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leafy pea, leafy peavine, Oregon pea

bullfrog mountain pea, Grapevine Mountains pea, Hitchcock's sweet pea

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

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

angled, erect or sprawling, basally branched 3–5 times, 1–3 dm.

Leaves

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.

3–4 cm;

tendrils well developed;

stipules linear, 5–10 × 1–2 mm, much smaller than leaflets;

leaflets 4 or 6, paired, blades linear, 15–50 × 1–5 mm, surfaces sparsely pubescent.

Inflorescences

8–12-flowered, 9–14 cm.

2 or 3-flowered, 3–6 cm.

Flowers

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.

8–10 mm;

calyx lobes unequal, lateral lobes deltate, shorter than tube;

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

ovary glabrous.

Legumes

40–70 × 4–9 mm.

40–70 × 4–9 mm.

2n

= 14.

Lathyrus polyphyllus

Lathyrus hitchcockianus

Phenology Flowering Apr–Jul. Flowering Apr–May.
Habitat Openings in coniferous forests. Washes in sagebrush or pinyon-juniper woodlands.
Elevation 0–1800 m. [0–5900 ft.] 1200–2100 m. [3900–6900 ft.]
Distribution
from FNA
CA; OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; NV
[BONAP county map]
Discussion

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.)

Lathyrus hitchcockianus is known only from the Bullfrog Hills and Yucca Mountain in Nye County, Nevada, and the Grapevine Mountains of adjacent Inyo County, California.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11. FNA vol. 11. Treatment author: Steven L. Broich.
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. 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
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. 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. 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
Name authority Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 274. (1838) Barneby & Reveal: Aliso 7: 362. (1971)
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