Flora of North America species comparison

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Ivesia aperta var. aperta

Rosaceae subfam. rosoideae
Photo is of parent taxon

Sierra Valley ivesia, Sierra Valley mousetail
Habit Herbs, shrubs, or subshrubs.
Stems

ascending to erect.

Leaves

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

stipules present, rarely absent.
Flowers

(20–)30–250, usually more than 10 per glomerule, 5–10 mm diam.;

hypanthium 2–3(–4) mm diam.;

petals oblanceolate, 2–3 mm, shorter than sepals;

filaments 1–1.5(–2) mm;

styles 2–3 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).
2n

= 28.

Ivesia aperta var. aperta

Rosaceae subfam. rosoideae
Phenology Flowering summer.
Habitat Dry meadows, edges of seeps, slopes, and flats, on vernally saturated volcanic soil, in sagebrush and grass communities, conifer woodlands
Elevation 1300–2300 m (4300–7500 ft)
Distribution
from FNA
CA; 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 aperta is most abundant in Sierra Valley and its drainages in Plumas and Sierra counties, California, barely extending into Lassen County. Disjunct populations occur in the Carson Range in southern Washoe County and the Virginia Range of Storey County, Nevada.

The chromosome count given here is based on a collection originally identified as Ivesia sericoleuca (D. D. Keck & A. Gustafsson 4901).

(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. 241. FNA vol. 9, p. 23. Author: Luc Brouillet.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Unguiculatae > Ivesia aperta Rosaceae
Sibling taxa
I. aperta var. canina
Subordinate taxa
Name authority unknown 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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