TETRADYNAMIA— SILICULOSA. Draba. 159 



On walls and rocks in South Wales. 



Near Wormshead, 1 6 miles west of Swansea, where it was disco- 

 vered, in 1795, by John Lucas, Esq. Engl. Bot. About Pen- 

 nard castle, near Swansea, abundantly, in inaccessible spots. 

 W. Turton, M.D. 



Perennial. March, April. 



Stems tufted, repeatedly branched in a determinate manner, the 

 leafy branches of the present year bearing each a solitary, ter- 

 minal, naked stalk, with a few bright yellow corymbose_^oM'er5. 

 Leaves very numerous, closely imbricated, linear-lanceolate, 

 rigid, of a shining green, keeled, fringed with white bristly hairs. 



Prof. DeCandolle esteems the plant figured in Curt. Mag. t. 170, 

 to be a distinct species, of a more lax growth, with shorter sta- 

 mens. This is doubtless D. ciliaris of the Linnaean herbarium, 

 and Mantissadl, but I should think its differences owing to cul- 

 tivation. See a figure and description in Gerard Galloprov. 344. 

 t. 13./. 1 . The keel of the leaves is but seldom, if ever, fringed. 



3. D. /ih'/a. Simple-haired Whitlow-grass. 



Stalk nearly leafless. Petals undivided. Pouch elliptic-ob- 

 long. Leaves lanceolate, slightly toothed, fringed with 

 simple hairs. 



D. hirta. Linn. Sp. PL 897. Willd. v. 3. 430. Fl. Br. 677. Engl. 



Bot. V. 19. t. 1338. Don H. Brit.fasc. 8. 185. 

 D. stellata. Dicks. Tr. of Linn. Soc. v. 2. 288. Crypt.fasc. 2. 29. 



fVith.iJCjD. Hull 143 ; but not of Jacquin. 

 D. pyrenaica. Fl, Dan. t. 143j not of Linnoeus. 

 D. rupestris. Br. in Jit. H. Kew. v. 4. 9 1 . DeCand. Syst. v. 2. 344. 



Hook. Scot. 196. 



On rocks in the Highlands of Scotland. 



Upon Ben Lawers. Mr. Dickson. On rocks near the summit. 

 Mr. G. Don. 



Perennial. May, June. 



Root slender, somewhat creeping, subdivided at the crown, bearing 

 several tufts of copious, spreading, lanceolate, bluntish, tlat, 

 decp-grccn leaves; tapering at tiie base^ a little wavy, or sligluly 

 notched, at the margin, fringed with constantly simple bristly 

 hairs, such as are scattered, more or less sparingly, over both 

 surfaces, where a few forked, not stellated, ones are occasionally 

 intermixed. Stalk solitary, sligluly cur\ ed or wavy, 2 or 3 inclies 

 higii, round, simj)ly hairy, either ([uite leafless, or bearing, near 

 the bottom, and sometimes under the lowermost flower, a soli- 

 tary leaf, like tlie radical ones, though smaller, and by no means 

 dilated, ovate, or strongly serrated. /•'/. small, white, densely 

 corymbose. Cal. somewhat hairy. Fcf. obovate, with a shallow 

 notch, erect, twice as long as the calyx. Pouches in a long, un- 

 equal, or interrupted, upriglit cluster, witii hairy partial stalks, 

 about lialf their own length; their form elliptic-oblongratlierthan 



