112 CRUCiFER^. Draba. 



numerous, rather sliurt : flowers rather large : pods oval to narrowly oblong, pubescent, 

 twisted, 2 to 4 lines lung, not iuchuling the very slender style {\i lines long) ; stigma lobed. 

 — Jour. Bot. iii. 186 (1814) ; Torr. & Gray, Fl. i. 106. Alijssum (?) dentatiun, Nutt. Gen. ii. 

 63. D. denlata, Hook. & Arn. Jour. Bot. i. 192; Hook. Ic. t. 31. — Mountains of Virginia 

 and Tennessee ; cliffs of the Kentucky River, Short. 



§ 5. Aizopsis, DC. Leaves linear, entire, becoming rigid with reflexed margin 



and carinate by the prominent miduerve : scapose, alpine, and densely cespitose. 



— Syst. ii. 332. 



D. glacialis, Adams. Caudex much branched ; branches short and slender : leaves 2 to 9 

 lines long, more or less loosely stellate-pubescent, sometimes ciliate at base : scape slender, 

 |- to 6 inches high, pubescent or glabrate, raceme rather few-flowered ; sepals somewhat 

 villous or glabrous : petals yellowish : pods ovate to ovate-oblong, acute, rounded at base 

 (or narrowly oblong and acute at both ends), usually finely pubescent, 1 to 4 lines long on 

 pedicels 1 to 6 lines in length, 8 to 16-ovuled ; style a quarter to half line long. — Me'm. Soc. 

 Nat. Mosc. V. 106 ; Kegel, Bull. Soc. Nat. Mosc. xxxiv. pt. 2, 186, t. 5, f. 3, 4 (var.) ; Hook. f. 

 Fl. Brit. Ind. i. 142. D. oligospenna, Hook. Fl. Bor.-Am. 1.51. D. alpina, ydiv. glacialis, 

 Dickie, Jour. Linn. Soc. xi. 33. — Frequent in the Rocky Mountains from Brit. America to 

 Wyoming and Montana, more rare south and westward ; South Park, Colorado, liothrock 

 & IFo//'; Uinta Mountains, Utah, Watson ; Blue Mountains, Oregon, Cusick ; Mt. Dana, 

 Calif., Brewer ; Cascade Mountains of Washington, Lijall, Tweedy ; McLeod's Lake and 

 Stewart Lake Mountains, Brit. Columbia, Macoun ; also collected in the arctic regions by 

 Richardson in lat. 68°, on the Mackenzie River, and by Franklin. Very varialde but well 

 marked and apparently identical with Asiatic forms, as described, originally found on the 

 arctic coast of Siberia and the banks of the Lena. The smaller higher alpine specimens 

 have sometimes the pubescence very fine and dense. (Asia, Spitzbergen.) 



Var.* pectinata, Watson .^ Alpine and very densely cespitose, the short rigid 

 leaves glabrous or nearly so, and ciliate with long rigid hairs : pods 4-6-seeded, pubescent 

 with branched hairs, or glabrate; valves only moderately convex. — Proc. Am. Acad, xxiii. 

 260. D. densifolia, Nutt. in Torr. & Gray, Fl. i. 104. — California, Silver Mountain, Brewer, 

 and Mt. Lola, Zemmow ; Nevada, E. Humboldt Mountains, Watson; lAaho, Nevius ; Utah, 

 Jones ; Uinta Mountains, Watson, no. 88, a form with fleshy shorter glabrous and less 

 ciliate leaves. 



D.* Douglasii, Gray.'^ Leaves firm or even somewhat cartilaginous, at first pubescent 

 with short nearly simple hairs but glabrate except the strongly ciliated margins, not lucid : 

 scapose stems half inch to inch and a half high, finely pubescent with simple hairs : flowers 

 white: pods ovate, acuminate, 2 lines long: valves becoming very strongly convex, pubes- 

 cent with simple hairs ; style slender, half line to a line in length ; ovules only two (or 

 rarely four) in each cell, pendent from near the apex of the cells; seeds very large. — Proc. 

 Am. Acad. vii. 328 ; Brew. & Wats. Bot. Calif, i. 29. Braya Oregonensis, Gray, 1. c. xvii. 

 199. Cusickia, Gray, 1. c. — High mountains of the Sierra Nevada, from San Bernardino 

 Co , Parish, northward throughout California to Union Co., Oregon, Cusick, and Klikitat, 

 Washington, Howell; also in N. & W. Nevada, Anderson, Watson; first coll. by Douglas; 

 fl. April to June. 



2. ATH YSANUS, Greene, (d privative, and Ov(ravo<s, fringe, in reference 

 to the lack of the distinct border which in Thysanocarpus is present and often 

 cleft.) — A monotypic annual, formerly classed with Thysanocarpus, but, as Prof. 

 Greene has pointed out, nearly related to Draba unilateraUs, Jones, and generically 



1 Description amplified to exclude more clearly tlie following nearly related species. 



2 Dr. Watson omitted this species from his preliminary treatment of the genus, having probably 

 noticed its identity with Dr. Gray's Braya Oregonensis. There can be little doubt, however, that 

 Dr. Gray's earlier disposition of the plant in the genus Draba was the more accurate. The micro- 

 scopic structure of the false septum in the fruit is of Draha, and very different from that of Braya, a 

 genus to which on other accounts this species can scarcely be referred. D. Crockeri, Lenimon, Bull. 

 Torr. Club, xvi. 221, is from character and habitat a synonym. 



