[Wikipedia] Subspecies: There are also leaves on the flower stem which may be similar in shape or may be rounded or squared and sometimes fuse together to create a bowl around the stem. The largest flowers, up to 1 cm in diameter, are found in Claytonia parviflora subsp. grandiflora, which is a subspecies endemic to the foothills and lower slopes of the western Sierra Nevada of North America.[1] Together with Claytonia perfoliata and Claytonia rubra, Claytonia parviflora comprises what is almost certainly a polyploid pillar complex. There are four well-defined subspecies of Claytonia parviflora: Claytonia parviflora subsp. grandiflora, Claytonia parviflora subsp. parviflora, Claytonia parviflora subsp. utahensis, and Claytonia parviflora subsp. viridis.[3] (link added by Mary Ann Machi)