Lathyrus palustris |
Lathyrus sulphureus |
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gesse des marais, marsh pea, marsh peavine, marsh vetchling |
Brewer's sweet or snub or sulfur pea, Brewer's sweet pea, snub pea, sulfur pea, sulpher pea, sulphur pea |
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Habit | Herbs perennial, from rhizome, glabrous or pubescent. | Herbs perennial, from rhizome, usually glabrous, rarely pubescent. | ||||
Stems | narrowly to broadly winged, sprawling or climbing, basally branched 0–4 times, 2–10 dm. |
angled, climbing, basally branched 0–3 times, 5–15 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. |
9–12 cm; tendrils well developed; stipules lanceolate, 15–25 × 4–10 mm, sometimes equal to distal leaflets; leaflets 6–12, scattered, blades ovate to lanceolate, 25–50 × 10–20 mm, surfaces glabrous or pubescent. |
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Inflorescences | 2–7-flowered, 3–15 cm. |
9–15-flowered, 6–10 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. |
11–13 mm; calyx lobes unequal, lateral lobes deltate to lanceolate, shorter than tube; corolla orange to yellow-cream, banner erect, blade shorter than claw, wings equal to keel; ovary glabrous. |
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Legumes | 25–60 × 4–8 mm. |
40–70 × 4–6 mm. |
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2n | = 14. |
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Lathyrus palustris |
Lathyrus sulphureus |
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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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w 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) | W. H. Brewer ex A. Gray: Proc. Amer. Acad. Arts 7: 399. (1868) | ||||
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