370 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



20. OXYTROPIS DC. Loco weed. 



Like Astragalus in most particulars, but distinguished by the short subulate pro- 

 longation or beak of the keel. 



Several of the species are noxious loco weeds and do as much damage or more^ than 

 the species of Astragalus that pass under the same name. 



KEY TO THE SPECIES. 



Stipules free from the petiole; pods pendulous 1. 0. dejlexa. 



Stipules adnate to the petiole; pods erect. 



Leaflets many, subverticillate; flowers purple 2. 0. richardsoni. 



Leaflets few, not verticillate; flowers purple to white. 



Flowers 1 to 3 ; plants 10 cm . high or less 3. 0. jmrryi. 



Flowers numerous; plants more than 10 cm. high. 



Flowers purple 4. 0. lambertii. 



Flowers white, the keel often spotted with purple. 

 Plants tall, 30 cm. or more; inflorescence elon- 

 gated 5. 0. pinetorum. 



Plants low, 15 cm. or less; inflorescence short and 



dense 6. 0. vegana. 



1. Oxytropis deflexa (Pall.) A. DC. Astrag. 96. 1802. 

 Astragalm defiexus Pall. Act. Acad. Petrop. 3^: 268. jd. 15. 1779. 

 Aragalliis defiexus Heller, Cat. N. Amer. PI. 4. 1898. 



Type locality: Southern Siberia. 



Range: British America to Utah and New Mexico. 



New Mexico: Rio Pueblo; Chama. Damp woods, in the Canadian Zone. 



2. Oxytropis richardsoni (Hook.) Woot. & Standi. 



Oxytropis splendens richardsoni Hook. Fl. Bor. Amer. 1: 148. 1833. 



Aragallus richardsoni Greene, Pittonia 4: 69. 1899. 



Type locality: "From Cumberland-House on the Saskatchewan, north to Fort- 

 Franklin and the Bear Lake, and west to the dry Prairies of the Rocky Mountains." 



Range: British America to northern New Mexico. 



New Mexico: Santa Fe and Las Vegas mountains; Costilla Valley. High moun- 

 tain meadows, in the Canadian Zone. 



A very handsome plant, occurring in great abundance in parks in the Santa Fe 

 and Las Vegas ranges. 



3. Oxytropis parryi A. Gray, Proc. Amer. Acad. 20: 4. 1885. 

 Aragallus parryi Greene, Pittonia 3: 212. 1897. 



Type locality: "Rocky Mountains of Northern New Mexico and Colorado, near 

 the limit of trees." 



Range: Colorado and northern New Mexico. " 



New Mexico: Pecos Baldy (Bailey 616). High mountain meadows, in the Arctic- 

 Alpine Zone. 



4. Oyxtropis lambertii Pursh, Fl. Amer. Sept 740. 1814. 

 Aragallus lambertii Greene, Pittonia 3: 212. 1897. 



Aragallus metcalfei Greene, Proc. Biol. Soc. Washington 18: 12. 1905. 

 Type locality: "On the Missouri." 

 Range: British America to Arizona and Texas. 



New Mexico: Mountains and high plains nearly throughout the State. Meadows, 

 Upper Sonoran to Canadian Zone. 



