Ivesia gordonii var. gordonii

Treatment appears in FNA Volume 9. Treatment on page 234. Mentioned on page 235.

Stems usually greenish, ascending to erect, (0.5–) 1–2.5 dm, usually hirsute to villous, sometimes densely so, glandular-pubescent or eglandular. Basal leaves (3–) 5–10 (–15) × 0.5–1.5 cm; leaflets (1–) 3–7 (–9) mm, hirsute to villous, sometimes hairy only marginally. Inflorescences 10–30-flowered, simple or branched, (1–) 2–3 (–5) cm diam., glomerules 1 (–3), ± capitate. Flowers 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.


Phenology: Flowering summer.
Habitat: Gravelly to rocky flats, slopes, and outcrops, in grassland and sagebrush communities, montane and subalpine conifer woodlands
Elevation: 2000–3600 m

Distribution

V9 358-distribution-map.jpg

Colo., Idaho, Mont., Utah, Wyo.

Discussion

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.

Selected References

None.

Lower Taxa

None.

"dm" is not declared as a valid unit of measurement for this property.

not carunculate +
grayish brown +  and mottled brown +
longer than wide +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Barbara Ertter +  and James L. Reveal +
(Hooker) Torrey & A. Gray in War Department [U.S.] +
compound +  and simple +
opposite +  and alternate +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
20 cm200 mm <br />0.2 m <br /> (25 cm250 mm <br />0.25 m <br />) +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
3 cm30 mm <br />0.03 m <br /> (20 cm200 mm <br />0.2 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Horkelia gordonii +
20 cm200 mm <br />0.2 m <br /> (25 cm250 mm <br />0.25 m <br />) +
narrowly oblong +  and filiform planar +
reduced +
0.5 cm5 mm <br />0.005 m <br /> (20 cm200 mm <br />0.2 m <br />) +
reduced +
elongate +
free +  and distinct +
branched +  and simple +
Colo. +, Idaho +, Mont. +, Utah +  and Wyo. +
not +  and aggregated +
2000–3600 m +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
deciduous +
obliquely ovoid +  and reniform +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
loose +  and capitate +
Gravelly to rocky flats, slopes, and outcrops, in grassland and sagebrush communities, montane and subalpine conifer woodlands +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
branched +, simple +  and 10-30-flowered +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
crassinucellate +
opposite +  and alternate +
winter-marcescent +
deciduous +  and persistent +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
, +  and distinct +
not +  and distinguishable +
hairy +, hirsute +  and villous +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
narrowly oblanceolate +  and obovate +
verticillate +
toothed +, unlobed +  and lobed +
inferior +  and superior +
clustered +, biseriate +  and superposed +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0 (?) +  and 4 (?) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
free +  and distinct +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Flowering summer. +
adnate +, free +, connate +  and distinct +
in War Department [U.S.], Pacif. Railr. Rep. +
not arillate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
persistent +
free +  and distinct +
erect +  and spreading +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Endemic +  and Illustrated +
free +  and distinct +
ascending +  and erect +
2 +  and 20 +
palmate +  and pinnate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
deciduous +
distinct +
subterminal +
filiform +
rough-thickened +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
Potentilla gordonii +
not fleshy +
Ivesia gordonii var. gordonii +
Ivesia gordonii +
variety +
inconspicuous +
stipelike +, elongate +, less flat +  and conic or turbinate +
enlarged +
glabrate +  and sparsely densely glandular-puberulent +