Lathyrus graminifolius
Lathyrus pusillus
grass-leaf pea
singletary vetchling, tiny pea
angled, sprawling or climbing, sometimes branched at flowering nodes, 2–6 dm.
narrowly winged, sprawling or climbing, basally branched 0–4 times, 3–6 dm.
5–9 cm;
tendrils usually well developed;
stipules lanceolate to linear, 8–12 × 1–5 mm, much smaller than leaflets;
leaflets 4–8, scattered, blades usually linear, rarely lanceolate, 30–80 × 1–20 mm, surfaces glabrous.
1–3 cm;
tendrils well developed;
stipules linear, 10–20 × 2–5 mm, equal to smaller leaflets;
leaflets 2, blades linear, 15–60 × 2–8 mm, surfaces glabrous.
5–8-flowered, 10–18 cm.
terminal, 1- or 2-flowered, 2–4 cm.
8–15 mm;
calyx lobes subequal, lateral lobes deltate, shorter than tube;
corolla white to blue-orchid, banner erect, blade equal to claw, wings equal to keel;
ovary glabrous.
7–10 mm;
calyx lobes subequal, linear-triangular, usually longer than tube;
corolla blue, banner erect, blade equal to claw, wings equal to keel;
ovary glabrous.
30–50 × 4–8 mm.
30–50 × 2–4 mm.
= 14.
= 14.
Lathyrus graminifolius
Lathyrus pusillus
Lathyrus graminifolius is known from the eastern half of Arizona to the western two-thirds of New Mexico and in trans-Pecos Texas.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Lathyrus pusillus, the only North American member of section Notolathyrus, a section centered in South America, is also the only annual species of Lathyrus native to North America. It is native to the southeastern United States; it has been cultivated as a forage crop in Oregon and occasionally escapes, but it has not become naturalized there.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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