Barton Flats or Wilder’s horkelia

Potentilla parryi (Greene) Greene var. wilderae (Parish) Jepson; P. wilderae (Parish) Munz & I. M. Johnston

Plants forming rosettes. Stems prostrate to decumbent, (0.5–)1–2.5 dm. Basal leaves (3–)4–8(–10) × 0.8–1.8 cm; leaflets (3 or)4–7 per side, narrowly to broadly obovate, 3–10 × 3–10 mm, ± as wide as long, divided 1/2–3/4 to midrib into 5–15 narrowly oblong teeth or lobes, pilose especially on midveins and margins. Cauline leaves (0–)1(–2). Pedicels 3–15 mm. Flowers 5 mm diam.; epicalyx bractlets lanceolate to ovate, 0.8–1.7 × 0.3–0.7 mm, 1/2–2/3 length of sepals; hypanthium 1–1.5 × 1.5–3 mm, ± 1/2 as deep as wide; sepals reflexed, broadly elliptic to broadly ovate, 1.7–2.5 mm; petals oblanceolate to oblong, 2–3 × 1–2 mm, apex rounded; filaments 0.5–1 × 0.3–0.8 mm, anthers 0.4–0.5 mm; carpels 3 or 4; styles 1–2 mm. Achenes tan, 1.8–2.2 mm, coarsely rugose.

Flowering summer. Chaparral flats, hills, adjacent to montane conifer woodlands; of conservation concern; 1900–3000 m; Calif.

Horkelia wilderae is known from the Barton Flats area of the eastern San Bernardino Mountains, San Bernardino County.

Some morphological characteristics (small flowers, reflexed sepals) may indicate a closer relation to Horkelia fusca than to H. parryi.