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Dwarf shrub, mat-forming; stems stiff, ascending, 5-30 cm tall, nearly completely concealed by the leaves, about 4 mm wide including appressed leaves, glabrous or finely hairy.
Evergreen, opposite, distinctly in 4 rows, appressed, egg- to lance-shaped, 2-5 mm long, rounded on the back, grooved only at the extreme base, glabrous or fringed with minutely glandular tiny hairs or longer chaff-like, early deciduous, white hairs; unstalked.
Solitary in leaf axils, usually several near the branch tips, nodding on glabrous or short-hairy stalks 5-30 mm long; corollas white, bell-shaped, 6-8 mm long, the lobes egg-shaped and about 1/3 the length of the tube; calyces reddish, egg-shaped, 2.5-3 mm long, entire to irregular-toothed; stamens not enlarged at the base.
Capsules, nearly globe-shaped, about 4 mm wide.
BC material is var. mertensiana, although some is transitional to the more southern var. gracilis (Piper) C.L. Hitchc.
Source: The Illustrated Flora of British Columbia