Lathyrus japonicus |
Lathyrus brachycalyx |
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beach or maritime or sand pea, beach pea, beach vetchling, maritime pea, sea pea, seaside pea |
Bonneville pea, Bonneville peavine, Bonneville vetchling, Rydberg's peavine |
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Habit | Herbs perennial, from rhizome, glabrous or sparsely pubescent. | Herbs perennial, from rhizome, glabrous or villous. | ||||||||||||
Stems | angled to narrowly winged, erect, sprawling, or climbing, basally branched 0–4 times, 1–10 dm. |
angled, erect, sprawling, or climbing, basally branched 0–3 times, 1–5 dm. |
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Leaves | 3–15 cm; tendrils usually well developed, branched or unbranched; stipules sagittate-ovate, 7–35 × 7–30 mm, as large as basal leaflets; leaflets 6–12, usually scattered, blades ovate to lanceolate, 15–55 × 5–35 mm, surfaces glabrous throughout or pubescent abaxially. |
2–9 cm; tendrils usually well developed, sometimes reduced to a single bristle; stipules lanceolate, 5–12 × 1–3 mm, much smaller than leaflets; leaflets 6–12, scattered, blades elliptic to narrowly so, 8–70 × 3–8 mm, surfaces glabrous or villous. |
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Inflorescences | 4–9-flowered, 4–15 cm. |
2–5-flowered, 5–15 cm. |
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Flowers | 12–29 mm; calyx lobes unequal, lateral lobes linear-triangular, longer than tube; corolla blue to purple, banner erect, blade longer than claw, wings equal to keel; ovary eglandular and glandular-pubescent. |
13–20 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla pinkish to deep blue-purple, banner erect, blade nearly 2 times as long as claw, wings equal to keel; ovary glabrous. |
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Legumes | 35–65 × 6–12 mm. |
30–40 × 6–8 mm. |
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Lathyrus japonicus |
Lathyrus brachycalyx |
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Distribution |
North America; Eurasia [Introduced in s South America]
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w United States
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Discussion | Varieties 3 (3 in the flora). Within Lathyrus japonicus, in the narrow sense, there is a south to north reduction in plant size, including plant height, robustness, and leaflet size, but not flower size, flower number, or fruit size. On the east coast of North America this shift seems fairly abrupt, giving the appearance of a clear distinction between var. maritimus and var. pellitus in the south, and var. japonicus to the north in Labrador and Greenland. However, on the West Coast, there are few truly pubescent forms (var. pellitus), and there seem to be many more intermediates between var. maritimus in the south and var. japonicus to the north. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||||||||||
Parent taxa | Fabaceae > subfam. Faboideae > Lathyrus | Fabaceae > subfam. Faboideae > Lathyrus | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Name authority | Willdenow: Sp. Pl. 3: 1092. (1802) | Rydberg: Bull. Torrey Bot. Club 34: 425. (1907) | ||||||||||||
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