Lathyrus palustris |
Lathyrus laetivirens |
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gesse des marais, marsh pea, marsh peavine, marsh vetchling |
aspen pea, aspen peavine, aspen vetchling, plateau peavine, plateau vetchling |
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Habit | Herbs perennial, from rhizome, glabrous or pubescent. | Herbs perennial, from rhizome, glabrous. |
Stems | narrowly to broadly winged, sprawling or climbing, basally branched 0–4 times, 2–10 dm. |
angled, sprawling to erect, basally branched 0–3 times, 2–8 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. |
3–8 cm; tendrils well developed, often branched; stipules lanceolate, 8–12 × 2–5 mm, much smaller than leaflets; leaflets 6–10, usually paired, blades ovate, 20–40 × 10–20 mm, surfaces glabrous. |
Inflorescences | 2–7-flowered, 3–15 cm. |
2–5-flowered, 4–7 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. |
15–20 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla white to slightly pink or lavender, banner erect, blade longer than claw, wings equal to keel; ovary glabrous. |
Legumes | 25–60 × 4–8 mm. |
30–50 × 5–15 mm. |
2n | = 14. |
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Lathyrus palustris |
Lathyrus laetivirens |
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Phenology | Flowering Apr–Aug. | Flowering Apr–Jul. |
Habitat | Coastal and inland wetlands. | Flats, hillsides, sagebrush communities, pinyon-juniper, oak, pine, aspen and Douglas-fir forests. |
Elevation | 0–1800 m. (0–5900 ft.) | 1200–3200 m. (3900–10500 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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AZ; CO; NM; NV; UT
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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.) |
C. L. Hitchcock (1952), S. L. Welsh et al. (1987), and D. Isely (1998) placed Lathyrus laetivirens within the L. lanszwertii complex, whereas R. C. Barneby (1989) treated it as a separate species. (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 | L. lanszwertii var. laetivirens, L. leucanthus var. laetivirens |
Name authority | Linnaeus: Sp. Pl. 2: 733. (1753) | Greene ex Rydberg: Fl. Colorado, 217. (1906) |
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