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purpusia, rock whitefeather

Habit Plants green, ± tufted, often forming hanging clumps, sometimes rosetted.
Stems

pendent or prostrate to ascending, (0.2–)0.5–1.6(–3) dm.

Basal leaves

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.

Cauline leaves

1–3;

blade well developed.

Inflorescences

(1–)5–30(–150)-flowered, open, 0.5–14 cm diam.

Pedicels

5–30 mm.

Flowers

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.

Achenes

greenish white to light tan, 1.2–2 mm, faintly rugose, ± carunculate.

Ivesia arizonica

Distribution
from FNA
AZ; CA; NV; UT
[BONAP county map]
Discussion

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.)

Key
1. Petals yellow; hypanthia campanulate.
var. arizonica
1. Petals white; hypanthia turbinate.
var. saxosa
Source FNA vol. 9, p. 224.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae
Sibling taxa
I. aperta, I. argyrocoma, I. baileyi, I. callida, I. campestris, I. cryptocaulis, I. gordonii, I. jaegeri, I. kingii, I. longibracteata, I. lycopodioides, I. muirii, I. multifoliolata, I. paniculata, I. patellifera, I. pickeringii, I. pityocharis, I. pygmaea, I. rhypara, I. sabulosa, I. santolinoides, I. saxosa, I. sericoleuca, I. setosa, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis, I. webberi
Subordinate taxa
I. arizonica var. arizonica, I. arizonica var. saxosa
Synonyms Purpusia arizonica
Name authority (Eastwood ex J. T. Howell) Ertter: Syst. Bot. 14: 233. (1989)
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