It is native to the Great Basin region of the western United States, from Washington to northern California, and Nevada to Idaho. It occurs in several types of habitat, including sagebrush scrub, juniper woodland, yellow pine forest, and mountain woodlands.
Trifolium macrocephalum is a rhizomatous perennial herb taking an upright form. The herbage is hairy. The leaves are made up of 5 to 9 thick oval leaflets each measuring up to 2.5 centimeters in length.
The inflorescence is crowded, egg-shaped and up to 5 or 6 centimeters long. Each flower has a calyx of sepals with lobes narrowing into bristles which are coated in long woolly hairs. The flower corolla may be nearly 3 centimeters in length and is pink in color, or sometimes bicolored.
- Media related to Trifolium macrocephalum at Wikimedia Commons
- Calflora Database: Trifolium macrocephalum (Big headed clover, Largehead clover)
- Jepson Manual eFlora (TJM2) treatment of Trifolium macrocephalum[permanent dead link]
- Washington Burke Museum
- UC CalPhotos gallery: Trifolium macrocephalum
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