20 



53. DRAB A. 



54. DRABA. 



A. R. perenuial, tufted. L. rigid, aiidciliate 

 with rigid bristles. Fl. yellow. Sp. 1-5. 



S. R. perennial, tufted. L. not rigid. 

 i. M. yellow. Sp. 6. 

 ii. M. white. Sp. 7-16. 



C. R. simple. Stem leafy. Sp. 17-20. 



D. R. simple, annual. Scape naked. Sp. 21. 



A. R. perennial, tufted. L. rigid, ciliated 



ivith rigid iristles. Fl. yellow. 



1. cuspidata. L. linear, obtuse. Scape 

 villous. Sta. equalling Pet. Style neai'ly as 

 long as silicle. p. 6. TambuiTa. Monte 

 Cornu. 



2. aizoides. L. Kneai', acute. Scape 

 hauiess. Sta. equalling Pet. Style equal to 

 breadth of silicle. p. 3-5. Open calcareous 

 rocks. 



B. Zahlbruckneri. L. Bneai-, some- 

 what acute. Rac. -stalk hairless. Sta. equalling 

 Pet. Style shorter than breadth of silicle. 

 p. 6, 7. Verg high granitic. Alps. 



4. Sauteri. L. lanceolate. Scape smooth. 

 Sta. half as long as Pet. Silicle subrotundo- 

 ovate, about as long as stalk. Style shorter 

 than width of silicle. p. 6, 7. High. On the 

 Watzmann and Tannengebii'ge, near Salzburg, 

 it. Tyr. 



5. olympica. L. linear, keeled, ciliate, 

 crowded. Scape leafless, velvety. Silicle 

 ovate, villous. Style very short. Fl. large, 

 yellow. Umbel about 4-flowered. p. Mte. 

 Rotondo in Corsica. — Bert. 



B. B. ferennial, tufted. L. not rigid or 



keeled. 



i. Fl. yellow. 



6. alpiua. L. flat, without a keel, lanceo- 

 late. Hairs branched. Silicle oblong. Style 

 very short. Monte More and Turlo in 

 Novarese, 



ii. Fl. white. 



7. tomentosa. Scape 1-2-leaved, downy. 

 L. ovali-oblong, with shoi't, stellate down. 

 Silicle ovate, ciliate ; stalk downy. Style very 

 short. p. 7, 8. Fissures of dry rocks. 

 High. Alps. 



8. frigida. Scape with about one sub- 

 aniplexicaul L. Lower L. ovate, obtuse, densely 

 stellato-pubesccnt. Silicle elliptic, longer than 

 the downy sialic. Stigma nearly sessile, p. 

 7, 8. Rocks, w. Alps of Sw. Tyr. Pdm. 



9. rupestris. Scape dovniy, naked, or 

 with one L. L. lanceolate, haiiy, somewhat 

 dentate. SHicle lanceolate ; this and stalk pubes- 

 cent, p. 5, 6. Ben Lawers. [D. hirta of 



Smith.'} 



10. Johannis. Scape about 2-leaved. L. 

 lanceolate, steUato-pubescent, ciliate at base 

 with simple hairs. Silicle lanceolate ; stalk 

 smooth. Style exceedingly short, p. 7, 8. 

 Very high granitic. Alps. Sw. Tyr. Salz. 



11. nivalis. Scape hairless, naked, or - 

 with one or two L. L. oblongo-linear, ciliate 

 at base with simple haii's. Silicle eUiptic- 

 oblong ; this and stallc quite smooth, p. 7, 8. 

 Pasterze in Carinthia. s. Alps. 



12. 'Wahlenbergii. Scape 1-3-leaved. 

 L. lanceolate, attenuate, hairless, or only 

 cUiate with simple or forked hairs. Silicle 

 oblongo-lanceolate, or lanceolate ; stalk smooth. 

 Style exceedingly short, p. 7. Snowy, siony. 

 Alps. 



a. helvetica, DC. L. ciliate with simple 

 hairs, and sometimes a few simple hairs 

 on the surface. 



/3. lapponica, DC. L. cUiate; haii's simple 

 or forked; a few stellate hau's on the 

 inner L. 



7. Icpvigata, Hoppe. Altogether hairless. 



13. Traunsteineri. Scape about 2-leaved. 

 L. lanceolate, steUato-pubescent, ciliate at 

 base with simple hairs. Silicle lanceolate ; 

 stalk smooth. Style twice as long as broad. 

 p. 7, 8. High rocks. Kitzbuhel in Tyi'ol. 



14. stellata. Scape one-leaved, downy. 

 L. ovali-oblong, with fine starred down. 

 SOicleoval; stalk smooth. Style equalling width 

 of silicle. p. 6, 7- Fissures of rocks. High. 

 Pyr. Sty. Austr. it. Alps. 



15. Isevipes. " Scape naked, or with 

 one L. pubescent. L. ovate, tomentose, with 

 close starry down. Silicle linear, quite smooth ; 

 stalk smooth, p. Rocks. Port d'Oo and 

 Mte. Maladetto, Pyr."— DC. 



16. ciliata. L. on scape two or three. L. 

 ovate, with short acumen, and a denticulate 

 and ciUate cartilaginous margin ! those of the 

 scape oblong. SUicles linear ; these and stalks 

 quite smooth, p. 5, 6. Rocks and stones, on 

 Mount Nanas in Camiola, &c. Very rare. 



C. R. simple. Stem leafy. 



17- incana. Stem bi'anched, velvety. 

 Down starry. L. ovate, dentate. Silicle oblong, 

 smooth, somewhat twisted, longer than the 

 haiiy staUv. b. 5, 6. Cole. mns. 



