Lathyrus laetivirens |
Lathyrus japonicus |
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aspen pea, aspen peavine, aspen vetchling, plateau peavine, plateau vetchling |
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, glabrous. | Herbs perennial, from rhizome, glabrous or sparsely pubescent. | ||||||||
Stems | angled, sprawling to erect, basally branched 0–3 times, 2–8 dm. |
angled to narrowly winged, erect, sprawling, or climbing, basally branched 0–4 times, 1–10 dm. |
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Leaves | 3–8 cm; tendrils well developed, often branched; stipules lanceolate, 8–12 × 2–5 mm, much smaller than leaflets; leaflets 6–10, usually paired, blades ovate, 20–40 × 10–20 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 | 2–5-flowered, 4–7 cm. |
4–9-flowered, 4–15 cm. |
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Flowers | 15–20 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla white to slightly pink or lavender, banner erect, blade longer than 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 × 5–15 mm. |
35–65 × 6–12 mm. |
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Lathyrus laetivirens |
Lathyrus japonicus |
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Phenology | Flowering Apr–Jul. | |||||||||
Habitat | Flats, hillsides, sagebrush communities, pinyon-juniper, oak, pine, aspen and Douglas-fir forests. | |||||||||
Elevation | 1200–3200 m. (3900–10500 ft.) | |||||||||
Distribution |
AZ; CO; NM; NV; UT
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North America; Eurasia [Introduced in s South America]
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Discussion | C. L. Hitchcock (1952), S. L. Welsh et al. (1987), and D. Isely (1998) placed Lathyrus laetivirens within the L. lanszwertii complex, whereas R. C. Barneby (1989) treated it as a separate species. (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. lanszwertii var. laetivirens, L. leucanthus var. laetivirens | |||||||||
Name authority | Greene ex Rydberg: Fl. Colorado, 217. (1906) | Willdenow: Sp. Pl. 3: 1092. (1802) | ||||||||
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