Lathyrus laetivirens |
Lathyrus tracyi |
|
---|---|---|
aspen pea, aspen peavine, aspen vetchling, plateau peavine, plateau vetchling |
Tracy's pea, Tracy's sweet pea |
|
Habit | Herbs perennial, from rhizome, glabrous. | Herbs perennial, from rhizome, glabrous or pubescent. |
Stems | angled, sprawling to erect, basally branched 0–3 times, 2–8 dm. |
angled, erect, sprawling, or climbing, often branched mid stem 1–4 times, 2–6 dm. |
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. |
2–6 cm; tendrils absent to well developed, 0–3 cm, usually not branched; stipules linear, 5–15 × 1–5 mm, much smaller than leaflets; leaflets 4–8, often paired, blades ovate, 15–30 × 5–20 mm, surfaces glabrous, or linear, 30–70 × 1–10 mm, surfaces glabrous or pubescent. |
Inflorescences | 2–5-flowered, 4–7 cm. |
5–15-flowered, 2–7 cm. |
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. |
7–13 mm; calyx lobes unequal, lateral lobes often linear-triangular, sometimes lanceolate, shorter than tube; corolla white, banner erect, blade equal to claw, wings equal to keel; ovary glabrous. |
Legumes | 30–50 × 5–15 mm. |
40–60 × 4–7 mm. |
2n | = 14. |
|
Lathyrus laetivirens |
Lathyrus tracyi |
|
Phenology | Flowering Apr–Jul. | Flowering Apr–Jun. |
Habitat | Flats, hillsides, sagebrush communities, pinyon-juniper, oak, pine, aspen and Douglas-fir forests. | Roadsides, open coniferous and mixed evergreen forests. |
Elevation | 1200–3200 m. (3900–10500 ft.) | 300–1300 m. (1000–4300 ft.) |
Distribution |
AZ; CO; NM; NV; UT
|
CA |
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.) |
Although W. L. Jepson (1909–1943, vol. 2) treated Lathyrus tracyi of northwestern California as a variety of L. bolanderi S. Watson (= L. vestitus), D. Isely (1992, 1998) considered L. tracyi a variety of L. lanszwertii. Lathyrus tracyi includes both ovate- and linear-leaflet forms. Linear-leaflet populations certainly suggest a relationship to L. lanszwertii, but ovate-leaflet forms, the presence of mid stem branching, and differences in floral structures suggest that L. tracyi may be better allied to L. holochlorus found to the north in the Willamette Valley of western Oregon and southwestern Washington. Lathyrus tracyi has been reported from Jackson County, Oregon, but specimens could not be examined. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Lathyrus | Fabaceae > subfam. Faboideae > Lathyrus |
Sibling taxa | ||
Synonyms | L. lanszwertii var. laetivirens, L. leucanthus var. laetivirens | L. bolanderi var. tracyi, L. lanszwertii var. tracyi |
Name authority | Greene ex Rydberg: Fl. Colorado, 217. (1906) | Bradshaw: Bot. Gaz. 80: 245. (1925) |
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