TETRADYNAMIA— SILICULOSA. Draba. 161 



when cultivated, simple or somewhat branched, copiously leafy, 

 its starry pubescence accompanied by, or sometimes in the lower 

 part changed for, fine long simple hairs. Radical leaves elliptic- 

 lanceolate, forming in the first season a dense rose-like tuft ; 

 those of the stem, the following year, very numerous, scattered, 

 sessile, ovate, ribbed, variously toothed or cut, seldom, except 

 in starved plants, quite entire. Fl. numerous, white. Cal. hairy. 

 Pet. inversely heart-shaped, twice the length of the calyx, with 

 taper claws. Partial ^o?/;er-sto/A:s very hairy, scarcely half the 

 length of the pouch, which is about half an inch long, elliptic- 

 lanceolate, or oblong, more or less oblique, uneven, or twisted 

 half round, flat not tumid, the edges thick, the summit crowned 

 with the extremely short thick style, and depressed capitate 

 stigma. The surface of the pouch in British specimens 1 find 

 to be always smooth. Ehrhart's specimens of his D. incana, or 

 Holarges, Phytoph. 75, are not in fruit, but one of the germens 

 carefully examined, proved only slightly and partially hairy, and 

 could not possibly have produced a hoary pouch. Yet this sy- 

 nonym is applied by Ehrhart to his own D. confusa, whose pouch 

 should be downy, while DeCandoUe refers it, by my specimens, 

 to his D. contorta, my incana. From all that I have seen, as 

 well as from the analogy of the preceding species, I am satisfied 

 that the smoothness or roughness of the fruit affords but a trivial 

 distinction, and DeCandoUe seems of the same opinion. The 

 figure in Engl. Bot. taken from a wild seedling, made to blossom 

 in a garden, is therefore over luxuriant ; but being very faith- 

 ful in every particular does not deserve to be stigmatized as 

 " bad." 



5. D. muralis. Speedwell-leaved Whitlow-grass. 



Stem branched. Leaves heart-shaped, toothed, hairy. Pouch 

 elliptical, obtuse, flat, shorter than the partial stalks. 



D. muralis. Linn. Sp. PL 897. IVilld. v. 3. 429. Fl.Br.679. Engl. 



Bot. V. \3.t.9] 2. Hook. Scot. 197. Lond. t. 64. Scop. Insubr. 



fasc. 2.t.lD. DeCand. Syst. v. 2. 352. Don. H. Brit.fasc. 8. 188. 

 D. n. 499. Hall. Hist. i\ 1. 215. 



D. minima muralis discoides. Column. Ecphr. v. 1. 274. t. 272. 

 Bursa pastoris major, loculo oblongo. Bauh.Pin. 108. Prodr. 50. f. 



Rail Syn. 292. Morh. v. 2. 305. sect. 3. t. 20. f. 5. 

 Speedwell Cress. Petiv. H. Brit. t.48.f.5. 

 Myagroides subrotundis serratisque foliis, flora albo. Barrel. Ic. 



t.8l6. 



On the shady sides of limestone mountains, or on walls, but rare. 



In several parts of ('raven. Yorkshire. Ray. About Malham Cove. 

 Dr. Richardson and others. At Old Malton, on walls. Rev. Arch- 

 deacon Peirson. On the Wardon Hills, Bedfordshire. Rev. Dr. 

 Abbot. On dry banks at Emborough, Somersetshire. Mr. Sole. 



VOL. in. M 



