29. Ivesia sabulosa (M. E. Jones) D. D. Keck, Lloydia. 1: 124. 1938[1939].
Sevier ivesia, yellow comarella
Potentilla sabulosa M. E. Jones, Proc. Calif. Acad. Sci., ser. 2, 5: 680. 1895; Comarella sabulosa (M. E. Jones) Rydberg
Plants ± grayish green. Stems ascending to erect, (1.8–)2–6(–6.5) dm. Basal leaves 7–25(–30) cm; sheathing base usually sparsely strigose abaxially; petiole 1–4(–5) cm; leaflets 15–40 per side, ± flabellate, 3–14 mm, usually incised to base into 2–3 oblanceolate lobes, ± densely short-hirsute to -villous. Inflorescences 10–60-flowered, 4–15 cm diam. Pedicels (1–)5–20 mm. Flowers 9–14 mm diam.; epicalyx bractlets lanceolate, 1–3(–3.3) mm; hypanthium interior golden, 1–2 × 3–5 mm; sepals (2.5–)3.5–6 mm, base golden adaxially, apex acute to acuminate; petals yellow, linear to narrowly oblanceolate, 2–4 mm; stamens 5, filaments 2–4 mm, anthers yellow, sometimes red-rimmed, oblong, 0.6–1.2 mm; carpels 1–5, styles 2–3 mm. Achenes brown, 1.7–2.2 mm.
Flowering summer. Dry flats and slopes, on gravelly volcanic or limestone soil, in sagebrush and other desert shrub communities, montane conifer woodlands; of conservation concern; 1500–2700 m; Ariz., Nev., Utah.
Ivesia sabulosa occurs from central Nevada and southwestern Utah south to Arizona north of the Grand Canyon.