TETRADYN, SIL1CUL. 197 



pouch is clothed with minute, forked, divaricated white hairs. It can- 

 not therefore be the same as the following*. 



3. Dr. hirta (hairy alpine H 7 /iit low-grass), scape generally with 

 one or two ovate dentate or entire leaves, petals undivided, 

 pouch oblong and as well as the pedicels glabrous, leaves lan- 

 ceolate plane hairy and stellato pubescent. 



/3. alpicola, scape straight, pedicels shorter, leaves with stellated 

 hairs. IVahl. Lapp. p. 175. t. \\.f. 1. Dr. slellata, Jacq. 

 Austr. t. 432. 



HAB. (3. Rocks at the summit of Cuirn-gorum, Hook. Fl. July. 1J. . 



1 have specimens from Wahlenberg himself of this species which per- 

 fectly accord with my plants gathered on Cairn -gorum and the 

 figure and description leave me no reason to doubt that the Draba 

 stellata in Fl.Austr. is also the same as mine. The a., Wahlenberg 

 tells us, is the true hirta of Linn., and has very few stellated hairs 

 on the leaves, ft., besides being of a more rigid habit and more hum- 

 ble growth (from 2 4 inches high) , has the foliage rather thickly 

 covered with starry pubescence, besides having simple hairs, espe- 

 cially at the margin. The scape is stellato -pubescent too ; but the 

 pedicels as well as the pouches are gla"brous ; in which particular, 

 as well as in the less downy leaves and the constant presence on 

 them of simple hairs, it differs principally from the Draba muricella 

 of Wahlenberg, the D. hirta of Fl. Dan. May not these and even 

 the D. rupestris above described, be mere varieties of one species ? 



4. Dr. incana (twisted podded Whit low -grass), cauline leaves 

 numerous lanceolate dentate hoary with starry pubescence, 

 pouch oblong somewhat twisted. Lightf. p.338. E. B.t.SSS 

 (bad fig. from a cultivated specimen) . 



HAB. Near the rocky summits of the Highland mountains, not unfre- 

 quent. In Isla, Skye, Assynt, c., Lightf. Ben Lawers, Maugh. 

 Craig-na-cailleach, Dr. Walker. Heaths on the E. coast of Suther- 

 land, near Wilk-house Inn, Mr. Borrer and Hook. Fl. June, July. 

 <? 



Four to six or eight inches high, sometimes throwing out lateral 

 branches, stout, very leafy. Lower leaves mostly entire ; upper ones 

 deeply toothed, almost cut, acute. Pouches erect, glabrous in my 

 Scotch and Iceland specimens, pubescent in some from Switzerland, 

 as they are also described to be constantly in Lapland. Small starved 

 vars. of this plant come very near the Z). hirta. 



5. Dr. muralis (Speedwell-leaved W hit low- grass}, stem branch- 

 ed, leaves ovate obtuse amplexicaul dentate, pouch patent 

 glabrous, Br. B. B.t.9\2. 



* I have, since the above description was written, seen Mr. Don's speci- 

 mens of the Ben Lawers plant. It has stellated hairs mixed with the simple, 

 and the pouches are in some instances scarcely perceptibly pubescent j so 

 that I have, more than ever, reason to believe the D. rupcs'tris of Br. is but 

 a slight far. of the D. hirta. 



