Lathyrus japonicus |
Lathyrus rigidus |
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beach or maritime or sand pea, beach pea, beach vetchling, maritime pea, sea pea, seaside pea |
bushy pea, Modoc pea, rigid pea, stiff pea, stiff peavine |
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Habit | Herbs perennial, from rhizome, glabrous or sparsely pubescent. | Herbs perennial, from rootstock, glabrous. | ||||||||
Stems | angled to narrowly winged, erect, sprawling, or climbing, basally branched 0–4 times, 1–10 dm. |
angled, erect, basally branched 5–10 times, 1–3 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. |
1–3 cm; tendrils bristlelike, less than 1 cm; stipules lanceolate, 10–15 × 1–8 mm, equal to distal leaflets; leaflets 4–8, paired, blades lanceolate, 15–30 × 5–10 mm, surfaces glabrous. |
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Inflorescences | 4–9-flowered, 4–15 cm. |
2- or 3-flowered, 4–9 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. |
12–18 mm; calyx lobes ± unequal, lateral lobes deltate, shorter than tube; corolla white to lilac, banner erect, blade longer than claw, wings longer than keel; ovary glabrous. |
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Legumes | 35–65 × 6–12 mm. |
20–40 × 5–10 mm, stipitate. |
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2n | = 14. |
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Lathyrus japonicus |
Lathyrus rigidus |
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Phenology | Flowering Apr–Jun. | |||||||||
Habitat | Basalt scablands with sagebrush. | |||||||||
Elevation | 800–1700 m. (2600–5600 ft.) | |||||||||
Distribution |
North America; Eurasia [Introduced in s South America]
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CA; ID; NV; OR
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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.) |
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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 | ||||||||||
Synonyms | L. albus | |||||||||
Name authority | Willdenow: Sp. Pl. 3: 1092. (1802) | T. G. White: Bull. Torrey Bot. Club 21: 455. (1894) | ||||||||
Web links |
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