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Growing in a poor fen on moist microsites on peat hummocks in full sun. About 40-50 individuals in an ~1/10 of an acre area. Most individuals in full flower, and a few with flowers starting to wither. With Dasiphora floribunda, Ledum decumbens, Festuca altaica, Equisetum fluviatile, Carex limosa, C. gynocrates, Betula nana, Myrica gale, Linnaea borealis, Picea mariana (dwarf), Trichophorum alpinum, Oxycoccus microcarpus, Platanthera dilatatum, P. huronesis, Arctous rubra, Drosera rotundifolia, and Triantha glutinosa.

Wickersham Dome. Rare. Blossoms very infrequently. Fred Case saw one of the plants while visiting Fairbanks and suggested it was C. yattabeanum, but he did not see it in flower, so he could not be certain. I saw it in blossom once and it was not C. guttatum or C. passerinum.

See Paul Kiesling on C. yattbeanum in Vol 39, No 1, p 11 (1981) of the Bulletin of the American Rock Garden Society for description of habitat, i.e., full sun.