WOOTON AND STANDLEY FLORA OF NEW MEXICO. 375 



9. Vicia sparsifoHa Nutt.; Torr. & Gray, Fl. N. Amer. 1: 270. 1838. 

 Type locality: "Plains of the Oregon." 



Range: Alberta and Montana to California and Kansas. 



New Mexico : Raton {Standley 6304). Open hills and plains, in the Upper Sonoran 

 Zone. 



10. Vicia dissitifoUa (Nutt.) Rydb. Bull. Torrey Club 33: 144. 1906. 

 Lathyrus dissitifolius Nutt.; Torr. & Gray, Fl. N. Amer. 1: 277. 1838. 

 Type 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. Wild 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. L. decaphyllus. 



Flowers ochroleucous, 10 mm. long or less; leaflets thin. 



Leaflets oval to oblong 2. L. leucanthus. 



Leaflets linear or nearly so 7. L. arizonicus. 



Plants climbing by well-developed tendrils. 



Leaflets linear or nearly so 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 decaphyUus Pursh, Fl. Amer. Sept. 471. 1814. 

 Lathyrus polymorphus Nutt. Gen. PI. 2: 96. 1818. 



Type locality: "On the banks of the Missouri." 



Range: 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 graminifoHus (S. Wats.) White, Bull. Torrey Club 21: 454. 1894. 

 Lathyrus palustris graminifolius S. Wats. Proc. Amer. Acad. 23: 263. 1888. 



Type locality: "Frequent from New Mexico to Arizona and northern Mexico." 

 Range: California to New Mexico and Mexico. 



New Mexico: Mogollon Mountains; Magdalena Mountains; Ramah; Hanover 

 Mountain; Rio Apache; Hillsboro Peak; White Mountains. Transition Zone. 



