Lathyrus japonicus |
Lathyrus aphaca |
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beach or maritime or sand pea, beach pea, beach vetchling, maritime pea, sea pea, seaside pea |
yellow pea, yellow vetchling |
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Habit | Herbs perennial, from rhizome, glabrous or sparsely pubescent. | Herbs annual, glabrous. | ||||||||
Stems | angled to narrowly winged, erect, sprawling, or climbing, basally branched 0–4 times, 1–10 dm. |
not winged, erect or climbing, basally branched 1–several times, 2–6 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. |
reduced to tendrils, unbranched or branched, 1–4 cm; stipules ovate, 10–35 × 10–25 mm, base hastate, margins entire; leaflets 0. |
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Inflorescences | 4–9-flowered, 4–15 cm. |
1-flowered, 2–4 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. |
6–10 mm; calyx lobes equal, lateral lobes broadly lanceolate, longer than tube; corolla yellow, banner erect, blade equal to claw, wings equal to keel; ovary glabrous. |
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Legumes | 35–65 × 6–12 mm. |
15–30 × 5–7 mm. |
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2n | = 14. |
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Lathyrus japonicus |
Lathyrus aphaca |
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Phenology | Flowering May–Jun. | |||||||||
Habitat | Roadsides, waste areas. | |||||||||
Elevation | 0–700 m. (0–2300 ft.) | |||||||||
Distribution |
North America; Eurasia [Introduced in s South America]
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AL; AR; CA; KY; LA; MD; NE; OR; PA; TN; TX; WA; Eurasia [Introduced in North America; introduced also in n, e Africa]
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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 | ||||||||||
Name authority | Willdenow: Sp. Pl. 3: 1092. (1802) | Linnaeus: Sp. Pl. 2: 729. (1753) | ||||||||
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