]^]^2 CRUCIFERiE. I^ruba. 



numerous rather short : flowers rather large : pods ovA to narrowly oblong, pubescent, 

 twisted 2 to 4 lines Ion-, not iududing the very slender style (U lines long) ; stigma lobcd. 

 — Jour Bot. iii. 186 (ISU) ; Torr. & Gray, Fl. i. 106. Alyssum (?) dentatnm, Nutt. Gen. n. 

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

 and Tennessee ; cliffs of the Kentucky Kiver, Short. 



§ 5. Aizoi'Sis, DC. Leaves liuear, entire, becoming rigid with reflexed margin 

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

 — Syst. ii. 332. 



D glacialis, Auams. Caude.\ much branched; branches short and slender: leaves 2 to 9 

 "lines luut;, n'lore or less loosely stellate-pubescent, sometimes ciliate at base: scape slender, 

 -I to 6 iirJlies 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. — Mem. 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. JJ. olkfospcniia, Hook. Fl. Bor.-Am. 1.51.' D. nlpim, var. 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 Bark, Colorado, Rothrock 

 & *iro//;*Uinta Mountains, Utah, Watson; Blue Mountains, Oregon, Cusick; Mt. Dana, 

 Calif., i^reim- ,- Cascade Moimtains of Washington, Z-ya//, Tweed,/; McLeod's Lake and 

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

 Richardson in lat. 68°, on the Mackenzie Kiver, and by Franklin. Very variable 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, Spitzbcrgen.) 



Var * pectinata, Watson. i 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 brtmched hairs, or glabrate; yalves only moderately convex. —Proc. Am. Acad, xxiii. 

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

 and Mt Lola Lemmon ; Nevada, E. Humboldt Mountains, Watson; Idaho, Nevius ; Utah, 

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

 ciliate leaves. 

 D * Douglasii, Gkay."-^ Leaves firm or even somewhat cartilaginous, at first pubescent 

 'with short nearly simple hairs but glabrate except the strongly ciliated margins, n.>t lucid: 

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

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

 cent with simple hairs ; stvle 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. Brat/a Oregonensis, Gray, 1. c. xvii. 

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

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

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

 fl. April to June. 



2. ATH"^SANUS, Greene, (d privative, and Ova-avo^, fringe, i" reference 

 to the hick 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 unilateralis, Jones, and generically 



1 De.<!cription amplified to exclude more clearly the following nearly related species. 



2 Dr Watson omitted this species from bis pvehminary treatment of the genus, having probably 

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

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

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

 pcnus to which on other accounts this species can scarcely be referred. D. Crockeri, Lemmon, BulL 

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



