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beach or maritime or sand pea, beach pea, beach vetchling, maritime pea, sea pea, seaside pea

bushy pea, Modoc pea, rigid pea, stiff pea, stiff peavine

Habit Herbs perennial, from rhizome, glabrous or sparsely pubescent. Herbs perennial, from rootstock, glabrous.
Stems

angled to narrowly winged, erect, sprawling, or climbing, basally branched 0–4 times, 1–10 dm.

angled, erect, basally branched 5–10 times, 1–3 dm.

Leaves

3–15 cm;

tendrils usually well developed, branched or unbranched;

stipules sagittate-ovate, 7–35 × 7–30 mm, as large as basal leaflets;

leaflets 6–12, usually scattered, blades ovate to lanceolate, 15–55 × 5–35 mm, surfaces glabrous throughout or pubescent abaxially.

1–3 cm;

tendrils bristlelike, less than 1 cm;

stipules lanceolate, 10–15 × 1–8 mm, equal to distal leaflets;

leaflets 4–8, paired, blades lanceolate, 15–30 × 5–10 mm, surfaces glabrous.

Inflorescences

4–9-flowered, 4–15 cm.

2- or 3-flowered, 4–9 cm.

Flowers

12–29 mm;

calyx lobes unequal, lateral lobes linear-triangular, longer than tube;

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

ovary eglandular and glandular-pubescent.

12–18 mm;

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

corolla white to lilac, banner erect, blade longer than claw, wings longer than keel;

ovary glabrous.

Legumes

35–65 × 6–12 mm.

20–40 × 5–10 mm, stipitate.

2n

= 14.

Lathyrus japonicus

Lathyrus rigidus

Phenology Flowering Apr–Jun.
Habitat Basalt scablands with sagebrush.
Elevation 800–1700 m. (2600–5600 ft.)
Distribution
from USDA
North America; Eurasia [Introduced in s South America]
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; ID; NV; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

Within Lathyrus japonicus, in the narrow sense, there is a south to north reduction in plant size, including plant height, robustness, and leaflet size, but not flower size, flower number, or fruit size. On the east coast of North America this shift seems fairly abrupt, giving the appearance of a clear distinction between var. maritimus and var. pellitus in the south, and var. japonicus to the north in Labrador and Greenland. However, on the West Coast, there are few truly pubescent forms (var. pellitus), and there seem to be many more intermediates between var. maritimus in the south and var. japonicus to the north.

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

Key
1. Stems 1–3.5 dm; leaflet blades 15–35 mm; tendrils unbranched, less than 3 cm.
var. japonicus
1. Stems 3–10 dm; leaflet blades 30–50(–55) mm; tendrils branched, 3+ cm.
→ 2
2. Leaflet blades glabrous.
var. maritimus
2. Leaflet blades pubescent abaxially (especially new growth).
var. pellitus
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. 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. 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. sphaericus, L. splendens, L. sulphureus, L. sylvestris, L. tingitanus, L. torreyi, L. tracyi, L. tuberosus, L. venosus, L. vestitus
Subordinate taxa
L. japonicus var. japonicus, L. japonicus var. maritimus, L. japonicus var. pellitus
Synonyms L. albus
Name authority Willdenow: Sp. Pl. 3: 1092. (1802) T. G. White: Bull. Torrey Bot. Club 21: 455. (1894)
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