Trifolium gymnocarpon is a small perennial herb with stems spreading along the ground to form a flat mat or clump. The leaves are each made up of 3 to 5 thick, hairy leaflets with serrated edges. The inflorescence is an umbel of flowers spreading out or flexing downward. The flower is roughly a centimeter long and dull pink or brownish in color.
- Trifolium gymnocarpon ssp. plummerae — Plummer's clover, an Endangered species within California, but the subspecies is apparently secure, considering populations outside California.<ref>California Native Plant Society, Inventory of Rare and Endangered Plants (online edition, v8-02): Trifolium gymnocarpon ssp. plummerae . accessed 2.28.2016.</ref>
- Calflora Database: Trifolium gymnocarpon (Hollyleaf clover)
- Jepson Manual eFlora (TJM2) treatment of Trifolium gymnocarpon ssp. plummerae
- Southwest Colorado Wildflowers
- UC CalPhotos gallery: Trifolium gymnocarpon ssp. plummerae