Lathyrus graminifolius |
Lathyrus biflorus |
|
---|---|---|
grass-leaf pea |
two-flower pea, two-flower sweet pea |
|
Habit | Herbs perennial, from rhizome or woody rootstock, glabrous. | Herbs perennial, from rhizome, villous. |
Stems | angled, sprawling or climbing, sometimes branched at flowering nodes, 2–6 dm. |
angled, erect or sprawling, basally branched 1–3 times, 0.5–1 dm. |
Leaves | 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. |
0.5–1 cm; tendrils absent or reduced to flattened bristles; stipules linear, 4–5 × 1–2 mm, ca. 1/2 length of leaflets; leaflets (3 or)4(or 5), paired, blades lanceolate, 6–12 × 2–3 mm, surfaces finely villous. |
Inflorescences | 5–8-flowered, 10–18 cm. |
1- or 2-flowered, 1 cm. |
Flowers | 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. |
7–8 mm; calyx lobes subequal, lateral lobes deltate, shorter than tube; corolla cream, banner erect, blade equal to claw, wings equal to keel; ovary glabrous. |
Legumes | 30–50 × 4–8 mm. |
13–15 × 3–5 mm. |
2n | = 14. |
|
Lathyrus graminifolius |
Lathyrus biflorus |
|
Phenology | Flowering Apr–Aug. | Flowering Jun. |
Habitat | Slopes of ponderosa pine, mixed conifer, spruce-fir and oak-juniper forests. | Serpentine outcrops and Jeffrey pine woodlands. |
Elevation | 1000–2800 m. (3300–9200 ft.) | 1300–1400 m. (4300–4600 ft.) |
Distribution |
AZ; NM; TX; Mexico (Chihuahua, Sonora)
|
CA |
Discussion | 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 biflorus is known only from southeastern Humboldt County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Lathyrus | Fabaceae > subfam. Faboideae > Lathyrus |
Sibling taxa | ||
Synonyms | L. palustris var. graminifolius | |
Name authority | (S. Watson) T. G. White: Bull. Torrey Bot. Club 21: 454. (1894) | T. W. Nelson & J. P. Nelson: Brittonia 35: 183, fig. 2. (1983) |
Web links |