142 x. CRUCIFERJE. (Hook. f. & T. Anderson.)" [Drdba. 



SECT. I. Aizopsis. Rootstock stout, with many crowded tufts of 

 rosulate leaves, which are rigid, ciliate, with a stout midrib beneath. 



1. D. glacialis, Adams in Mem. Soc. Nat. Mosc. v. 106 ; leaves linear, 

 scapes naked, flowers yellow, pods twisted, style distinct. DC. Prodr. i. 

 167 : //. /. & T. Journ. Linn. Soc. v. 160, D. setosa, Royle III 71. D. 

 elegans, oiss. Fl. Orient, i. 300. 



WESTERN TIBET and KDNAWCR, alt. 10-15,000 ft. DISTRIB. Arctic Asia and Ame- 

 rica, Soongaria, Rocky Mts. 



Root slender, woody; branches many, prostrate, tufted, covered below with withered 

 leaves. Leaves densely tutted, rather rigid, entire, rough and ciliated. /Scd/x'* 1-5 iu., 

 numerous, erect, stiff. Flowers crowded near the summit of the scape. Pedicels and 

 calyx glabrous. Pods - in., erect, ovate-lanceolate, acute, glabrous. Scarcely dis- 

 tinct from D. alpina, L. 



SECT. II. Chrysodraba. Pont or rootstock stout, with many crowded 

 tufts of leaves. /,"//>* not rigid, without a strong midrib beneath, setose or 

 tomentose. Flowers yellow. 



2. D. alpina, Linn. ; perennial, leaves densely rosulate oblong spathu- 

 lateor lanceolate, scape leafless or 1-leaved, pols elliptic glabrous straight. 

 H.f.d' T. Journ. Linn. Soc. v. i:.o. J>. radiczms, /////'" III. 71. D. alpic.-ln, 

 Klotnch in Sn /'/'. }\'l,(,m. 128, t. 36, f. 1 (bad). (D. algida, A<i<i,s; 

 Adamsii, Led. ; ochroleuca, Bunge ; polytricha, Ltd.) 



Alpine Himalaya, from SIKKIM t.> KASHMIR and in WKSTKKX TIHET, alt. 12-17,000 ft. 

 DISTRIR. Alps of W. Asia. N. Kiini])*', the h'ocky Mis. and Arctic regions. 



&fem densely tufted, short or 6-10 in. teawi J-l in:, colored with mixed simple 

 and' branched hairs, or glabrous with ciliate margins. Scapes -6 in., i-10-flowered. 

 Flowers rather large, suU agitate. >'//</.< usually glabrous. Pods fa-\ in., shortly 

 racemose, 4-10-seeded ; pedicels nuberect, hairy or glabrous, long; style very short. 



3. D. elata, //./. d6 T. /ourm Linn. Soc. v. 150 ; annu.il, leaves loosely 

 rosulate spathulate obtuse, scapes with distant leaves, pods ovate- or 

 oblong-lanceolate acute twisted. 



Subalpine inner ranges of SIKKIM, alt. 11-13,000 ft., H. f. 



Kivct, 9-15 in., sparingly e-n-.-red with simple and stellate hairs. Radical leaves 

 petiolcd, entire or rarely t<-o:hed. Wmri'.r* numenius, stibcapitate. ^Vya/s ;',' in., hairy, 

 margin scarious. 1\ inls t\vi. e as IMIILT, uvate-oMonj-, clawed. 7'.;f/.< in long lax racemes, 

 once or twice twisted, glabrous when rip- ; pedicels 4 in., spreading or suberect, pilose, 

 lower often bracteate. 



4. D. incompta, Steven in Bull. Soc. Nat. ///W. ^fosc. iii. 268 ; peren- 

 nial, leaves rosulate oblong, scapes naked, pod elliptic-oblong slightly 

 curved not twisted. J)C. Prodr. i. 16^ ; ]),l.-**. /<: ii. 44. D. tibetica, 

 var. y Winterbottonii, II. f. & T. in Jomn. Linn. /S'oc. v. 152. 



WKSTKKN TIBET, alt. 11-13,000 ft., Falconer, Winterbottom.'Dis'riut. Persia, 

 Caucasus. 



A small very tomentose, hoary plant, with short naked branches from the crown of 

 the root, ending in tufts of leaves. Leaves \-^ in., -all tufted, oblong. Scapes |~4 in., 

 pubescent, scarcely lengthening in fruit. Puds glabrous; style short, bent or straight. 

 The fruit of this plant was unknown when it was referred as a variety to D. tibetica; 

 those of Falconer's specimens recently added to the Kew Herbarium have ripe pods, 

 which are similar to those of the Persian and Caucasian plant. 



SECT. III. Leucodraba. Pontslock biennial or perennial, with many 

 tufts of radical leaves. Leaves soft, flat. Flowers white. 



