Flora of North America species comparison

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Oxytropis besseyi var. obnapiformis
Photo is of parent taxon

Bessey's locoweed
Habit Plants usually robust.
Leaves

4–11(–15) cm;

rachis 3–9 cm, surpassing leaflets;

leaflets (5 or)7–25, distant and scattered on rachis, 6–18 mm.
Racemes

8–22-flowered, dense.
Peduncles

6–13 cm, surpassed by leaves or leaves reaching only to proximalmost flowers, axis 2.5–8(–10) cm in fruit.
Corollas

15–23 mm.
Calyces

(7–)8–13 mm, subappressed-silky.
Legumes

sessile, strongly ovoid-inflated, rupturing calyx at maturity, densely gray-villous, hairs ascending.

Oxytropis besseyi var. obnapiformis
Phenology Flowering spring–early summer.
Habitat Sandhills, sandy bluffs.
Elevation 1600–2200 m. (5200–7200 ft.)
Distribution
from FNA
CO; UT; WY
[BONAP county map]
Discussion

Variety obnapiformis is restricted to Moffat County, Colorado, Daggett County, Utah, and southwest Wyoming.

The fruit of var. obnapiformis is sessile or nearly so, not substipitate to short-stipitate as in other varieties of the species with inflated fruits. Plants from the type locality near Mayfield, Colorado, have 13–25 leaflets and racemes about equaling the leaves. Those from Daggett County, Utah, have 5–11 leaflets and racemes surpassing the leaves. Plants from elsewhere are intermediate and tie the two phases together.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Oxytropis > Oxytropis besseyi
Sibling taxa
O. besseyi var. argophylla, O. besseyi var. besseyi, O. besseyi var. fallax, O. besseyi var. salmonensis, O. besseyi var. ventosa
Synonyms O. obnapiformis, O. nana var. obnapiformis
Name authority (Ced. Porter) S. L. Welsh: Great Basin Naturalist 38: 337. (1978)
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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