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delta tule pea, Jepson's pea, Jepson's sweet pea, tule pea

Bonneville pea, Bonneville peavine, Bonneville vetchling, Rydberg's peavine

Habit Herbs perennial, from rhizome, glabrous or pubescent. Herbs perennial, from rhizome, glabrous or villous.
Stems

winged, sprawling or climbing, basally branched 0–3 times, 4–25 dm.

angled, erect, sprawling, or climbing, basally branched 0–3 times, 1–5 dm.

Leaves

5–15 cm;

tendrils well developed;

stipules narrowly lanceolate to linear, 10–25 × 2–6 mm, much smaller than leaflets;

leaflets 8–12, scattered, blades lanceolate, 20–60 × 4–20 mm, surfaces glabrous or pubescent.

2–9 cm;

tendrils usually well developed, sometimes reduced to a single bristle;

stipules lanceolate, 5–12 × 1–3 mm, much smaller than leaflets;

leaflets 6–12, scattered, blades elliptic to narrowly so, 8–70 × 3–8 mm, surfaces glabrous or villous.

Inflorescences

5–15-flowered, 6–16 cm.

2–5-flowered, 5–15 cm.

Flowers

14–17 mm;

calyx lobes unequal, lateral lobes linear-triangular, equal to tube;

corolla pale pink to rose-purple, banner erect, blade longer than claw, wings equal to keel;

ovary glabrous.

13–20 mm;

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

corolla pinkish to deep blue-purple, banner erect, blade nearly 2 times as long as claw, wings equal to keel;

ovary glabrous.

Legumes

50–90 × 6–9 mm.

30–40 × 6–8 mm.

Lathyrus jepsonii

Lathyrus brachycalyx

Distribution
from USDA
California
[WildflowerSearch map]
[BONAP county map]
from USDA
w United States
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

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

Varieties 2 (2 in the flora).

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

Key
1. Herbs glabrous; of marshes and wetlands.
var. jepsonii
1. Herbs pubescent; of drier upland sites.
var. californicus
1. Stems 1–3 dm, erect; herbs mostly villous throughout; banners shallowly cordate.
var. brachycalyx
1. Stems 3–5 dm, sprawling or climbing; herbs gla­brous or sparsely villous; banners deeply cordate.
var. zionis
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. 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. 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
Subordinate taxa
L. jepsonii var. californicus, L. jepsonii var. jepsonii
L. brachycalyx var. brachycalyx, L. brachycalyx var. zionis
Name authority Greene: Pittonia 2: 158. (1890) — (as jepsoni) Rydberg: Bull. Torrey Bot. Club 34: 425. (1907)
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