Flora of North America species comparison

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Lathyrus lanszwertii var. lanszwertii

Lathyrus lanszwertii var. pallescens
Photo is of parent taxon

lanszwert's pea, Nevada pea, thick-leaf peavine
Photo is of parent taxon
Stems

sprawling or climbing, 4–8 dm.

erect to climbing, 2–6 dm.
Leaves

5–8 cm, terminating in well-developed, usually branched tendril;

leaflets 8–10, blades usually lanceolate, rarely linear, 30–70 × 5–20 mm.

3–6 cm, usually terminating in well-developed, usually branched tendril;

leaflets 6–8, blades lanceolate, 20–50 × 7–16 mm.
Inflorescences

3–9 cm.

5–10 cm.
Flowers

10–15 mm, corolla blue-purple, banner retuse to shallowly cordate.

10–15 mm, corolla white.
2n

= 14, 28.

Lathyrus lanszwertii var. lanszwertii

Lathyrus lanszwertii var. pallescens
Phenology Flowering Mar–Jun. Flowering Apr–Jun.
Habitat Parkland, thickets, sagebrush, juniper, pine, and aspen woodlands. Park­land, thickets, sagebrush, oak, pine, aspen, and mixed conifer woodlands.
Elevation 900–3100 m. (3000–10200 ft.) 1500–3200 m. (4900–10500 ft.)
Distribution
from FNA
CA; CO; ID; NV; OR; UT; WA; WY
[BONAP county map]
from FNA
CO; UT; WY
Discussion

Variety lanszwertii is found in northern California, western Colorado, central Idaho, western Nevada, eastern Oregon, the Wasatch Mountains of northeastern Utah, southeastern Washington, and north-central Wyoming.

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

Variety pallescens is sometimes confused with Lathyrus laetivirens from which it differs in having smaller flowers (10–15 mm versus 15–20 mm in L. laetivirens), and 6–8 lanceolate versus 8–10 ovate leaflets.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Lathyrus > Lathyrus lanszwertii Fabaceae > subfam. Faboideae > Lathyrus > Lathyrus lanszwertii
Sibling taxa
L. lanszwertii var. aridus, L. lanszwertii var. bijugatus, L. lanszwertii var. leucanthus, L. lanszwertii var. pallescens
L. lanszwertii var. aridus, L. lanszwertii var. bijugatus, L. lanszwertii var. lanszwertii, L. lanszwertii var. leucanthus
Name authority unknown Barneby in A. Cronquist et al.: Intermount. Fl. 3(B): 206. (1989)
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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