Lathyrus palustris |
Lathyrus odoratus |
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gesse des marais, marsh pea, marsh peavine, marsh vetchling |
common sweet pea, gesse odorante, sweet pea, sweet vetchling |
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Habit | Herbs perennial, from rhizome, glabrous or pubescent. | Herbs annual, glabrous or sparsely pubescent. |
Stems | narrowly to broadly winged, sprawling or climbing, basally branched 0–4 times, 2–10 dm. |
broadly winged, climbing, basally branched 1–3 times, 8–30 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. |
2–6 cm, rachises winged; tendrils well developed; stipules lanceolate, 10–25 × 2–6 mm, smaller than leaflets; leaflets 2, blades ovate or obovate, 15–50 × 10–40 mm, surfaces glabrous or sparsely pustulose-hirsute. |
Inflorescences | 2–7-flowered, 3–15 cm. |
2–4-flowered, 10–20 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. |
20–25 mm; calyx lobes equal, lateral lobes linear-triangular to lanceolate, equal to tube; corolla white, pink, purple, violet, or blue, banner erect, blade much longer than claw, wings longer than keel; ovary densely pustulose-hirsute, style rotated 90° from ovary axis. |
Legumes | 25–60 × 4–8 mm. |
50–70 × 8–15 mm. |
2n | = 14. |
= 14. |
Lathyrus palustris |
Lathyrus odoratus |
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Phenology | Flowering Apr–Aug. | Flowering Apr–May. |
Habitat | Coastal and inland wetlands. | Disturbed areas. |
Elevation | 0–1800 m. (0–5900 ft.) | 50–400 m. (200–1300 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; CA; CT; IL; IN; KY; ME; MI; OH; OK; SC; TN; TX; VA; WV; MB; NF; ON; QC; Europe [Introduced in North America; introduced also in Mexico (México), Asia (China, India), n, e Africa, Pacific Islands (New Zealand), Australia]
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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 odoratus is cultivated as an ornamental and is an occasional escape. (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) | Linnaeus: Sp. Pl. 2: 732. (1753) |
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