370 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
20. OXYTROPIS DC. Loco weep. 
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. O. deflexa. 
Stipules adnate to the petiole; pods erect. 
Leaflets many, subverticillate; flowers purple................ 2. O. richardsoni. 
Leaflets few, not verticillate; flowers purple to white. 
Flowers | to 3; plants 10 cm. high or less.................. 3. O. parryi. 
Flowers numerous; plants more than 10 cm. high. 
Flowers purple.......2..2.2.2......0..00022 222 e ee eee 4. O, lambertii. 
Flowers white, the keel often spotted with purple. 
Plants tall, 30 cm. or more; inflorescence elon- 
gated..... wee eee eee eee eee eee eee eee eee 5. O. pinetorum. 
Plants low, 15 cm. or less; inflorescence short and 
dense... ..2.22..2222 2-222 e eee eee eeeeeee 6. O. vegana. 
1. Oxytropis deflexa (Pall.) A. DC. Astrag. 96. 1802. 
Astragalus deflerus Pall. Act. Acad. Petrop. 37: 268. pl. 15. 1779. 
Aragallus deflecus Heller, Cat. N. Amer. Pl. 4. 1898. 
TYPE LOCALITY: Southern Siberia. 
Rance: British America to Utah and New Mexico. 
New Mexico: Rio Pueblo; Chama. Damp woods, in the Canadian Zone. 
2. Oxytropis richardsoni (Hook.) Woot. & Stand. 
Oxytropis splendens richardsoni Hook. Fl. Bor. Amer. 1: 148, 1833. 
Aragallus richardsoni Greene, Pittonia 4: 69. 1899. 
Type Locauity: “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 Loca.iry: ‘Rocky Mountains of Northern New Mexico and Colorado, near 
the limit of trees.”’ 
RanGE: Colorado and northern New Mexico. 
New Mexico: Pecos Baldy (Batley 616). High mountain meadows, in the Arctic- 
Alpine Zone. ; 
4. Oyxtropis lambertii Pursh, Fl. Amer. Sept. 740. 1814. 
Aragallus lambertit Greene, Pittonia 3: 212. 1897. 
Aragallus metcal fei Greene, Proc. Biol. Soc. Washington 18: 12. 1905. 
TYPE Locaity: ‘‘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, 
