Lathyrus graminifolius |
Lathyrus palustris |
|
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grass-leaf pea |
gesse des marais, marsh pea, marsh peavine, marsh vetchling |
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Habit | Herbs perennial, from rhizome or woody rootstock, glabrous. | Herbs perennial, from rhizome, glabrous or pubescent. |
Stems | angled, sprawling or climbing, sometimes branched at flowering nodes, 2–6 dm. |
narrowly to broadly winged, sprawling or climbing, basally branched 0–4 times, 2–10 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. |
1–6 cm; tendrils well developed; stipules ovate-lanceolate to linear, 5–25 × 1–10 mm, much smaller than leaflets; leaflets 4–8, paired, blades lanceolate to linear, 15–75 × 2–20 mm, surfaces glabrous, glabrate, or pubescent. |
Inflorescences | 5–8-flowered, 10–18 cm. |
2–7-flowered, 3–15 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. |
10–15 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla blue-purple, banner erect, blade equal to claw, wings equal to keel; ovary glandular-pubescent. |
Legumes | 30–50 × 4–8 mm. |
25–60 × 4–8 mm. |
2n | = 14. |
= 14. |
Lathyrus graminifolius |
Lathyrus palustris |
|
Phenology | Flowering Apr–Aug. | Flowering Apr–Aug. |
Habitat | Slopes of ponderosa pine, mixed conifer, spruce-fir and oak-juniper forests. | Coastal and inland wetlands. |
Elevation | 1000–2800 m. (3300–9200 ft.) | 0–1800 m. (0–5900 ft.) |
Distribution |
AZ; NM; TX; Mexico (Chihuahua, Sonora)
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AK; AL; AR; CA; CO; CT; DC; DE; IA; IL; IN; KY; MA; MD; ME; MI; MN; MO; NC; ND; NE; NH; NJ; NY; OH; OR; PA; RI; SD; TN; VA; VT; WA; WI; WV; BC; MB; NB; NL; NS; NU; ON; PE; QC; SK; SPM
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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.) |
Morphological variation within Lathyrus palustris is extensive. Although the most distinctive forms (see synonyms) have been accorded formal nomenclatural recognition (M. L. Fernald 1911; C. L. Hitchcock 1952), intergradation among these mostly sympatric ecotypes is widespread (D. Isely 1998). In Nunavut, it is known only from Akimiski Island in James Bay. (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 | L. myrtifolius, L. palustris var. linearifolius, L. palustris var. macranthus, L. palustris var. myrtifolius, L. palustris subsp. pilosus, L. palustris var. pilosus, L. palustris var. retusus |
Name authority | (S. Watson) T. G. White: Bull. Torrey Bot. Club 21: 454. (1894) | Linnaeus: Sp. Pl. 2: 733. (1753) |
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