General:
Perennial herb from widespread rhizomes, sometimes with basal winter bulblets, stolons short and leafy or compact; stems erect, 15-75 cm tall, simple or branched above, glabrous or short stiff-hairy in lines.

Leaves:
Mostly opposite, spoon- to egg-shaped, 2.5-8 cm long, 1.2-3.5 cm wide, glandular-toothed, sharp-pointed, glabrous except for the (usually) minutely-hairy margins and midrib; stalks 1-3 mm long.

Flowers:
Inflorescence of 2 to 10 flowers in upper leaf axils, nodding in bud, densely glandular and short stiff-hairy; hypanthium cup-shaped, 1.2-3 mm long; petals shallowly heart-shaped,12-22 mm long, yellow or cream, wavy-margined, notched at tip; sepals linear-lanceolate,10-12 mm long, densely glandular; anthers 2.2-3 mm long; ovaries 2-3.5 cm long, densely glandular; styles usually noticeably longer than petals; stigmas 4-lobed, the lobes 2 mm long, oblong egg-shaped.

Fruits:
Capsules, erect, linear, 4-8 cm long, glandular-hairy; stalks 10-22 mm long, glandular- and minutely-hairy; seeds 1-1.2 mm long, netted, tuft of hairs rust-colored, 6.5-8 mm long, persisting.

Notes:
Hybrids occur rarely between this species and others in BC. They resemble E. luteum with pink petals greater than 1 cm long. Hybrids between E. luteum and E. ciliatum ssp. glandulosum have been called E. x treleasianum Lev.

Source:  The Illustrated Flora of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia

Synonyms and Alternate Names:
Epilobium treleaseanum Levl. p.p.