Flora of North America species comparison

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Ivesia arizonica var. saxosa

Rosaceae subfam. rosoideae
Photo is of parent taxon

rock purpusia, rock whitefeather
Habit Herbs, shrubs, or subshrubs.
Leaves

alternate, rarely opposite, pinnately compound, sometimes simple or palmately compound;

stipules present, rarely absent.
Inflorescences

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

Flowers

hypanthium turbinate, ± 2 times as deep as wide;

petals white;

anthers 1–1.5 mm.

torus usually enlarged, sometimes small or absent;

carpels 1–260(–450), distinct, free, styles distinct, rarely connate (Roseae);

ovules 1(or 2), collateral (Rubeae) or superposed (Fallugia, Filipendula).
Fruits

achenes or aggregated achenes sometimes with fleshy, urn-shaped hypanthium or enlarged torus, sometimes aggregated drupelets;

styles persistent or deciduous, not elongate (elongate but not plumose in Geum).
x

= 7(8).

Ivesia arizonica var. saxosa

Rosaceae subfam. rosoideae
Phenology Flowering summer.
Habitat 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 1500–2100 m (4900–6900 ft)
Distribution
from FNA
NV
[BONAP county map]
North America; Mexico; Central America; South America; West Indies; Bermuda; Eurasia; Africa; Atlantic Islands; Indian Ocean Islands; Pacific Islands; Australia
Discussion

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.)

Variation in the number of genera in subfam. Rosoideae is due to differences in generic delimitation between D. Potter et al. (2007) and the authors of some Potentilleae genera. Cyanogenic glycosides and sorbitol are absent in the subfamily.

Tribes 6, genera 28–35, species ca. 1600 (6 tribes, 26 genera, 302 species, including 1 hybrid, in the flora)

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 226. FNA vol. 9, p. 23. Author: Luc Brouillet.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae > Ivesia arizonica Rosaceae
Sibling taxa
I. arizonica var. arizonica
Subordinate taxa
Synonyms Purpusia saxosa, Potentilla osterhoutii var. saxosa
Name authority (Brandegee) Ertter: Syst. Bot. 14: 233. (1989) Arnott: Botany, 107. (1832)
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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