Lathyrus palustris |
Lathyrus littoralis |
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gesse des marais, marsh pea, marsh peavine, marsh vetchling |
beach pea, beach peavine, dune sweet pea, gray beach or silky beach pea, gray beach pea, grey beach peavine, silky beach pea, silky beach vetchling |
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Habit | Herbs perennial, from rhizome, glabrous or pubescent. | Herbs perennial, from rhizome, cinereous and densely villous throughout. |
Stems | narrowly to broadly winged, sprawling or climbing, basally branched 0–4 times, 2–10 dm. |
angled, sprawling, basally branched 0–4 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. |
1–3 cm; tendrils flattened bristles; stipules ovate to lanceolate, 10–27 × 5–12 mm, often larger than leaflets; leaflets 4 or 6, paired, blades obovate to oblanceolate, 10–20 × 4–8 mm, surfaces densely villous. |
Inflorescences | 2–7-flowered, 3–15 cm. |
4–8-flowered, 3–10 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. |
13–15 mm; calyx lobes equal, lateral lobes deltate, equal to or shorter than tube; corolla dark purple, banner erect, blade longer than claw, wings longer than keel; ovary densely pubescent. |
Legumes | 25–60 × 4–8 mm. |
20–30 × 9–13 mm. |
2n | = 14. |
= 28. |
Lathyrus palustris |
Lathyrus littoralis |
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Phenology | Flowering Apr–Aug. | Flowering Apr–Jun. |
Habitat | Coastal and inland wetlands. | Coastal sand dunes, deflation plain interdune areas. |
Elevation | 0–1800 m. (0–5900 ft.) | 0–15 m. (0–0 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; BC
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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 | Astrophia littoralis |
Name authority | Linnaeus: Sp. Pl. 2: 733. (1753) | (Nuttall) Endlicher in W. G. Walpers: Repert. Bot. Syst. 1: 722. (1842) |
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