Lathyrus graminifolius |
Lathyrus japonicus |
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grass-leaf pea |
beach or maritime or sand pea, beach pea, beach vetchling, maritime pea, sea pea, seaside pea |
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Habit | Herbs perennial, from rhizome or woody rootstock, glabrous. | Herbs perennial, from rhizome, glabrous or sparsely pubescent. | ||||||||
Stems | angled, sprawling or climbing, sometimes branched at flowering nodes, 2–6 dm. |
angled to narrowly winged, erect, sprawling, or climbing, basally branched 0–4 times, 1–10 dm. |
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Leaves | 5–9 cm; tendrils usually well developed; stipules lanceolate to linear, 8–12 × 1–5 mm, much smaller than leaflets; leaflets 4–8, scattered, blades usually linear, rarely lanceolate, 30–80 × 1–20 mm, surfaces glabrous. |
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. |
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Inflorescences | 5–8-flowered, 10–18 cm. |
4–9-flowered, 4–15 cm. |
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Flowers | 8–15 mm; calyx lobes subequal, lateral lobes deltate, shorter than tube; corolla white to blue-orchid, banner erect, blade equal to claw, wings equal to keel; ovary glabrous. |
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. |
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Legumes | 30–50 × 4–8 mm. |
35–65 × 6–12 mm. |
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2n | = 14. |
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Lathyrus graminifolius |
Lathyrus japonicus |
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Phenology | Flowering Apr–Aug. | |||||||||
Habitat | Slopes of ponderosa pine, mixed conifer, spruce-fir and oak-juniper forests. | |||||||||
Elevation | 1000–2800 m. (3300–9200 ft.) | |||||||||
Distribution |
AZ; NM; TX; Mexico (Chihuahua, Sonora)
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North America; Eurasia [Introduced in s South America]
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Discussion | Lathyrus graminifolius is known from the eastern half of Arizona to the western two-thirds of New Mexico and in trans-Pecos Texas. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. palustris var. graminifolius | |||||||||
Name authority | (S. Watson) T. G. White: Bull. Torrey Bot. Club 21: 454. (1894) | Willdenow: Sp. Pl. 3: 1092. (1802) | ||||||||
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