About Trifolium breweri S.Watson
Trifolium breweri S.Watson is a mat-forming perennial herb with an upright or decumbent growth form and dense, hairy foliage. Its leaves are cauline, each composed of three obovate leaflets that are typically 5 to 20 millimeters long, and leaflets may be either entire or serrated along the edges. The inflorescence is umbel-like, holding 5 to 15 flowers, and often grows oriented to one side. The small, bilaterally symmetrical flowers range in color from yellowish white to pink-lavender. Each flower has a five-lobed, hairy calyx, separate petals, and a papilionaceous corolla. The banner petal is lanceolate, the wing petals are narrow and oblanceolate to oblong, and the tips of both the wing petals and the keel are obtuse or rounded. Stamens are diadelphous: nine are joined together, and one is free. After pollination, a single-seeded fruit develops that protrudes out from the corolla. This plant is highly adaptive, thriving in mixed evergreen forests and coastal coniferous forests, and it can also survive in open areas and along roadsides. It occurs at elevations between 200 meters and 1800 meters. Trifolium breweri is distributed across most of western Oregon (original source note: transcribed error 'Eastern' retained as provided), southern Oregon, and California. It grows in the Klamath Range, Cascade Range, and Sierra Nevada.
