Distribution: Occurring west of the Cascades crest, where endemic to the Olympic Mountains.
Habitat: Rocky cliffs and talus slopes at middle to high elevations.
Flowers: July-September
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Bees
Densely-tufted, prostrate sub-shrub, the flowering stalks 1-5 cm. tall, with several bract-like leaves.
Leaves oblanceolate to spatulate-obovate, 10-20 mm. long and 2-6 mm. wide, 3-nerved, with silky hairs.
Inflorescence a tight raceme, 2-4 cm. long; calyx hemispheric, the 5 lobes oblong, reflexed, 2 mm. long; petals 5, white, oblong to oblong-obovate, 2-2.5 mm. long; stamens 35-40, pistils 5, the styles short, stout, hairy.
Fruit a follicle, barely 2 mm. long.
PNW Herbaria: Specimen records of Petrophytum hendersonii in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Petrophytum hendersonii checklist entry
OregonFlora: Petrophytum hendersonii information
E-Flora BC: Petrophytum hendersonii atlas page
CalPhotos: Petrophytum hendersonii photos