Flora of North America species comparison

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Lathyrus tracyi

Tracy's pea, Tracy's sweet pea
Habit Herbs perennial, from rhizome, glabrous or pubescent.
Stems

angled, erect, sprawling, or climbing, often branched mid stem 1–4 times, 2–6 dm.
Leaves

2–6 cm;

tendrils absent to well developed, 0–3 cm, usually not branched;

stipules linear, 5–15 × 1–5 mm, much smaller than leaflets;

leaflets 4–8, often paired, blades ovate, 15–30 × 5–20 mm, surfaces glabrous, or linear, 30–70 × 1–10 mm, surfaces glabrous or pubescent.
Inflorescences

5–15-flowered, 2–7 cm.
Flowers

7–13 mm;

calyx lobes unequal, lateral lobes often linear-triangular, sometimes lanceolate, shorter than tube;

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

ovary glabrous.
Legumes

40–60 × 4–7 mm.
2n

= 14.

Lathyrus tracyi
Phenology Flowering Apr–Jun.
Habitat Roadsides, open coniferous and mixed evergreen forests.
Elevation 300–1300 m. (1000–4300 ft.)
Distribution
from FNA
CA
Discussion

Although W. L. Jepson (1909–1943, vol. 2) treated Lathyrus tracyi of northwestern California as a variety of L. bolanderi S. Watson (= L. vestitus), D. Isely (1992, 1998) considered L. tracyi a variety of L. lanszwertii. Lathyrus tracyi includes both ovate- and linear-leaflet forms. Linear-leaflet populations certainly suggest a relationship to L. lanszwertii, but ovate-leaflet forms, the presence of mid stem branching, and differences in floral structures suggest that L. tracyi may be better allied to L. holochlorus found to the north in the Willamette Valley of western Oregon and southwestern Washington. Lathyrus tracyi has been reported from Jackson County, Oregon, but specimens could not be examined.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa 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. torreyi, L. tuberosus, L. venosus, L. vestitus
Synonyms L. bolanderi var. tracyi, L. lanszwertii var. tracyi
Name authority Bradshaw: Bot. Gaz. 80: 245. (1925)
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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