White marsh-marigold or mountain marsh-marigold is an early bloomer on local mountains (this photograph is from June 26). Other plants in flower at the time on Mt. Cheam included violets, Erythronium grandiflorum, Phlox diffusa, Potentilla flabellifolia and Saxifraga oppositifolia. In British Columbia, this taxon is found at elevations ranging from 1300-1900m, with a preference for a southern exposure.
Caltha leptosepala var. leptosepala is one of two varieties recognized in E-Flora BC. The other is Caltha leptosepala var. biflora. However, the Flora of North America lumps the two together as Caltha leptosepala, and describes the taxon as “morphologically complex”.
Intriguingly, this is one of the few members of the buttercup family that has a historical use of being eaten raw (most members of the family are poisonous). Plants of Coastal British Columbia notes that “the leaves and flower buds were eaten raw or cooked by Alaskan native people”. The book also makes mention of the roots being boiled and appearing like sauerkraut (no mention of taste is given).