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FNA | Family List | FNA Vol. 9 | Rosaceae | Ivesia

1. Ivesia saxosa (Lemmon ex Greene) Ertter, Syst. Bot. 14: 232. 1989.

Rock ivesia

Potentilla saxosa Lemmon ex Greene, Pittonia 1: 171. 1888; P. acuminata H. M. Hall; P. saxosa subsp. sierrae Munz

Plants green, ± tufted, often forming hanging clumps, sometimes rosetted. Stems pendent or prostrate to ascending, 0.4–2.6(–3) dm. Basal leaves planar, 2–15 cm; sheathing base not strigose abaxially; petiole 3–9 cm; lateral leaflets (1–)2–4(–7) per side, separate to slightly overlapping, obovate to orbiculate or flabellate, (3–)5–15(–22) mm, incised 1/4–3/4 to base into 5–15 broadly ovate teeth or oblanceolate lobes, sometimes also medially split to base (Kern Plateau), apex not setose, surfaces ± sparsely short-pilose, prominently glandular; terminal leaflets ± distinct. Cauline leaves 1–2(–4); blade well developed. Inflorescences (1–)3–30(–60)-flowered, open, (0.5–)2–8 cm diam. Pedicels (5–)10–30 mm. Flowers 6–12 mm diam.; epicalyx bractlets 5, broadly lanceolate to oblong, 1–2.5 mm; hypanthium patelliform, 0.5–1.5 × 2–4(–4.5) mm; sepals 2–4.5 mm, acute; petals yellow, oblanceolate to obovate, (1.5–)2–4 mm; stamens 15–35(–40), filaments 0.3–1 mm, anthers yellow, subrotund, 0.2–0.3(–0.5) mm; carpels (3–)10–20(–40), styles 1–2 mm. Achenes greenish white to light tan, 1–1.8 mm, faintly rugose, ± carunculate.

Flowering late spring–summer. Dry, rocky outcrops of granitic or volcanic origin, usually crevices of more or less vertical protected cliffs or boulders, mainly in oak and conifer woodlands; 900–3300 m; Calif.; Mexico (Baja California).

Ivesia saxosa is encountered in the foothills and mountains of southeastern California from the White Mountains and adjacent eastern slopes of the Sierra Nevada of Mono County to the Transverse Ranges (including the Little San Bernardino Mountains) of Kern and San Bernardino counties. Populations on the Kern Plateau tend to have more dissected leaflets and may deserve recognition as a distinct variety. On the Peninsular Ranges, I. saxosa occurs in Riverside and San Diego counties and into northern Baja California, Mexico, as far south as the western slopes of the Sierra Juárez and Sierra San Pedro Mártir.


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