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grass-leaf pea

two-flower pea, two-flower sweet pea

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

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

angled, erect or sprawling, basally branched 1–3 times, 0.5–1 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.

0.5–1 cm;

tendrils absent or reduced to flattened bristles;

stipules linear, 4–5 × 1–2 mm, ca. 1/2 length of leaflets;

leaflets (3 or)4(or 5), paired, blades lanceolate, 6–12 × 2–3 mm, surfaces finely villous.

Inflorescences

5–8-flowered, 10–18 cm.

1- or 2-flowered, 1 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.

7–8 mm;

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

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

ovary glabrous.

Legumes

30–50 × 4–8 mm.

13–15 × 3–5 mm.

2n

= 14.

Lathyrus graminifolius

Lathyrus biflorus

Phenology Flowering Apr–Aug. Flowering Jun.
Habitat Slopes of ponderosa pine, mixed conifer, spruce-fir and oak-juniper forests. Serpentine outcrops and Jeffrey pine woodlands.
Elevation 1000–2800 m. (3300–9200 ft.) 1300–1400 m. (4300–4600 ft.)
Distribution
from FNA
AZ; NM; TX; Mexico (Chihuahua, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[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.)

Lathyrus biflorus is known only from southeastern Humboldt County.

(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. 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. venosus, L. vestitus
Synonyms L. palustris var. graminifolius
Name authority (S. Watson) T. G. White: Bull. Torrey Bot. Club 21: 454. (1894) T. W. Nelson & J. P. Nelson: Brittonia 35: 183, fig. 2. (1983)
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