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General:
Annual herb from a fibrous root; stems prostrate, freely branched, often mat-forming, glabrous, with milky juice, 5-40 cm long.
Leaves:
Stem leaves opposite, lanceolate to oblong, 5-15 mm long, scalloped-toothed to entire, stipules linear, segmented unequally, 1 mm long.
Flowers:
Inflorescence of several involucres solitary in leaf-axils; involucres axillary, top-shaped, 1 mm long; glands 5, 4 pinkish and depressed in the centre with whitish appendages, the fifth a short fringed lobe.
Fruits:
Capsules, glabrous, 1.5 mm long; seeds 1.2 mm long, greyish, somewhat prismatic, coarsely wrinkled with transverse corrugations, mucilaginous when wet.
Source: The Illustrated Flora of British Columbia
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