Ivesia gordonii var. alpicola
Ivesia gordonii var. wasatchensis
alpine ivesia, Gordon's ivesia, Howell's ivesia
Wasatch 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, ± erect, (1–)1.5–4 dm, sometimes sparsely villous, minutely glandular, often glandular-pubescent.
2–8(–10) × 0.5–1(–1.5) cm;
leaflets 2–5(–9) mm, hirsute to pilose, rarely minutely glandular at least marginally.
9–20(–25) × 1–2(–3) cm;
leaflets 7–13(–18) mm, glabrous or sparsely hirsute or villous marginally.
5–25-flowered, usually simple, 1–3(–4) cm diam., glomerules usually 1, ± capitate.
10–50(–70)-flowered, usually branched, 2–8(–11) cm diam., glomerules (1–)2–6(–10), ± 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.
9–12 mm diam.;
epicalyx bractlets 2–4 mm;
hypanthium 2.5–4(–4.5) × 2.5–4(–5) mm;
sepals 3–5(–6) mm, acute to obtuse;
anthers sometimes red-margined.
Ivesia gordonii var. alpicola
Ivesia gordonii var. wasatchensis
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 wasatchensis is more broadly defined here than the “wasatchensis” of N. H. Holmgren (1997b). The variety is most distinct in the greater Wasatch Range and in the western Uinta Mountains, where plants are generally larger than other varieties with larger leaves, more elongated leaflets, and multi-headed inflorescences. Less distinctive populations extend along the Idaho-Wyoming border to southwestern Montana. Variety wasatchensis merges with var. gordonii at low elevations in Montana and Wyoming, and with the high-elevation phase assigned here to var. gordonii in Utah.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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