Lathyrus palustris |
Lathyrus tuberosus |
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gesse des marais, marsh pea, marsh peavine, marsh vetchling |
earth-nut pea, earth-nut peavine, tuber vetchling, tuberous pea, tuberous sweetpea |
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Habit | Herbs perennial, from rhizome, glabrous or pubescent. | Herbs perennial, from tuber-bearing rhizome, glabrous. |
Stems | narrowly to broadly winged, sprawling or climbing, basally branched 0–4 times, 2–10 dm. |
not winged, sprawling, branched along trailing stems several times, 2–6 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. |
0.5–2 cm; tendrils well developed; stipules filiform-linear, 5–10 × 1–3 mm, much smaller than leaflets; leaflets 2, blades lanceolate, 10–40 × 5–15 mm, surfaces glabrous. |
Inflorescences | 2–7-flowered, 3–15 cm. |
4–6-flowered, 6–15 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. |
8–12 mm; calyx lobes unequal, lateral lobes linear-triangular, equal to tube; corolla reddish, banner erect, blade longer than claw, wings equal to keel; ovary glabrous, style rotated 90° from ovary axis. |
Legumes | 25–60 × 4–8 mm. |
20–30(–40) × 3–6 mm. |
2n | = 14. |
= 14. |
Lathyrus palustris |
Lathyrus tuberosus |
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Phenology | Flowering Apr–Aug. | Flowering Apr–Jun. |
Habitat | Coastal and inland wetlands. | Roadsides, meadows, fields. |
Elevation | 0–1800 m. (0–5900 ft.) | 50–100 m. (200–300 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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CT; IA; IL; IN; KY; MA; ME; MI; MN; MO; MT; NE; NH; NJ; NY; OH; PA; TN; VT; WA; WI; WV; MB; ON; QC; SK; Europe; w Asia [Introduced in North America; introduced also in 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.) |
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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 | |
Name authority | Linnaeus: Sp. Pl. 2: 733. (1753) | Linnaeus: Sp. Pl. 2: 732. (1753) |
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