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

singletary vetchling, tiny pea

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

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

narrowly winged, sprawling or climbing, basally branched 0–4 times, 3–6 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.

1–3 cm;

tendrils well developed;

stipules linear, 10–20 × 2–5 mm, equal to smaller leaflets;

leaflets 2, blades linear, 15–60 × 2–8 mm, surfaces glabrous.

Inflorescences

5–20-flowered, 5–25 cm.

terminal, 1- or 2-flowered, 2–4 cm.

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.

7–10 mm;

calyx lobes subequal, linear-triangular, usually longer than tube;

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

ovary glabrous.

Legumes

40–60 × 4–7 mm.

30–50 × 2–4 mm.

2n

= 14.

Lathyrus vestitus

Lathyrus pusillus

Phenology Flowering Mar–May.
Habitat Roadsides, pastures, prairies, open habitats.
Elevation 0–800 m. (0–2600 ft.)
Distribution
from USDA
w United States; nw Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; FL; KS; LA; MO; MS; NC; OK; TX; VA; South America (Argentina, Brazil, Chile, Ecuador, Paraguay, Peru, Uruguay)
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

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

Lathyrus pusillus, the only North American member of section Notolathyrus, a section centered in South America, is also the only annual species of Lathyrus native to North America. It is native to the southeastern United States; it has been cultivated as a forage crop in Oregon and occasionally escapes, but it has not become naturalized there.

(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. rigidus, L. sphaericus, 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) Elliott: Sketch Bot. S. Carolina 2: 223. (1823)
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