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bush vetchling, seemly pea

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

angled, erect, basally branched 0–2 times, 2–5 dm.

angled, erect or sprawling, basally branched 0–2 times, 1.5–3 dm.

Leaves

2–4 cm;

tendrils simple or branched, sometimes prehensile;

stipules linear, 5–15 × 1–2 mm, much smaller than leaflets;

leaflets 6 or 8, scattered, blades ovate to lanceolate, 15–45 × 4–10 mm, surfaces glabrous throughout or puberulent abaxially.

1–4 cm;

tendrils bristlelike, usually less than 1 cm;

stipules linear to lanceolate, 10–30 × 1–5 mm, nearly equal to leaflets;

leaflets 8–12, often paired, blades lanceolate to linear, 10–35 × 1–5 mm, surfaces glabrous or pubescent.

Inflorescences

2–4-flowered, 7–12 cm.

2–6-flowered, 4–11 cm.

Flowers

18–20 mm;

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

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

ovary glabrous.

16–22 mm;

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

corolla usually violet to magenta, sometimes white, banner erect, blade longer than claw, wings 4–5 mm longer than keel;

ovary glabrous.

Legumes

40–50 × 8–10 mm, short-stipitate.

35–50 × 8–12 mm, stipitate.

2n

= 14.

Lathyrus eucosmus

Lathyrus decaphyllus

Phenology Flowering Apr–Jun.
Habitat Dry soils in washes, pinyon-juniper woodlands, oak-brush, ponderosa pine forests, open prairies, grasslands.
Elevation 1200–2500 m. (3900–8200 ft.)
Distribution
from FNA
AZ; CO; NM; TX; UT; WY; Mexico (Coahuila)
[WildflowerSearch map]
[BONAP county map]
from USDA
wc United States
[BONAP county map]
Discussion

Lathyrus eucosmus is known from the northern two-thirds of Arizona northward to southeastern Utah, and eastward in southeastern Wyoming, Colorado, New Mexico, and Texas to the edge of the Great Plains.

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

Varieties 2 (2 in the flora).

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

Key
1. Herbs mostly glabrous.
var. decaphyllus
1. Herbs sparsely to densely villous.
var. incanus
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. 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. 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. 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. 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
Subordinate taxa
L. decaphyllus var. decaphyllus, L. decaphyllus var. incanus
Synonyms L. brachycalyx subsp. eucosmus, L. brachycalyx var. eucosmus
Name authority Butters & H. St. John: Rhodora 19: 160. (1917) Pursh: Fl. Amer. Sept. 2: 471. (1813)
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