Ivesia gordonii

(Hooker) Torrey & A. Gray in War Department [U.S.]

in War Department [U.S.], Pacif. Railr. Rep. 6(3): 72. 1858.

EndemicIllustrated
Basionym: Horkelia gordonii Hooker Hooker’s J. Bot. Kew Gard. Misc. 5: 341, plate 12. 1853 (as gordoni)
Synonyms: Potentilla gordonii (Hooker) Greene
Treatment appears in FNA Volume 9. Treatment on page 233. Mentioned on page 230, 231, 234.

Plants green, ± tufted, sometimes rosetted; taproot stout, not fleshy. Stems prostrate to erect, (0.2–) 0.5–4 dm. Basal leaves tightly to loosely cylindric, (1–) 3–20 (–25) cm; sheathing base ± glandular abaxially, otherwise glabrous; petiole 0.5–8 cm, hairs 0.2–0.5 mm; leaflets (6–) 10–25 per side, (1–) 2–13 (–18) mm, glabrous or ± hirsute or villous, glandular-puberulent or pubescent, lobes (2–) 4–8 (–15), linear or narrowly oblanceolate to obovate, apex rarely setose. Cauline leaves 1 (–2), not paired. Inflorescences 5–50 (–70) -flowered, 1–8 (–11) cm diam.; glomerules 1–several. Pedicels 1–3 (–5) mm. Flowers 5–12 mm diam.; epicalyx bractlets linear to narrowly elliptic, (0.5–) 1–3.5 (–4) mm; hypanthium turbinate to campanulate, (1.5–) 2–4 (–4.5) × 2–4 (–5) mm; sepals (2–) 2.5–5 (–6) mm, obtuse to ± acute; petals yellow, narrowly oblanceolate to narrowly spatulate, (1–) 1.5–3 mm; stamens 5, filaments 1.3–2.5 mm, anthers yellow, sometimes red-margined, 0.5–1 mm; carpels (1–) 2–4 (–6), styles 2.5–4.5 (–6) mm. Achenes grayish brown to mottled brown, ± 2 mm.

Distribution

V9 357-distribution-map.jpg

Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.

Discussion

Varieties 4 (4 in the flora).

Ivesia gordonii is the most widespread species of the genus, occurring from Washington to Montana, south to central California and Colorado. The species can be distinguished from other members of sect. Ivesia by the relatively deep hypanthium, which is about as deep as wide. Four varieties are provisionally recognized here (B. Ertter and J. L. Reveal 2007), with the likelihood that future work may indicate additional and/or alternate circumscriptions. Populations that are difficult to assign to a variety can be found where the recognizable taxonomic units come together, for example, in northeastern Utah and western Wyoming, involving var. gordonii and var. wasatchensis, and in California and central Idaho where var. alpicola and var. ursinorum tend to merge.

Selected References

None.

Key

1 Leaflets 7–13(–18) mm, glabrous or sparsely hirsute or villous marginally; stems (1–)1.5–4 dm; inflorescences usually branched, 2–8(–11) cm diam., glomerules (1–)2–6(–10), ± capitate. Ivesia gordonii var. wasatchensis
1 Leaflets (1–)2–7(–9) mm, hairy or ± glabrous except marginally ciliate; stems (0.2–)0.5–2.5 dm; inflorescences simple or branched, 1–3(–5) cm diam., glomerules 1(–3), ± capitate to loosely congested > 2
2 Stems usually prostrate to ascending, rarely nearly erect, usually dark reddish, minutely glandular or glandular-puberulent to -pubescent; leaves to 0.8 cm diam.; anthers usually red-margined. Ivesia gordonii var. ursinorum
2 Stems usually ascending to erect, sometimes decumbent, usually greenish, rarely reddish, hirsute to villous, glandular-puberulent to -pubescent; leaves to 1.5 cm diam.; anthers rarely red-margined > 3
3 Stems usually hirsute to villous, sometimes densely so, glandular-pubescent or eglandular; basal leaves (3–)5–10(–15) cm; flowers 7–12 mm diam.; e Idaho and w Montana to Utah, Wyoming, and w Colorado. Ivesia gordonii var. gordonii
3 Stems not or sparsely hirsute to villous, glandular-puberulent or -pubescent; basal leaves 2–8(–10) cm; flowers 5–9 mm diam.; s Washington to California and e to w Montana. Ivesia gordonii var. alpicola

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

... more about "Ivesia gordonii"
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 +
20 cm200 mm <br />0.2 m <br /> (25 cm250 mm <br />0.25 m <br />) +
3 cm30 mm <br />0.03 m <br /> (20 cm200 mm <br />0.2 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 +
Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +, Wash. +  and Wyo. +
not +  and aggregated +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.5 cm5 mm <br />0.005 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 +
1 +  and several +
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 />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
5-50(-70)-flowered +
1 cm10 mm <br />0.01 m <br /> (8 cm80 mm <br />0.08 m <br />) +
crassinucellate +
opposite +  and alternate +
winter-marcescent +
deciduous +  and persistent +
1.3 cm13 mm <br />0.013 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
, +  and distinct +
not +  and distinguishable +
pubescent +, glandular-puberulent +, villous +, hirsute +  and glabrous +
0.2 cm2 mm <br />0.002 m <br /> (1.3 cm13 mm <br />0.013 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 />) +
adnate +, free +, connate +  and distinct +
in War Department [U.S.], Pacif. Railr. Rep. +
not arillate +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
persistent +
free +  and distinct +
erect +  and spreading +
obtuse +  and more or less acute +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Endemic +  and Illustrated +
free +  and distinct +
branched +  and simple +
reddish +, grayish +  and green +
prostrate +  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 +
Ivesia sect. Ivesia +
species +
inconspicuous +
stipelike +, elongate +, less flat +  and conic or turbinate +
enlarged +
glabrate +  and sparsely densely glandular-puberulent +