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aspen pea, aspen peavine, aspen vetchling, plateau peavine, plateau vetchling

leafy pea, leafy peavine, Oregon pea

Habit Herbs perennial, from rhizome, glabrous. Herbs perennial, from rhizome, glabrous.
Stems

angled, sprawling to erect, basally branched 0–3 times, 2–8 dm.

angled, erect, sprawling, or climbing, basally branched 0–2 times, 4–8 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.

11–16 cm;

tendrils well developed;

stipules ovate to lanceolate, 20–30 × 10–30 mm, nearly equal to distal leaflets;

leaflets 10–16, scattered, blades ovate to lanceolate, 30–50 × 10–30 mm, surfaces glabrous.

Inflorescences

2–5-flowered, 4–7 cm.

8–12-flowered, 9–14 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.

15–18 mm;

calyx lobes unequal, lateral lobes linear-triangular, equal to or longer than tube;

corolla blue-purple, banner erect, blade longer than claw, wings equal to keel;

ovary glabrous.

Legumes

30–50 × 5–15 mm.

40–70 × 4–9 mm.

2n

= 14.

Lathyrus laetivirens

Lathyrus polyphyllus

Phenology Flowering Apr–Jul. Flowering Apr–Jul.
Habitat Flats, hillsides, sagebrush com­munities, pinyon-juniper, oak, pine, aspen and Douglas-fir forests. Openings in coniferous forests.
Elevation 1200–3200 m. (3900–10500 ft.) 0–1800 m. (0–5900 ft.)
Distribution
from FNA
AZ; CO; NM; NV; UT
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; WA
[WildflowerSearch map]
[BONAP county map]
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.)

Lathyrus polyphyllus is known from in and west of the Cascade Range. Lathyrus ecirrhosus A. Heller (1904), not Philippi (1892), is an illegitimate name that pertains here.

(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
L. angulatus, L. aphaca, L. biflorus, L. brachycalyx, L. brownii, L. cicera, L. decaphyllus, L. delnorticus, L. eucosmus, L. glandulosus, L. graminifolius, L. grimesii, L. hirsutus, L. hitchcockianus, L. holochlorus, L. japonicus, L. jepsonii, L. lanszwertii, L. latifolius, L. littoralis, L. nevadensis, L. nissolia, L. ochroleucus, L. odoratus, L. palustris, L. pauciflorus, L. polyphyllus, L. pratensis, L. pusillus, L. rigidus, L. sphaericus, L. splendens, L. sulphureus, L. sylvestris, L. tingitanus, L. torreyi, L. tracyi, L. tuberosus, L. venosus, L. vestitus
L. angulatus, L. aphaca, L. biflorus, L. brachycalyx, L. brownii, L. cicera, L. decaphyllus, L. delnorticus, L. eucosmus, L. glandulosus, L. graminifolius, L. grimesii, L. hirsutus, L. hitchcockianus, L. holochlorus, L. japonicus, L. jepsonii, L. laetivirens, L. lanszwertii, L. latifolius, L. littoralis, L. nevadensis, L. nissolia, L. ochroleucus, L. odoratus, L. palustris, L. pauciflorus, L. pratensis, L. pusillus, L. rigidus, L. sphaericus, L. splendens, L. sulphureus, L. sylvestris, L. tingitanus, L. torreyi, L. tracyi, L. tuberosus, L. venosus, L. vestitus
Synonyms L. lanszwertii var. laetivirens, L. leucanthus var. laetivirens
Name authority Greene ex Rydberg: Fl. Colorado, 217. (1906) Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 274. (1838)
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