CATALOGUE OF SPECIES. 63 



Draba caroliniana micrantha (Nntt.) in Torr. & Gr. PI. i. 109 (1838), as D. 

 micrantha; Gray, Man. ed. 5. 72 (1867). Typo locality, "open plains and rocky 

 places about St. Louis, and in Arkansas." 



The specimens of this plant collected in the Panamint Mountains (No. 638) arc 5 

 cm. or less high, and resemble in all details specimens from Idaho and Washington. 



Draba glacialis Adams, Mem. Soc. Mosc. v. 106 (1821). 

 Cottonwood Creek, White Mountains (No. 1809). 



Draba lemmoni Wats. Bot. Cal. ii. 430 (1880). Type locality, "summit of Mount 

 Lyall, at 13,000 feet altitude." 



Collected in the Sierra Nevada (Nos. 1541, 2069). Determined by Sereno Watson. 

 Dr. Watson refers our flowering specimens of No. 1541 doubtfully to this species, 

 with the note, "it conies nearest apparently to real D.alpina, which has never been 

 found in the United States. It does not show the thick leaves which are character- 

 istic of D. lemmoni, but these may come with age, as also the twisted pods which 

 serve to distinguish that species." 



Draba sonora? Greene, Bull. Cal. Acad. ii. 59 (1886). Type locality, "north- 

 western Sonora." 



Our specimens, like others collected in the Colorado Desert, differ from the original 

 in a few minor details. They are of about the same size but more robust, and have 

 more spreading pedicels and larger capsules, approaching in general appearance D. 

 cuneifolia. But the stellate pubescence of the capsule, pointed out by Dr. Watson 1 

 as principally characteristic of the species, is distinctly marked. 



The species is characteristic of the Lower Sonera n zone, and was found in the 

 Vegas Wash (No. 417), and in Johnson (No. 487) and Willow Creek canons, Pana- 

 mint Mountains. 



Draba stenoloba Ledeb. Fl. Ross. i. 154 (1841). Type locality, " in ins[nlaj Una- 



lasehka." 



Near Mineral King, Sierra Nevada (No. 1568). In ours, as in most Sierran speci- 

 mens, all the leaves are entire. 



Draba subsessilis Wats. Proc. Amer. Acad, xxiii. 255 (1888). Type locality, "o 

 the White Mountains of Mono County, California, at 13,000 feet altitude." 

 Near Mount Whitney (No. 2051). Determined by Sereno Watson. 



Sisymbrium canescens Nutt. Geiuii. 68 (1818). Type locality not given; range 



"from Virginia to Georgia." 



Although the characters and geographical ranges of the various forms of S. 

 eanetoms and 8. incisum are not well determined, in this region there are two easily 

 distinguishable plants, one very cancscent, with finely divided leaves and without 

 glandular hairs; the other larger with broader leaf lobes, viridescent, and usually 

 with some glandular hairs. The former is here referred to as S. canescens. It occurs 

 throughout the desert up to about the lower limit of trees. The other, 8. incimm, 

 is found in the forest regions nearly to timber-line. 



Specimens were collected in Keating Springs Valley (No. 284) and in Johnson Canon, 

 Panamint Mountains (No. 512). 



Sisymbrium diffusum Gray, PL Wright, i. 8 (1852). Type locality, " pass of the 

 Limpia, in crevices of rocks on the mountains." 



Authenticated by Sereno Watson. Main branches 40 to 65 cm. long. Lower 

 leaves 5 to 10 cm. long. Sepals 3 to 3.8 mm. long, the petals about one half longer. 

 Immature capsules 11 mm. long, on pedicels sometimes 7 mm. long. From these 



i Proc, Amer. Acad, xxiii, 256 (1888), 



