160 TETRADYNAMIA— SILICULOSA. Diaba. 



lanceolate, compressed but not flat, tipped with the very short 

 thick style and capitate stigma ; their valves usually rough with 

 minute, forked, spreading, rigid, white hairs ; but they are some- 

 times quite smooth and naked, as in one of the Linnsean, and 

 some of our Scottish specimens. 

 After a careful re-examination, I cannot but confirm the descrip- 

 tions and synonyms of FL Br. and Engl. Bot. The figure in the 

 latter work is correct, if not luxuriant. No wonder Dr. Wahlen- 

 berg could not find in it the characters of his D. hirta, that be- 

 ing, as I presume, a different species, characterized by one, two, 

 or three ovate, strongly toothed or serrated leaves on its stalk, 

 or stem. I have such from Lapland, gathered by Dr. Swartz. 

 The pouches and stalks are, as in the real D. hirta, either mi- 

 nutely hairy or smooth. I must leave Dr. Hooker's hirta for 

 future examination, as he refers to Jacquin's hirta, FL Austr. 

 t. 432, a totally different species, which is Haller's n. 497, well 

 known in Switzerland, but not in Britain. Bauhin's Bursa pas- 

 toris alpina hirsuia, Prodr. 51./, agrees in the stem-leaves with 

 Swartz's and Wahlenberg's plant, but the description of its soft 

 and hoary radical foliage answers better to Jacquin's. 



4. D. incana. Twisted-podded Whitlow-grass. 

 Stem-leaves numerous, hoary, like the stem, with close starry 



pubescence. Pouch elliptic-oblong, oblique or twisted, 



longer than the hairj' partial stalks. 

 D. incana. Linn. Sp. PL 897. FL Suec. ed. 2. 224. 



mild. V. 3. 430. FL Br. 430. EngL Bot. v. 6. t. 388. Hook. 



Scot 197. Don H. Brit.fasc. 8. 187. Wahlenh. Lapp. I7fi. FL 



Dan. L 130. Ehrh.Phyt.7b. 

 D. contorta. Ehrh. Beitr. v. 7. 155. DeCand. Srjst. v. 2. 348. 

 Lunaria contorta major. Raii Syn. 29 1 . 

 Leucojum, sive Lunaria, vasculo sublorgo intorto. Pluk. Almag. 



215. PhyLL 42./. I. 

 Wreathed Cress. Petiv. H. BriU t. 48./. 3. 

 /3. Paronychise similis sed major, perennis alpina repens. Raii Syn. 



ed.2. 165. erf. 3. 292. 

 Small Wreath Cress. Petiv. H. BriL L 48./ 4. 



On alpine limestone rocks. 



On the summits of the mountains of Wales, Westmoreland, and 

 Scotland. Upon the top of Ingleborough, Yorkshire. Mr. Wood- 

 ward. Upon Ben Lawers, Loch-na-gair, and Cairn-gorm. Mr. 

 G. Don. On heaths, on the east coast of Sutherland, near 

 Wilk-house inn. Dr. Hooker and Mr. Borrer. 



Biennial. May, June. 



Root long, tapering, with numerous capillary radicles. Herb all 

 over hoary, with minute, starry, crowded and close-pressed hairs, 

 very variable in stature and luxuriance, like most biennial or an- 

 nual plants, according to the moisture or nourishment it re- 

 ceives. Stern from 2 to 12 inches high in a wild state, 2 feet 



