Lathyrus palustris |
Lathyrus angulatus |
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gesse des marais, marsh pea, marsh peavine, marsh vetchling |
angle pea, angle pea vine |
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Habit | Herbs perennial, from rhizome, glabrous or pubescent. | Herbs annual, glabrous. |
Stems | narrowly to broadly winged, sprawling or climbing, basally branched 0–4 times, 2–10 dm. |
angled, erect, sprawling, or climbing, basally branched 1–several times, 1–5 dm. |
Leaves | 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. |
0.3–1 cm; tendrils reduced to bristles on proximal leaves, well developed distally; stipules lanceolate, 10–20 × 2–4 mm, as wide as leaflets; leaflets 2, blades linear, 20–70 × 1–4 mm, surfaces glabrous. |
Inflorescences | 2–7-flowered, 3–15 cm. |
1-flowered, 2–7 cm, prolonged beyond flower into tendril-like structure. |
Flowers | 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. |
8–10 mm; calyx lobes equal, lateral lobes deltate, shorter than tube; corolla blue-purple, banner erect, blade equal to claw, wings equal to keel; ovary glabrous. |
Legumes | 25–60 × 4–8 mm. |
20–40 × 3–5 mm, with indistinct reticulate venation. |
2n | = 14. |
= 14. |
Lathyrus palustris |
Lathyrus angulatus |
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Phenology | Flowering Apr–Aug. | Flowering Mar–Jun. |
Habitat | Coastal and inland wetlands. | Disturbed areas, waste ground. |
Elevation | 0–1800 m. (0–5900 ft.) | 0–1000 m. (0–3300 ft.) |
Distribution |
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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CA; OR; WA; Europe [Introduced in North America; introduced also in Australia]
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Discussion | 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.) |
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Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Lathyrus | Fabaceae > subfam. Faboideae > Lathyrus |
Sibling taxa | ||
Synonyms | 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 | Linnaeus: Sp. Pl. 2: 733. (1753) | Linnaeus: Sp. Pl. 2: 731. (1753) |
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