a congested cluster, the pedicels about 2 mm. long;

sepals 5, lanceolate, pointed, glabrous, 1-nerved, scarious-margined, 5-12 mm. long;

petals 5, white, narrowly oblanceolate, often shorter than the sepals;

stamens 10;

styles 3.

Flowers several to many, usually congested in a head-like cluster, occasionally more open;

sepals 5, 1-nerved, broadly scarious-margined, thickened on the back at the base, 3-6 mm. long;

petals 5, white, half again as long as the sepals;

stamens 10;

styles 3.

Capsule half as long as the sepals, opening by 6 teeth.

Capsule equaling the sepals, firm-walled, opening by 6 teeth.