Flora of North America species comparison

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Lathyrus lanszwertii var. aridus

Lathyrus lanszwertii
Photo is of parent taxon

dryland Nevada pea, Nevada pea, pinewoods peavine

aspen peavine, lanszwert's pea, lanszwert's vetchling, Nevada pea, Nevada peavine, Nevada sweet pea, pinewood peavine, Rocky Mountain sweetpea, thick-leaf pea, thick-leaf peavine
Habit Herbs perennial, from rhizome, glabrous or sparsely pubescent.
Stems

erect, 1–3 dm.

angled, erect, sprawling, or climbing, basally branched 0–4 times, 1–8 dm.
Leaves

2–4 cm, terminating in simple bristle, usually less than 1 cm;

leaflets 4–8, blades linear, 20–40 × 2–5 mm.

(0.5–)1–8 cm;

tendrils mucronate to well developed;

stipules linear to lanceolate, 5–25 × 1–6 mm, much smaller than leaflets;

leaflets 2–10, scattered, blades lanceolate or linear, 20–70 × 2–20 mm, surfaces glabrous or sparsely pubescent.
Inflorescences

2–4 cm.

2–6-flowered, 2–10 cm.
Flowers

7–10 mm, corolla white.

7–15 mm;

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

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

ovary glabrous.
Legumes

25–45 × 6–10 mm.
2n

= 14.

Lathyrus lanszwertii var. aridus

Lathyrus lanszwertii
Phenology Flowering Apr–Jun.
Habitat Open ponderosa pine wood­lands, adjacent sagebrush steppes.
Elevation 800–2000 m. (2600–6600 ft.)
Distribution
from FNA
CA; NV; OR; WA
[BONAP county map]
from USDA
w North America
[WildflowerSearch map]
[BONAP county map]
Discussion

Variety aridus is known from the eastern flanks of the Sierra Nevada in California and western Nevada and in the Cascade Range north to south-central Washington. It appears to intergrade with var. lanszwertii in central Washington and Oregon.

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

Varieties 5 (5 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Stems (2–)3–8 dm, usually climbing, sometimes sprawling or erect; tendrils well developed, usually branched.
→ 2
2. Leaflets 8–10; corollas blue-purple; California northward to Washington, eastward to Colorado and Wyoming.
var. lanszwertii
2. Leaflets 6–8; corollas white; w Colorado, c Utah, Wyoming.
var. pallescens
1. Stems 1–3(–4) dm, usually erect (sometimes var. bijugatus sprawling or climbing); tendrils reduced to simple bristles less than 1 cm.
→ 3
3. Leaflets 2–4; e Washington, adjacent Idaho, Montana, British Columbia.
var. bijugatus
3. Leaflets 4–8; California northward to sc Washington and eastward to New Mexico, Colorado, and Wyoming.
→ 4
4. Flowers 7–10 mm; California, Nevada, Oregon, Washington.
var. aridus
4. Flowers 10–15 mm; Arizona, Colorado, New Mexico, Utah, Wyoming.
var. leucanthus
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Lathyrus > Lathyrus lanszwertii Fabaceae > subfam. Faboideae > Lathyrus
Sibling taxa
L. lanszwertii var. bijugatus, L. lanszwertii var. lanszwertii, L. lanszwertii var. leucanthus, L. lanszwertii var. pallescens
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. 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. lanszwertii var. aridus, L. lanszwertii var. bijugatus, L. lanszwertii var. lanszwertii, L. lanszwertii var. leucanthus, L. lanszwertii var. pallescens
Synonyms L. coriaceus subsp. aridus, L. lanszwertii subsp. aridus
Name authority (Piper) Jepson: Fl. Calif. 2: 389. (1936) Kellogg: Proc. Calif. Acad. Sci. 2: 150, fig. 44. (1863)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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