Ivesia arizonica
Ivesia arizonica var. arizonica
purpusia, rock whitefeather
Arizona whitefeather, yellow ivesia, yellow purpusia
pendent or prostrate to ascending, (0.2–)0.5–1.6(–3) dm.
planar, 2–15(–20) cm; sheathing base usually not strigose abaxially;
petiole 3–10 cm;
lateral leaflets (2–)3–4(–5) per side, separate, broadly ovate or obovate to orbiculate, (2–)5–15(–18) mm, incised 1/4–3/4 to base into (3–)7–11 ± ovate teeth, apex not setose, surfaces ± sparsely short-pilose, ± glandular;
terminal leaflets ± distinct.
1–3;
blade well developed.
(1–)5–30(–150)-flowered, open, 0.5–14 cm diam.
1–20(–60)-flowered, 0.5–7 cm diam.
5–30 mm.
6–12 mm diam.;
epicalyx bractlets 0(–3), lanceolate, 0.9–1.8 mm;
hypanthium turbinate or campanulate, 1.5–3(–5) × 1–3(–4) mm;
sepals 2–4(–5) mm, acute;
petals yellow or white, oblanceolate to elliptic or obovate, (1.6–)2–4 mm;
stamens 5, filaments 0.8–1.3 mm, anthers ± yellow, oblong to narrowly ovate, 0.6–1.5 mm;
carpels (2–)6–10(–13), atop a stipelike torus, styles 0.9–1.8 mm.
hypanthium campanulate, ± as deep as wide;
petals yellow;
anthers 0.6–1 mm.
greenish white to light tan, 1.2–2 mm, faintly rugose, ± carunculate.
Ivesia arizonica
Ivesia arizonica var. arizonica
Varieties 2 (2 in the flora).
Because the epithet saxosa was retained for Potentilla saxosa upon transfer to Ivesia, a different epithet (arizonica) was needed when Purpusia was likewise transferred in the same publication (B. Ertter 1989). The correct name for this species in Potentilla is P. osterhoutii (A. Nelson) J. T. Howell, due to the existence of P. arizonica.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Variety arizonica occurs as isolated populations from the Funeral and Grapevine mountains, Inyo County, California, to the Kolob Plateau of Washington County, Utah, and on the walls of the Grand Canyon and in the Oak Creek Canyon area of northern Arizona. Significant variation in vestiture, hypanthium depth, and other features occurs among these widely scattered population clusters. High-elevation plants (3100–3400 m) from the Troy Peak area of the Grant Range in northeastern Nye County, Nevada, are notably depauperate (0.2–0.5 dm) with leaflets 2–5 mm and petals 1.6–2.5 mm. All other populations occur below 2400 m.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Petals yellow; hypanthia campanulate. | var. arizonica |
1. Petals white; hypanthia turbinate. | var. saxosa |
CalFlora
WildflowerSearch
iNaturalist
USDA Plants Database
