(Calder & R. L. Taylor) Keener, Castanea. 45: 278. 1980.
Calder & R. L. Taylor, Madroño 17: 70. 1963
Stem 10-35 cm, strongly rhizomatous; roots fibrous. Leaves abaxially glabrous; leaflets irregularly 2-3-lobed, lobes often with 1-3 secondary lobes; apex rounded, with shallow glandular notches. Inflorescences axillary, flowers solitary or occasionally in loose 2-flowered leafy cymes; peduncle not strongly clavate. Flowers: sepals (10-)12.6-15(-16.8) × (6.9-)8.2-10.2(-11.2) mm; stamens 40-60; filaments filiform to club-shaped, 5-8 mm. Follicles sessile, upright to widely divergent; body oblong, 11-15 mm, abruptly contracted into style beak; beak 0.8-1.7 mm. Seeds 2-2.5 mm, glabrous. 2 n = 14.
Flowering spring. Moist, shady, rocky crevices and talus slopes; 100-1000 m; B.C.
This distinctive species was discovered in 1957 on the Queen Charlotte Islands and was thought to be endemic to those islands. Subsequently it has been found on the Brooks Peninsula on the west coast of Vancouver Island and on Porcher Island, south of Prince Rupert (T. C. Brayshaw 1989).