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canyon pea, common Pacific pea, Pacific pea, Pacific peavine, Pacific vetchling, wild sweetpea

grass pea, grass peavine

Habit Herbs perennial, from rhizome, glabrous or sparsely to densely pubescent. Herbs annual, glabrous.
Stems

angled to narrowly winged, sprawling or climbing, basally branched 0–4 times, 2–20 dm.

not winged, erect, sprawling or climbing, basally branched 1–several times, 2–5 dm.

Leaves

4–14 cm;

tendrils well developed;

stipules lanceolate to linear, 5–25 × 1–10 mm, much smaller than leaflets (more than 1/4 width of distal leaflets);

leaflets 6–12, scattered, blades ovate to linear, 12–50 × 5–25 mm, surfaces glabrous or pubescent.

0.5–1.5 cm;

tendrils bristlelike to 4 cm, often unbranched;

stipules linear, 10–15 × 2–10 mm, much smaller than leaflets;

leaflets 2, blades linear, 20–90 × 2–10 mm, surfaces glabrous.

Inflorescences

5–20-flowered, 5–25 cm.

1-flowered, 1–2 cm, prolonged beyond flower into a bristle.

Flowers

12–25 mm;

calyx lobes unequal, lateral lobes deltate, linear-triangular, or lanceolate and wider distal to base, shorter to longer than tube;

corolla cream-white, rose, lavender, blue-purple, or deep wine red, banner erect or reflexed toward calyx tube, blade equal to or longer than claw, wings equal to keel;

ovary glabrous or pubescent.

6–10 mm;

calyx lobes subequal, lateral lobes lanceolate, longer than tube;

corolla reddish orange, banner erect, blade longer than or equal to claw, wings equal to keel;

ovary glabrous.

Legumes

40–60 × 4–7 mm.

40–60 × 4–6 mm, longitudinal venation prominent.

2n

= 14.

Lathyrus vestitus

Lathyrus sphaericus

Phenology Flowering Apr–Jul.
Habitat Roadsides, pastures, waste areas.
Elevation 0–500 m. (0–1600 ft.)
Distribution
from USDA
w United States; nw Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; WA; BC; Europe [Introduced in North America; introduced also in Mexico, Asia, Pacific Islands (New Zealand), Australia]
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

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

Key
1. Flowers 16–25 mm, corollas dark wine red, ban­ners reflexed against calyx tube.
var. alefeldii
1. Flowers 12–17 mm, corollas cream-white, rose, lavender, or blue-purple, banners erect.
→ 2
2. Leaflet blades often sparsely to densely pubes­cent throughout, sometimes pubescent abax­ially, glabrous adaxially; flowers rose, lavender, or blue-purple; California, sw Oregon.
var. vestitus
2. Leaflet blades glabrous; flowers cream-white; Puget Sound area to sw Oregon and nw California.
var. ochropetalus
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. venosus
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. splendens, L. sulphureus, L. sylvestris, L. tingitanus, L. torreyi, L. tracyi, L. tuberosus, L. venosus, L. vestitus
Subordinate taxa
L. vestitus var. alefeldii, L. vestitus var. ochropetalus, L. vestitus var. vestitus
Name authority Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 276. (1838) Retzius: Observ. Bot. 3: 39. (1783)
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