Flora of North America species comparison

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Ivesia gordonii var. alpicola
Photo is of parent taxon

alpine ivesia, Gordon's ivesia, Howell's ivesia
Stems

usually greenish, rarely reddish, usually ascending to erect, sometimes decumbent, 0.3–2 dm, not or sparsely hirsute to villous, glandular-puberulent or -pubescent.
Basal leaves

2–8(–10) × 0.5–1(–1.5) cm;

leaflets 2–5(–9) mm, hirsute to pilose, rarely minutely glandular at least marginally.
Inflorescences

5–25-flowered, usually simple, 1–3(–4) cm diam., glomerules usually 1, ± capitate.
Flowers

5–9 mm diam.;

epicalyx bractlets (1.5–)2–3(–4) mm;

hypanthium (2–)2.5–3.5(–4) × 2.5–4 mm;

sepals 2–4(–5) mm, acute;

anthers rarely red-margined.

Ivesia gordonii var. alpicola
Phenology Flowering summer.
Habitat Dry grassy areas on talus, or gravelly or rocky slopes and ridges, in subalpine and alpine montane conifer woodlands, alpine tundra
Elevation 2100–3300 m (6900–10800 ft)
Distribution
from FNA
CA; ID; MT; OR; WA
Discussion

P. A. Rydberg (1898) used var. alpicola (as Horkelia gordonii var. alpicola) for compact, high-elevation plants throughout the range of Ivesia gordonii. As circumscribed here, var. alpicola is restricted to plants occurring disjunctly in an arc around the northwestern part of the species range. Populations occur in the northern Coast Ranges and central Sierra Nevada of California, sporadically to Mount Adams and the Wenatchee Mountains in Washington, and from there to the mountains of central Idaho and the Bitterroot Range of Montana. The variety is also disjunct on the Owyhee Mountains of southwestern Idaho.

Plants of var. alpicola average shorter than those of var. gordonii, which occurs farther east and south. In var. alpicola, stems with only glandular indumentum are common; such stems are rare in var. gordonii. Unlike those of var. gordonii, the leaflets of var. alpicola are frequently glandular with only marginal hairs.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 234.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia > Ivesia gordonii
Sibling taxa
I. gordonii var. gordonii, I. gordonii var. ursinorum, I. gordonii var. wasatchensis
Synonyms I. alpicola, Horkelia gordonii var. alpicola
Name authority (Rydberg ex Howell) Ertter & Reveal: Novon 17: 322. (2007)
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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