Lathyrus palustris |
Lathyrus torreyi |
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gesse des marais, marsh pea, marsh peavine, marsh vetchling |
redwood pea, Torrey's pea, Torrey's peavine |
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Habit | Herbs perennial, from rhizome, glabrous or pubescent. | Herbs perennial, from rhizome, finely villous. |
Stems | narrowly to broadly winged, sprawling or climbing, basally branched 0–4 times, 2–10 dm. |
angled, erect to sprawling, basally branched 0–3 times, 1–4 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. |
2–7 cm; tendrils absent or mucronate; stipules lanceolate, 7–12 × 2–5 mm, much smaller than leaflets; leaflets 8–16, scattered, blades ovate to lanceolate, 5–15 × 3–10 mm, surfaces villous. |
Inflorescences | 2–7-flowered, 3–15 cm. |
1- or 2-flowered, 0.5–3 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. |
8–12 mm; calyx lobes unequal, lateral lobes linear-triangular, longer than tube; corolla blue-purple, banner erect, blade equal to claw, wings longer than keel; ovary densely pubescent. |
Legumes | 25–60 × 4–8 mm. |
15–20 × 4–5 mm. |
2n | = 14. |
= 14. |
Lathyrus palustris |
Lathyrus torreyi |
|
Phenology | Flowering Apr–Aug. | Flowering Apr–Jul. |
Habitat | Coastal and inland wetlands. | Open coniferous forests. |
Elevation | 0–1800 m. (0–5900 ft.) | 50–1500 m. (200–4900 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
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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.) |
Lathyrus torreyi is known from in and west of the Cascade Range; it is very rare in Washington. (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. 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) | A. Gray: Proc. Amer. Acad. Arts 7: 337. (1868) |
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