General:
Annual herb from a fibrous root; stems usually prostrate, freely branched with milky juice, 5-30 cm long.

Leaves:
Obliquely oblong to more oblong egg-shaped, toothed near the tip, 5-15 mm long; stipules at the base lanceolate, irregularly margined, 0.5-1.5 mm long.

Flowers:
Inflorescence of small clusters of axillary involucres; involucres 1 mm long, bell-shaped; glands 4, with sunken centres, appendages whitish, lobed or small-toothed.

Fruits:
Capsules, 1.5-2 mm long, glabrous; seeds 1.2 mm long, greyish-brown, sticky when wet, pitted to wrinkled or cross-corrugated.

Source:  The Illustrated Flora of British Columbia