Horkelia argyrocoma Rydberg, Monogr. N. Amer. Potentilleae, 144, plate 84. 1898; Potentilla argyrocoma (Rydberg) Jepson

Varieties 2 (1 in the flora): California, nw Mexico.

Plants from the central Sierra San Pedro Mártir in northern Baja California belong to var. moranii Ertter & Reveal, which may be distinguished by its compact stature (to 0.5 dm), densely villous basal stipules 2–4 mm, decumbent stems 2–7 cm that are stipitate-glandular under the villous indumentum, and solitary, loosely congested cyme. The petals are oblanceolate to narrowly obovate and 2.5–3.5 mm. The grayish, faintly mottled achenes are 1.3–2 mm.

Lower Taxon

• Ivesia argyrocoma var. argyrocoma