Lathyrus japonicus |
Lathyrus pauciflorus |
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beach or maritime or sand pea, beach pea, beach vetchling, maritime pea, sea pea, seaside pea |
few-flower pea, few-flower pea-vine, few-flower vetchling |
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Habit | Herbs perennial, from rhizome, glabrous or sparsely pubescent. | Herbs perennial, from rhizome or thickened rootstock, glabrous. | ||||||||||||
Stems | angled to narrowly winged, erect, sprawling, or climbing, basally branched 0–4 times, 1–10 dm. |
angled, erect, sprawling, or climbing, basally branched 1–3 times, 3–8 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. |
6–9 cm; tendrils well developed; stipules ovate to lanceolate, 15–25 × 5–11 mm, much smaller than leaflets; leafets 6–10, scattered, blades lanceolate to linear or ovate, 20–80 × 2–35 mm, surfaces glabrous. |
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Inflorescences | 4–9-flowered, 4–15 cm. |
4–13-flowered, 5–18 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. |
12–20 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla pale blue-lavender to purple, banner erect, blade longer than claw, wings longer than keel, (by 1–4 mm); ovary glabrous. |
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Legumes | 35–65 × 6–12 mm. |
30–50 × 5–10 mm. |
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Lathyrus japonicus |
Lathyrus pauciflorus |
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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) | Fernald: Bot. Gaz. 19: 335. (1894) | ||||||||||||
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