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bushy vetchling, veiny pea, veiny peavine

grass-leaf pea

Habit Herbs perennial, from rhizome, glabrous or pubescent. Herbs perennial, from rhizome or woody rootstock, glabrous.
Stems

angled, sprawling or climbing, basally branched 0–3 times, 4–10 dm.

angled, sprawling or climbing, sometimes branched at flowering nodes, 2–6 dm.

Leaves

6–18 cm;

tendrils well developed;

stipules lanceolate to linear, 10–20 × 2–10 mm, much smaller than distal leaflets (less than 1/4 width of distal leaflets);

leaflets 8–14, scattered, blades ovate to lanceolate, 25–70 × 10–35 mm, surfaces glabrous or pubescent.

5–9 cm;

tendrils usually well developed;

stipules lanceolate to linear, 8–12 × 1–5 mm, much smaller than leaflets;

leaflets 4–8, scattered, blades usually linear, rarely lanceolate, 30–80 × 1–20 mm, surfaces glabrous.

Inflorescences

5–20-flowered, 6–20 cm.

5–8-flowered, 10–18 cm.

Flowers

10–15 mm;

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

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

ovary glabrous or pubescent.

8–15 mm;

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

corolla white to blue-orchid, banner erect, blade equal to claw, wings equal to keel;

ovary glabrous.

Legumes

20–50 × 3–7 mm.

30–50 × 4–8 mm.

2n

= 14.

Lathyrus venosus

Lathyrus graminifolius

Phenology Flowering Apr–Aug.
Habitat Slopes of ponderosa pine, mixed conifer, spruce-fir and oak-juniper forests.
Elevation 1000–2800 m. (3300–9200 ft.)
Distribution
from USDA
North America
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX; Mexico (Chihuahua, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

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

Lathyrus graminifolius is known from the eastern half of Arizona to the western two-thirds of New Mexico and in trans-Pecos Texas.

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

Key
1. Herbs sparsely to densely pubescent.
var. intonsus
1. Herbs glabrous.
→ 2
2. Calyces: lateral lobes linear-triangular, equal to or shorter than tubes.
var. venosus
2. Calyces: lateral lobes lanceolate, longer than tubes.
var. arkansanus
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. 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. vestitus
L. angulatus, L. aphaca, L. biflorus, L. brachycalyx, L. brownii, L. cicera, L. decaphyllus, L. delnorticus, L. eucosmus, L. glandulosus, 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. venosus var. arkansanus, L. venosus var. intonsus, L. venosus var. venosus
Synonyms L. palustris var. graminifolius
Name authority Muhlenberg ex Willdenow: Sp. Pl. 3: 1092. (1802) (S. Watson) T. G. White: Bull. Torrey Bot. Club 21: 454. (1894)
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