lyraba.] CRUCIFER^. 



53 



Hab. Arctic and subarctic America, as well as upon the Rocky Mountains; frequent. S. Unalaschka. 

 Chamisso. s. Sea shores between the Coppermine and Mackenzie Rivers. Dr. Richardson. — A most 

 variable plant, differing, as do the rest of the genus, in the length and breadth of the foliage, in the degree of 

 pubescence, in the form of the siliculse, and in the absence or presence of leaves upon its stem j so that to me 

 it appears, on the one hand, readily to pass into D. rupestris of Mr. Brown, which here (out of respect to 

 such high authority,) I have ventured to keep distinct; while, on the other, it is difl&cult to distinguish it from 

 some of the slender states of D. incana. 



11. D, rttpestris ; scapo nudo vel unifoliato pubescente, foliis oblongo-spatbulatis sub- 

 hirsutis ciliatisque, siliculis oblongis pubescentibus vel glabris, stylo perbrevl, stio-mate 

 emarginato. 



{£. siliculis pubescentibus. Br, in Hort, Kew, ed, 2. v, 3. p, 91. Hook. IT, Scot, L 

 p. 197. Cham, et Schlecht. in Linnaa, v. 1. p. 23. De Cand. Prodr. v. \. p, 169. — D. hirta. 

 Sm. in Engl. Bat. t 1338. (not o^ Linn, nor o^ FL Dan. — Br.) Sm. in Engl. Fl. v, 3. p. 159. 

 — D. hirta, /i. alpicola, Wakl. Lapp, p, 175. t. II. f. 1. Hook. Fl. Scot. 1. p, 197. — D. 

 hirta, var, 4. Hook, in Parry*s 2d. Voy. App. p. 386. 



^. siliculis glabris. 



Hab. (3. Rocky Mountains, in stony places, between lat. 52° and 57°. Drummond. — This species was 

 founded by Mr. Brown, on specimens, I believe, from Ben Lawers, in Scotland; where I have gathered 

 for many successive years in great abundance, and it assuredly varies in the pubescence being more or less 

 dense, and more or less branched and stellated. The siliculae are generally pubescent; but sometimes, as is 

 the pedicel, quite glabrous. The latter is the state of the Rooky Mountain plant, and it is probably identical 

 with A. nivalis of Willdenow. 



12. D.lapponica; scapis nudis glaberrimis, foliis lanceolatis integerrimis pilosiusculis, 



siliculis ovato-lanceolatis pedicellisque glaberrimis. DC. — Willd. — De Cand, Prodr. v. 1. 



p. 169, Br. in Parry's 1st Voy. App. p. 2QQ. Cham, et Schlecht. in Linncea, v. 1. p. 22. — D. 



hirta, var. 3. Hook, in Parry's 2d Voy. App. p. 386. — D. androsacea. Wahl. Lapp. p. 



174. t 11./ 5. 



Hab. Shores and Islands of Arctic America. Jloss. Parry. 



13. D. stellata ; scapis l-phyllis pubescentibus, foliis ovali-oblongis pube stellata brevi 

 tomentosis, pedicellis puberulis, siliquis oblongis. DC. — Jacq. Hort. Vindob. p. 113. Obs. 

 n. 54. t. 4. f. 3. De Cand. Prodr. v, 1. p. 169. Cham, et Schlecht. in Linncea^ v. I. p, 22. 

 D, hirta. Jacq. Austr. t. 432. 



)3, hebecarpa ; siliculis undique velutino-pubescentibus- DC, 



Hab. Unalaschka. Chamisso. /S. Arctic America. Dr. Richardson. — The figure referred to in Jacquin*s 

 Flora Austriacay I have always conceived to be admirably characteristic of our Scottish D. rupestris, espe- 

 cially the upper figure. The var. j3. is very hairy, and more disposed to be leafy on the stem than the 

 D. rupestris of this country. 



14. D. IcBvipes ; scapis nudis monophyllisve pubescentibus, foliis ovatis pube stellata 

 brevi tomentosis, siliculis elongato-linearibus pedicellisque glaberrimis. De Cand. Syst, 

 Nat. V. 2. p. 346. De Less. Ic. Sel. v, 2. t. 46. / a. De Cand. Prodr. v, I. p. 169. 



Hab. Rocky Mountains, between lat 52° and 57°. Drummond.— A few specimens, well according with 

 De Candolle's description and De Lessert's figure, are in Mr. Drummond's collection. 



