Flora of North America species comparison

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Ivesia arizonica var. arizonica

Ivesia arizonica var. saxosa
Photo is of parent taxon

Arizona whitefeather, yellow ivesia, yellow purpusia
Photo is of parent taxon

rock purpusia, rock whitefeather
Inflorescences

1–20(–60)-flowered, 0.5–7 cm diam.

(1–)5–30(–150)-flowered, (0.5–)2–14 cm diam.
Flowers

hypanthium campanulate, ± as deep as wide;

petals yellow;

anthers 0.6–1 mm.

hypanthium turbinate, ± 2 times as deep as wide;

petals white;

anthers 1–1.5 mm.

Ivesia arizonica var. arizonica

Ivesia arizonica var. saxosa
Phenology Flowering summer. Flowering summer.
Habitat Dry, rocky outcrops of calcareous or volcanic origin, usually in crevices of more or less vertical protected cliffs or large boulders, in sagebrush communities, conifer woodlands Dry, rocky outcrops of mainly volcanic origin, usually in crevices of more or less vertical protected cliffs or boulders, in sagebrush communities, pinyon-juniper woodlands
Elevation 1200–2400(–3400) m (3900–7900(–11200) ft) 1500–2100 m (4900–6900 ft)
Distribution
from FNA
AZ; CA; NV; UT
[BONAP county map]
from FNA
NV
[BONAP county map]
Discussion

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.)

Of conservation concern.

Variety saxosa is known from scattered locations in the North and South Pahroc ranges, Lincoln County, and on Pahute Mesa, Nye County, Nevada. Reports of this variety in the Sheep Range of Clark County, Nevada (N. H. Holmgren 1997b; T. L. Ackerman et al. 2003), are probably based on var. arizonica.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 225. FNA vol. 9, p. 226.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae > Ivesia arizonica Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae > Ivesia arizonica
Sibling taxa
I. arizonica var. saxosa
I. arizonica var. arizonica
Synonyms Potentilla osterhoutii, Purpusia osterhoutii Purpusia saxosa, Potentilla osterhoutii var. saxosa
Name authority unknown (Brandegee) Ertter: Syst. Bot. 14: 233. (1989)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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