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purple peavine, Sierra Nevada pea, Sierra Nevada sweet pea, Sierra pea, Sierra peavine

cream pea, cream vetchling, cream-flower peavine, cream-flower sweet pea, creamy peavine, pale vetchling

Habit Herbs perennial, from rhizome, pubescent except glabrous on legumes and leaflets adaxially. Herbs perennial, from rhizome, glabrous except calyx ciliate.
Stems

angled, erect, sprawling, or climbing, basally branched 0–several times, 1–6 dm.

angled, sprawling or climbing, basally branched 0–3 times, 3–8 dm.

Leaves

2–10 cm;

tendrils mucronate (less than 1 cm) to well developed;

stipules linear, 5–25 × 1–8 mm, much smaller than leaflets;

leaflets 4–12, usually scattered, blades broadly ovate to lanceolate or linear, (17–)20–110 × 2–30(–37) mm, surfaces usually glabrous, rarely finely pubescent.

(2–)3–10 cm;

tendrils well developed;

stipules somewhat foliose, ovate-lanceolate, 15–35 × 5–20 mm, sometimes equal to distal leaflets;

leaflets (5 or)6(–8), usually paired, blades broadly ovate to lanceolate, (20–)25–65 × 10–35(–42) mm, surfaces glabrous.

Inflorescences

2–10-flowered, 3–15 cm.

4–10(–13)-flowered, 3–12 cm.

Flowers

12–22 mm;

calyx lobes unequal, lateral lobes deltate, usually shorter than tube;

corolla blue-purple to pink-purple or white, banner erect, blade longer than claw, wings equal to keel;

ovary glabrous.

10–15 mm;

calyx lobes unequal, lateral lobes lanceolate, usually longer than tube;

corolla cream-white, banner erect, blade longer than claw, wings equal to keel;

ovary glabrous.

Legumes

20–30(–45) × 5–10 mm.

30–70 × 4–7 mm.

2n

= 14.

Lathyrus nevadensis

Lathyrus ochroleucus

Phenology Flowering Apr–Jul.
Habitat Moist woodlands, clearings, thickets, glades, meadows.
Elevation 0–1500 m. (0–4900 ft.)
Distribution
from USDA
w North America
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; IA; ID; IL; IN; MI; MN; MT; ND; NE; NJ; NY; OH; PA; SD; VT; WA; WI; WV; WY; AB; BC; MB; NT; NU; ON; QC; SK; YT
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

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

Key
1. Corollas blue-purple to pink-purple; British Columbia, California, w Oregon, w, c Washington.
var. nevadensis
1. Corollas white; ne Oregon, e Washington, adja­cent Idaho.
→ 2
2. Leaves 4–10 cm; leaflets 6–10; tendrils well developed; flowers 5–10, 12–18 mm.
var. parkeri
2. Leaves 2–5 cm; leaflets 4 or 6; tendrils reduced to bristles, (usually less than 1 cm); flowers 2–4, 18–22 mm.
var. cusickii
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. 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. nissolia, 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. nevadensis var. cusickii, L. nevadensis var. nevadensis, L. nevadensis var. parkeri
Synonyms L. nevadensis subsp. stipulaceus
Name authority S. Watson: Proc. Amer. Acad. Arts 11: 133. (1876) Hooker: Fl. Bor.-Amer. 1: 159. (1831)
Web links