Flora of North America species comparison

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Oxytropis campestris var. dispar

Oxytropis campestris var. wanapum
Photo is of parent taxon

field locoweed
Photo is of parent taxon

field locoweed, Wanapum crazyweed, Wanapum locoweed
Habit Plants 15–30 cm, herbage densely silky-pilose. Plants (10–)13–21 cm, herbage silky-pilose, canescent.
Leaves

strongly dimorphic, 5–21 cm;

stipules usually concealed by vesture;

leaflets 19–25, scattered or subopposite, blades primary ones crowded, ovate, shorter, distally linear-lanceolate or narrowly oblong, 4–20 mm.

(11–)14–18(–22) cm;

stipules pilose abaxially, margins ciliate;

leaflets (13–)19–25(–33), scattered or subopposite, blades linear to narrowly oblong, (8–)15–25(–33) mm.
Racemes

8–15-flowered, ± open to elongate.

(5 or)6–12-flowered.
Peduncles

7–19(–26) cm, axis 3–8(–11) cm in fruit.

(10–)17–21(–30) cm, axis (4–)6–8(–12) cm in fruit.
Corollas

purple, blue, pink, white, yellowish, or polychrome (in populations), 17–19(–21) mm.

pale lavender, banner veined, keel tip maculate with purplish blue, 14–20(–23) mm.
Calyces

tube 6–6.5 mm, lobes 2–2.7 mm.

tube 5–7 mm, lobes (1–)2–3 mm.
Legumes

13–18 × 3.5–5 mm.

13–23 × 3.5–5 mm.
2n

= 32.

Oxytropis campestris var. dispar

Oxytropis campestris var. wanapum
Phenology Flowering spring–summer. Flowering spring.
Habitat Grass and brush lands. Gravelly ridges above steep north-facing basalt talus.
Elevation 500–1000 m. (1600–3300 ft.) 600 m. (2000 ft.)
Distribution
from FNA
MN; ND; MB; SK
[BONAP county map]
from FNA
WA
[BONAP county map]
Discussion

Variety dispar is closely allied to var. spicata, from which it differs in the flowers being polychrome within populations and in the somewhat firmer texture of the pods. It may well be that var. dispar is the somewhat stabilized product of previous hybridization involving the disjunct pale-flowered var. spicata and the purple-flowered Oxytropis lambertii, common in the same region. However, the presence of var. johannensis, not far distant to the northeast, might account for the occurrence of darker colored flowers in this region.

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

Variety wanapum is restricted to xeric, basaltic gravels, talus, or outcrops in Grant County. Its flowers, suffused with purple, are diagnostic since no other varieties of the species in the Pacific Northwest typically have colored flowers. The narrow-bladed leaflets tend to be involute and to vary in number, usually 19–25. These vegetative features are unlike any of the other several varieties of Oxytropis campestris that occur elsewhere in North America and have lavender to purplish flowers.

(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. 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
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. jordalii, O. campestris var. minor, O. campestris var. roaldii, O. campestris var. spicata, O. campestris var. varians
Synonyms Aragallus dispar, O. dispar, O. monticola subsp. dispar
Name authority (A. Nelson) Barneby: Leafl. W. Bot. 6: 111. (1951) Joyal: Great Basin Naturalist 50: 373, fig. 1. (1991)
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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