Parry’s or Chamise horkelia

Potentilla parryi (Greene) Greene

Plants forming open mats. Stems ascending to erect, 1–3(–3.5) dm. Basal leaves 4–10(–12) × 1–2 cm; leaflets 3–6(or 7) per side, narrowly obovate, 5–12(–15) × 4–8(–10) mm, 1/2–3/4 as wide as long, divided ± 1/4 to midrib into 5–10 oblong to broadly obovate teeth, sparsely pilose especially on midveins and margins. Cauline leaves 1–4. Pedicels (3–)5–15 mm. Flowers 15 mm diam.; epicalyx bractlets linear-lanceolate to narrowly elliptic, 2–5 × 0.5–1.5 mm, ± 2/3 length of sepals; hypanthium 0.6–1 × 2.5–4 mm, less than 1/3 as deep as wide; sepals ± spreading to reflexed, lanceolate to narrowly elliptic, 3.5–6 mm; petals elliptic to obovate, 4–7 × 3 mm, apex obtuse to rounded to truncate or slightly emarginate; filaments 1–3 × 0.6–1.3 mm, anthers 0.6–1 mm; carpels (17–)20–50; styles 1.5–2.5 mm. Achenes grayish, 1.3–1.5 mm, finely reticulate. 2n = 28.

Flowering late spring–early summer. Chaparral, pine-oak woodlands, primarily on Ione Formation, rarely on schist or limestone; of conservation concern; 80–900 m; Calif.

Horkelia parryi is known from the foothills of the western Sierra Nevada in Amador, Calaveras, and El Dorado counties, and is disjunct in Mariposa County.