Ivesia gordonii var. alpicola
Ivesia gordonii var. gordonii
alpine ivesia, Gordon's ivesia, Howell's ivesia
Gordon's ivesia
usually greenish, rarely reddish, usually ascending to erect, sometimes decumbent, 0.3–2 dm, not or sparsely hirsute to villous, glandular-puberulent or -pubescent.
usually greenish, ascending to erect, (0.5–)1–2.5 dm, usually hirsute to villous, sometimes densely so, glandular-pubescent or eglandular.
2–8(–10) × 0.5–1(–1.5) cm;
leaflets 2–5(–9) mm, hirsute to pilose, rarely minutely glandular at least marginally.
(3–)5–10(–15) × 0.5–1.5 cm;
leaflets (1–)3–7(–9) mm, hirsute to villous, sometimes hairy only marginally.
5–25-flowered, usually simple, 1–3(–4) cm diam., glomerules usually 1, ± capitate.
10–30-flowered, simple or branched, (1–)2–3(–5) cm diam., glomerules 1(–3), ± capitate.
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.
7–12 mm diam.;
epicalyx bractlets (1.5–)2–3(–3.5) mm;
hypanthium 2–4 × 2.5–4 mm;
sepals (2.5–)3.5–5 mm, ± acute;
anthers rarely red-margined.
Ivesia gordonii var. alpicola
Ivesia gordonii var. gordonii
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.)
Variety gordonii occurs from western Montana and eastern Idaho through western and central Wyoming to western Colorado, and in the Uinta and Wasatch mountains of northeastern Utah. Plants have either villous stems, or stems that are both hirsute to villous and glandular-puberulent or -pubescent. Leaflets are usually densely hirsute, and the inflorescence is nearly always simply capitate. The variety is most distinctive at relatively low elevations in Montana south to the Uinta Mountains (Utah) and Moffat County, Colorado, where it is an erect, medium-sized plant with densely hairy leaves. Some populations here assigned to var. gordonii have features of var. wasatchensis, such as branched inflorescences in the Big Horn Mountains of Wyoming, or glabrate vestiture in the northern Colorado Rocky Mountains.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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