Lathyrus graminifolius |
Lathyrus sylvestris |
|
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grass-leaf pea |
flat or narrow leaf everlasting or sweet pea, flat pea, narrow-leaf everlasting peavine, narrow-leaf everlasting-pea, narrow-leaf peavine, narrow-leaf vetchling |
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Habit | Herbs perennial, from rhizome or woody rootstock, glabrous. | Herbs perennial, from rhizome, glabrous. |
Stems | angled, sprawling or climbing, sometimes branched at flowering nodes, 2–6 dm. |
broadly winged, sprawling or climbing, basally branched 1–3 times, 6–20 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. |
2–4 cm, rachises winged; tendrils well developed, branched; stipules linear, 10–30 × 1–3 mm, less than 1/2 width of stem, much smaller than leaflets; leaflets 2, blades linear, 20–150 × 4–24 mm, surfaces glabrous. |
Inflorescences | 5–8-flowered, 10–18 cm. |
3–10-flowered, 9–27 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. |
12–17 mm; calyx lobes equal, lateral lobes deltate, usually shorter than tube; corolla red-purple, banner erect, blade longer than claw, wings equal to keel; ovary glandular-pubescent, style rotated 90° from ovary axis. |
Legumes | 30–50 × 4–8 mm. |
30–75 × 5–10 mm. |
2n | = 14. |
= 14. |
Lathyrus graminifolius |
Lathyrus sylvestris |
|
Phenology | Flowering Apr–Aug. | Flowering May–Aug. |
Habitat | Slopes of ponderosa pine, mixed conifer, spruce-fir and oak-juniper forests. | Roadsides, fencerows, waste ground. |
Elevation | 1000–2800 m. (3300–9200 ft.) | 0–1000 m. (0–3300 ft.) |
Distribution |
AZ; NM; TX; Mexico (Chihuahua, Sonora)
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AL; AR; CA; CO; CT; GA; ID; IN; KY; MA; MI; MN; MO; MS; MT; NH; NY; OR; PA; RI; SC; UT; VA; VT; WA; WI; WV; WY; BC; NB; NS; ON; PE; QC; Europe [Introduced in North America; introduced also in Mexico (Nuevo León), Pacific Islands (New Zealand)]
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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 sylvestris is similar to L. latifolius and intermediate populations are known to occur in Europe (M. Valero 1991). In North America, L. sylvestris is distinguished by its distinctly narrower stipules. (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) | Linnaeus: Sp. Pl. 2: 733. (1753) |
Web links |
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