Flora of North America species comparison

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Oxytropis campestris var. jordalii

Oxytropis campestris var. cusickii
Photo is of parent taxon

jordal's field locoweed, jordal's locoweed, jordal's oxytrope
Photo is of parent taxon

Cusick's field crazyweed, Cusick's field locoweed, Cusick's locoweed, Cusick's oxytrope, field locoweed, yellow locoweed
Habit Plants 5–12(–18) cm, herbage sparsely pilose, hairs subappressed. Plants 4–15(–21) cm, herbage sparsely to densely pilose.
Leaves

1.5–9 cm;

stipules glabrous or strigose abaxially, margins ± ciliate, apex often bristly;

leaflets 9–19, scattered or opposite, blades 1–11 mm.

1.2–12 cm;

stipules glabrous or sparsely pilose proximally, margins ciliate or eciliate;

leaflets 7–15(–17), opposite, subopposite, or scattered, blades 4–23 mm.
Racemes

usually 2–9-flowered, subcapitate or somewhat elongate.

3–15-flowered, subcapitate to somewhat elongate.
Peduncles

3–12(–14) cm, axis 1–4.5 cm in fruit.

prostrate to erect, 2–19 cm, glabrate, appressed-pilose, or villous-pilose, axis 0.5–3(–6) cm in fruit.
Corollas

whitish or yellowish, sometimes polychrome, 10–14(–15) mm.

whitish or yellowish throughout, keel tip usually not maculate, 14–18(–20) mm.
Calyces

tube (3.7–)4–5.5 mm, lobes 1–1.5 mm.

tube 6–9 mm, lobes 1–3.5(–4) mm.
Legumes

9–12 × 3.5–5 mm.

10–19 × 3.5–5(–6) mm.
2n

= 32.

= 48.

Oxytropis campestris var. jordalii

Oxytropis campestris var. cusickii
Phenology Flowering spring–summer. Flowering summer.
Habitat Alpine tundra, heathlands, gravel bars, exposed ridges. Talus slopes, ridge crests, alpine or subalpine meadows, usually above timberline.
Elevation 10–1300 m. (0–4300 ft.) 2100–3400 m. (6900–11200 ft.)
Distribution
from FNA
AK; BC; NT; YT
[BONAP county map]
from FNA
CO; ID; MT; OR; UT; WA; WY; AB; BC
[BONAP county map]
Discussion

Variety jordalii is transitional to vars. roaldii and varians. Data from J. L. Jorgensen et al. (2003) give some support to O. jordalii and O. varians as distinct species.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Variety cusickii is highly variable in flower size, especially where the large-flowered Oxytropis sericea var. speciosa occurs nearby. The existence of apparently transitional populations demonstrates the absence of consistent diagnostic features to separate what are, otherwise, rather distinctive taxa. The flowers seldom fade to a relatively bright yellowish on drying, as in O. sericea var. speciosa. It is not always possible to distinguish specimens of var. cusickii from var. spicata. Those materials traditionally passing as var. cusickii often occur in near proximity to var. spicata, which occurs at lower elevations on the same mountain ranges.

Oxytropis alpicola (Rydberg) M. E. Jones is an illegitimate name that pertains here.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Oxytropis > Oxytropis campestris Fabaceae > subfam. Faboideae > Oxytropis > Oxytropis campestris
Sibling taxa
O. campestris var. chartacea, O. campestris var. columbiana, O. campestris var. cusickii, O. campestris var. davisii, O. campestris var. dispar, O. campestris var. johannensis, O. campestris var. minor, O. campestris var. roaldii, O. campestris var. spicata, O. campestris var. varians, O. campestris var. wanapum
O. campestris var. chartacea, O. campestris var. columbiana, O. campestris var. davisii, O. campestris var. dispar, O. campestris var. johannensis, O. campestris var. jordalii, O. campestris var. minor, O. campestris var. roaldii, O. campestris var. spicata, O. campestris var. varians, O. campestris var. wanapum
Synonyms O. jordalii, O. campestris subsp. jordalii, O. leucantha subsp. jordalii O. cusickii, Aragallus alpicola, Astragalus alpicola, O. campestris var. rydbergii, O. paysoniana, O. rydbergii
Name authority (A. E. Porsild) S. L. Welsh: Leafl. W. Bot. 10: 25. (1963) (Greenman) Barneby: Leafl. W. Bot. 6: 111. (1951)
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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