Lathyrus palustris |
Lathyrus nissolia |
|
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gesse des marais, marsh pea, marsh peavine, marsh vetchling |
grass pea, grass vetchling |
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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. |
not winged, erect or sprawling, basally branched 1–several times, 1–8 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. |
phyllodic; tendrils absent; stipules filiform-linear, 1–2 × 1 mm, much smaller than phyllode, base semisaggitate; leaflets 0; phyllodes flattened, linear, and grasslike, 80–140 × 4–10 mm, glabrous. |
Inflorescences | 2–7-flowered, 3–15 cm. |
1- or 2-flowered, 6–10 cm. |
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, equal to tube; corolla crimson, banner erect, blade equal to claw, wings equal to keel; ovary glabrous or pubescent. |
Legumes | 25–60 × 4–8 mm. |
30–60 × 2–4 mm. |
2n | = 14. |
= 14. |
Lathyrus palustris |
Lathyrus nissolia |
|
Phenology | Flowering Apr–Aug. | Flowering Apr–May. |
Habitat | Coastal and inland wetlands. | Disturbed areas, grassy meadows. |
Elevation | 0–1800 m. (0–5900 ft.) | 50–150 m. (200–500 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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OR; WA; Europe [Introduced in North America; introduced also in n Africa] |
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: 729. (1753) |
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