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grass-leaf pea

grass pea, grass vetchling

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

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

not winged, erect or sprawling, basally branched 1–several times, 1–8 dm.

Leaves

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.

phyllodic;

tendrils absent;

stipules filiform-linear, 1–2 × 1 mm, much smaller than phyllode, base semisaggitate;

leaflets 0;

phyllodes flattened, linear, and grasslike, 80–140 × 4–10 mm, glabrous.

Inflorescences

5–8-flowered, 10–18 cm.

1- or 2-flowered, 6–10 cm.

Flowers

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.

8–10 mm;

calyx lobes equal, lateral lobes deltate, equal to tube;

corolla crimson, banner erect, blade equal to claw, wings equal to keel;

ovary glabrous or pubescent.

Legumes

30–50 × 4–8 mm.

30–60 × 2–4 mm.

2n

= 14.

= 14.

Lathyrus graminifolius

Lathyrus nissolia

Phenology Flowering Apr–Aug. Flowering Apr–May.
Habitat Slopes of ponderosa pine, mixed conifer, spruce-fir and oak-juniper forests. Disturbed areas, grassy mead­ows.
Elevation 1000–2800 m. (3300–9200 ft.) 50–150 m. (200–500 ft.)
Distribution
from FNA
AZ; NM; TX; Mexico (Chihuahua, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
OR; WA; Europe [Introduced in North America; introduced also in n Africa]
[BONAP county map]
Discussion

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.)

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. 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. 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. 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
Synonyms L. palustris var. graminifolius
Name authority (S. Watson) T. G. White: Bull. Torrey Bot. Club 21: 454. (1894) Linnaeus: Sp. Pl. 2: 729. (1753)
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