in N. L. Britton et al., N. Amer. Fl. 22: 254. 1908.
Shrubs 3–6 dm diam. Leaves light green to grayish green, becoming brownish, marcescent, hardened. Flowers: sepals persistent, inflating radially with fruit maturity. Follicles brown, coriaceous, opening first along adaxial suture, later on abaxial suture. 2n = 18.
Phenology: Flowering Apr–Aug.
Habitat: Cracks of limestone rock outcrops
Elevation: 1800–3500 m
Idaho, Mont., Wyo.
Kelseya uniflora can form dense carpets or mats that may cover areas of cliff faces. The solitary flower is unique in Spiraeeae. This species is of interest as an unusual rock-garden plant; it is difficult to cultivate.
"dm" is not declared as a valid unit of measurement for this property.