Lathyrus palustris |
Lathyrus decaphyllus |
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gesse des marais, marsh pea, marsh peavine, marsh vetchling |
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Habit | Herbs perennial, from rhizome, glabrous or pubescent. | Herbs perennial, from rhizome. | ||||
Stems | narrowly to broadly winged, sprawling or climbing, basally branched 0–4 times, 2–10 dm. |
angled, erect or sprawling, basally branched 0–2 times, 1.5–3 dm. |
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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. |
1–4 cm; tendrils bristlelike, usually less than 1 cm; stipules linear to lanceolate, 10–30 × 1–5 mm, nearly equal to leaflets; leaflets 8–12, often paired, blades lanceolate to linear, 10–35 × 1–5 mm, surfaces glabrous or pubescent. |
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Inflorescences | 2–7-flowered, 3–15 cm. |
2–6-flowered, 4–11 cm. |
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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. |
16–22 mm; calyx lobes subequal, lateral lobes deltate, shorter than tube; corolla usually violet to magenta, sometimes white, banner erect, blade longer than claw, wings 4–5 mm longer than keel; ovary glabrous. |
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Legumes | 25–60 × 4–8 mm. |
35–50 × 8–12 mm, stipitate. |
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2n | = 14. |
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Lathyrus palustris |
Lathyrus decaphyllus |
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Phenology | Flowering Apr–Aug. | |||||
Habitat | Coastal and inland wetlands. | |||||
Elevation | 0–1800 m. (0–5900 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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wc United States |
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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.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||
Parent taxa | Fabaceae > subfam. Faboideae > Lathyrus | Fabaceae > subfam. Faboideae > Lathyrus | ||||
Sibling taxa | ||||||
Subordinate 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) | Pursh: Fl. Amer. Sept. 2: 471. (1813) | ||||
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