WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 375 
9. Vicia sparsifolia Nutt.; Torr. & Gray, Fl. N. Amer. 1: 270. 1838. 
Type Locauity: “Plains of the Oregon.’’ 
Rance: Alberta and Montana to California and Kansas. 
New Mexico: Raton (Standley 6304). Open hills and plains, in the Upper Sonoran 
Zone. 
10. Vicia dissitifolia (Nutt.) Rydb. Bull. Torrey Club 83: 144. 1906. 
Lathyrus dissitifolius Nutt.; Torr. & Gray, Fl. N. Amer. 1: 277. 1838. 
TyprE LocaLity: Plains of the Platte. 
RANGE: Nebraska to northern New Mexico. 
New Mexico: Winsors Ranch; near Pecos. Mountains and hills, in the Transition 
Zone. 
26. LATHYRUS L. Wi pea. 
Low, mostly slender and short-stemmed herbs with pinnate leaves terminating in 
tendrils, or the tendrils much reduced or wanting; stems erect or climbing; similar to 
Vicia, but flowers usually larger, banner more recurved, and the style flattened near 
the apex and hairy only along the inner side. 
KEY TO THE SPECIES. 
Plants erect; tendrils none or much reduced. 
Plants conspicuously pubescent........---.--------------- 6. L. incanus. 
Plants glabrous. 
Flowers purple, 15 mm. long or more; leaflets thick.... 1. Z. decaphyllus. 
Flowers ochroleucous, 10 mm. long or less; leaflets thin. 
Leaflets oval to oblong. .......-..2-eeeeeeeeeee--- 2. L. leucanthus. 
Leaflets linear or nearly s0.............-22+++----- 7. L. arizonicus. 
Plants climbing by well-developed tendrils. 
Leaflets linear or nearly so.....-..--.--------------+-2--- 3. L. graminifolius. 
Leaflets elliptic to oval. 
Plants pubescent throughout; leaflets 35 to 45 mm. long. 4. L. oreophilus. 
Plants glabrous or nearly so; leaflets 20 mm, long or less. 5. L. parvifolius. 
1. Lathyrus decaphyllus Pursh, Fl. Amer. Sept. 471, 1814. 
Lathyrus polymorphus Nutt. Gen. Pl. 2: 96. 1818. 
Typr Locauitry: ‘‘On the banks of the Missouri.” 
Ranae: Idaho to Arizona and New Mexico. 
New Mexico: Farmington; Raton; Pecos; Las Vegas; Albuquerque; Sierra Grande; 
Chama River; Santa Fe; Chiz; Cliff; Gray; Zuni. Plains and open hills, in the Upper 
Sonoran Zone. 
The plant is a rather handsome one with much larger flowers than most of our 
species. In the northern part of the State it often becomes a weed in cultivated fields. 
2. Lathyrus leucanthus Rydb. Bull. Torrey Club 28: 37. 1901. 
TypE LocaLiTy: Ojo, Colorado. 
RanGe: Colorado and New Mexico. 
New Mexico: Chama; Santa Fe and Las Vegas mountains; Sandia Mountains; 
Organ Mountains; White and Sacramento mountains. Meadows, in the Transition 
Zone. 
An inconspicuous little plant, 10 to 20 cm. high, with few thin leaves without 
tendrils and few-flowered racemes of small white flowers. 
3. Lathyrus graminifolius (S, Wats.) White, Bull. Torrey Club 21: 454. 1894. 
Lathyrus palustris graminifolius 8. Wats. Proc. Amer, Acad, 23: 263. 1888. 
TypE Locauity: ‘Frequent from New Mexico to Arizona and northern Mexico.” 
Rance: California to New Mexico and Mexico. 
New Mexico: Mogollon Mountains; Magdalena Mountains; Ramah; Hanover 
Mountain; Rio Apache; Hillsboro Peak; White Mountains. Transition Zone. 
