Lathyrus laetivirens
Lathyrus brownii
aspen pea, aspen peavine, aspen vetchling, plateau peavine, plateau vetchling
Brown's brush pea, Brown's pea, Brown's sweet pea
angled, sprawling to erect, basally branched 0–3 times, 2–8 dm.
angled, sprawling, basally branched 0–3 times, 2–5 dm.
3–8 cm;
tendrils well developed, often branched;
stipules lanceolate, 8–12 × 2–5 mm, much smaller than leaflets;
leaflets 6–10, usually paired, blades ovate, 20–40 × 10–20 mm, surfaces glabrous.
4–6 cm;
tendrils well developed;
stipules linear, 5–15 × 1–5 mm, much smaller than leaflets;
leaflets 6–10, scattered, blades ovate to linear, 15–40 × 1–10 mm, surfaces glabrous.
2–5-flowered, 4–7 cm.
2–4-flowered, 3–4 cm.
15–20 mm;
calyx lobes unequal, lateral lobes deltate, shorter than tube;
corolla white to slightly pink or lavender, banner erect, blade longer than claw, wings equal to keel;
ovary glabrous.
12–16 mm;
calyx lobes unequal, lateral lobes deltate, shorter than tube;
corolla purple, banner erect, blade longer than claw, wings longer than keel (by 1–3 mm);
ovary glabrous.
30–50 × 5–15 mm.
30–40 × 5–8 mm.
Lathyrus laetivirens
Lathyrus brownii
C. L. Hitchcock (1952), S. L. Welsh et al. (1987), and D. Isely (1998) placed Lathyrus laetivirens within the L. lanszwertii complex, whereas R. C. Barneby (1989) treated it as a separate species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Lathyrus brownii has been variously allied with L. pauciflorus (C. L. Hitchcock 1952) or with L. lanszwertii (R. C. Barneby 1989). It is distinct from L. pauciflorus by its smaller leaflets and flowers and by its range (northeastern California and adjacent Nevada and Oregon versus Colorado and Utah to Idaho, northeastern Oregon, and eastern Washington), and from L. lanszwertii by its larger flowers, smaller leaflets, general absence of pubescence, and its more typical prostrate, sprawling habit.
C. L. Hitchcock (1952) considered Lathyrus schaffneri Rydberg as described by L. Abrams and R. S. Ferris (1923–1960, vol. 2) to be referable to L. brownii.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CalFlora
WildflowerSearch
iNaturalist
USDA Plants Database
OR
Flora NW
PNW Herbaria
