THE PERENNIAL SCAPOSE DRABAS OF NORTH AMERICA 259 
6. D. DouGLASii Gray, Proc. Amer. Acad. 7: 328. 1867. 
Braya oregonensis Gray, Proc- Amer. Acad. 17: 199. 1882. 
Cusickia Gray, 1. c. 
D. Crockeri Lemmon, Bull. Torrey Club 16: 221. 1889. 
Specimens Examined. — California: Sierras of California, Lemmon. 
Oregon: Dry, stony hills, eastern Oregon, May 24, 1898, Cusick, 
no. 1883. Utah: 1858-59, H. Engelmann. This speciman is re- 
ferred here very doubtfully. It is however too immature to make 
determination certain. 
7. Draba Nelsonii Macbride & Pay son, n. sp. 
Cespitose alpine perennial, caudex-branches clothed with dead 
leaves below; leaves linear, 5-7 mm. long, i mm. or less wide, 
acute, midvein prominent, glabrous except for the strong marginal 
cilia: scapes slender, glabrous or sparingly pubescent, 1-4 cm. 
long: sepals greenish, usually glabrous; petals yellow, nearly twice 
as long' as the sepals : fruiting inflorescence elongated : pods 6-15, broadly 
lanceolate. 3-6 mm. long, 2-3 mm. broad, simply pubescent, flattened: 
style I mm. more or less long: seeds 1-4 in each cell, wingless. 
Of all the newly characterized species, D. Nelsonii seems to be the 
most distinct and most widely distributed. Its afifinities are undoubt- 
edly with the oligosperma group. In manner of growth, elongated 
raceme and rather small pods it is quite similar to D. oligosperma 
and might even be mistaken for that species except for the total 
absence of stellate pubescence in D. Nelsonii, It is a great pleasure 
for the authors to dedicate this plant to their friend and teacher. Dr. 
Aven Nelson, through whose efforts and assistance the expedition 
was made possible that led to the discovery of this fine species. 
Specimens Examined. — California: Castle Peak, Nevada Co., 
•Aug. 3, 1903, Heller; Modoc Co., 1898, Mrs. Bruce; rocky, exposed 
ridges, Mt. Stanford, Nevada Co., July 17, 1892, Sonne, no. 14. 
Idaho: exposed alpine summit, Antelope Mts., near Martin, Blaine 
Co., July 6, 1 91 6, Macbride &f Payson, no. 3077 (type in Gray Her- 
barium, duplicate in Ry. Mt. Herbarium); Soldier Mts., near Corral, 
Blaine Co., June 26, 1916, Macbride &f Payson, no. 2894; exposed 
summit near Parker Mt., Custer Co., July 17, 1916, Macbride &' 
Payson, no. 3253. Oregon: Blue Mts., July, 1886, Cusick, no. 1345. 
Washington: Yakima Region, 1882, Brandegee, no. 373 (in part). 
8. D. oligosperma Hook. Fl. Bor. Amer. i: 51. 1833. 
D. andina (Nutt.) A. Nels. Bull. Torrey Club 26: 352. 1899. 
