Lathyrus palustris |
Lathyrus biflorus |
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gesse des marais, marsh pea, marsh peavine, marsh vetchling |
two-flower pea, two-flower sweet pea |
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Habit | Herbs perennial, from rhizome, glabrous or pubescent. | Herbs perennial, from rhizome, villous. |
Stems | narrowly to broadly winged, sprawling or climbing, basally branched 0–4 times, 2–10 dm. |
angled, erect or sprawling, basally branched 1–3 times, 0.5–1 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. |
0.5–1 cm; tendrils absent or reduced to flattened bristles; stipules linear, 4–5 × 1–2 mm, ca. 1/2 length of leaflets; leaflets (3 or)4(or 5), paired, blades lanceolate, 6–12 × 2–3 mm, surfaces finely villous. |
Inflorescences | 2–7-flowered, 3–15 cm. |
1- or 2-flowered, 1 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. |
7–8 mm; calyx lobes subequal, lateral lobes deltate, shorter than tube; corolla cream, banner erect, blade equal to claw, wings equal to keel; ovary glabrous. |
Legumes | 25–60 × 4–8 mm. |
13–15 × 3–5 mm. |
2n | = 14. |
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Lathyrus palustris |
Lathyrus biflorus |
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Phenology | Flowering Apr–Aug. | Flowering Jun. |
Habitat | Coastal and inland wetlands. | Serpentine outcrops and Jeffrey pine woodlands. |
Elevation | 0–1800 m. (0–5900 ft.) | 1300–1400 m. (4300–4600 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 |
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 biflorus is known only from southeastern Humboldt County. (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) | T. W. Nelson & J. P. Nelson: Brittonia 35: 183, fig. 2. (1983) |
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