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redwood pea, Torrey's pea, Torrey's peavine

two-flower pea, two-flower sweet pea

Habit Herbs perennial, from rhizome, finely villous. Herbs perennial, from rhizome, villous.
Stems

angled, erect to sprawling, basally branched 0–3 times, 1–4 dm.

angled, erect or sprawling, basally branched 1–3 times, 0.5–1 dm.

Leaves

2–7 cm;

tendrils absent or mucronate;

stipules lanceolate, 7–12 × 2–5 mm, much smaller than leaflets;

leaflets 8–16, scattered, blades ovate to lanceolate, 5–15 × 3–10 mm, surfaces villous.

0.5–1 cm;

tendrils absent or reduced to flattened bristles;

stipules linear, 4–5 × 1–2 mm, ca. 1/2 length of leaflets;

leaflets (3 or)4(or 5), paired, blades lanceolate, 6–12 × 2–3 mm, surfaces finely villous.

Inflorescences

1- or 2-flowered, 0.5–3 cm.

1- or 2-flowered, 1 cm.

Flowers

8–12 mm;

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

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

ovary densely pubescent.

7–8 mm;

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

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

ovary glabrous.

Legumes

15–20 × 4–5 mm.

13–15 × 3–5 mm.

2n

= 14.

Lathyrus torreyi

Lathyrus biflorus

Phenology Flowering Apr–Jul. Flowering Jun.
Habitat Open coniferous forests. Serpentine outcrops and Jeffrey pine woodlands.
Elevation 50–1500 m. (200–4900 ft.) 1300–1400 m. (4300–4600 ft.)
Distribution
from FNA
CA; OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

Lathyrus torreyi is known from in and west of the Cascade Range; it is very rare in Washington.

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

Lathyrus biflorus is known only from southeastern Humboldt County.

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

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. tracyi, L. tuberosus, L. venosus, L. vestitus
L. angulatus, L. aphaca, 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. vestitus
Name authority A. Gray: Proc. Amer. Acad. Arts 7: 337. (1868) T. W. Nelson & J. P. Nelson: Brittonia 35: 183, fig. 2. (1983)
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