Potentilla breweri
Potentilla breweri is a species of Potentilla known by the common name Brewer's cinquefoil.
It is native to western North America, with populations scattered from southern Washington to south-central California and from the Pacific cordillera inland to the mountains of the Great Basin. Its greatest population density occurs in the Sierra Nevada, the high Cascade Ranges, and Steens Mountain.
Description
P. breweri is a herbaceous perennial or near-subshrub growing from a sturdy, branched caudex. Its leaves are pinnately compound and covered in soft, tangled, woolly hairs, giving them a more or less silver-blue color. The exact shape of the leaf and the degree of hairiness can vary substantially between early-season leaves and those produced later in the year. The inflorescences are cymose and usually bear 2-15 flowers. Like most Potentilla species, its flowers have five bright yellow petals, 15 stamens, and numerous separate pistils, and are adapted for generalist pollination. Each flower produces a cluster of achenes if successfully pollinated.It is a taxonomically difficult species that appears to hybridize frequently with other Potentilla spp. The boundaries of the resulting species complex are poorly-understood.