It is native to western North America from southern Alaska and British Columbia to California, Montana, Arizona, and Baja California, where it occurs in many types of habitat, becoming common to abundant in some regions. It can grow in disturbed habitat and become a casual roadside weed.
Trifolium microcephalum is an annual herb taking a decumbent or erect form. It is coated in hairs. The leaves are made up of oval leaflets with notched tips, each measuring up to 2 centimeters long, and bristle-tipped stipules.
The inflorescence is a head of flowers borne in a bowl-like involucre of wide, hairy bracts. The head is not more than a centimeter wide. Each flower has a calyx of sepals with lobes narrowing into hairy bristles. The flower corolla is pinkish or purplish and measures 4 to 7 millimeters in length.
- Calflora Database: Trifolium microcephalum (Hairy clover, Maiden clover, Small headed clover)
- Jepson Manual eFlora (TJM2) treatment of Trifolium microcephalum
- Burke Museum, University of Washington
- UC CalPhotos gallery: Trifolium microcephalum[[Category:Natural history of the Transverse Ranges]
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