200 TETRADYN. SILlft. 



Six to ten inches long, slender, with few leaves, and those mostly 

 radical. 



3. A. ciliata {alpine Tower-Mustard) leaves vsubdentate oval 

 glabrous ciliated, radical ones nearly sessile obtuse, cauline 

 ones semiamplexicaul, stem simple. Br. E. B. t. 1746 

 (Turritis alpifia). 



Hab. Rocks near Loch Lea, in Glen Esk, G. Don. Fl. July. ^ . 

 Four to six inches high. . Radical leaves several, oval or obovato- 

 oblong, obtuse. Cauline ones small. Pods nearly erect. 



4. A. kirsuta [hairy Toirer-M/zi^aro?), leaves all hispid dentate, 

 cauline ones semiamplexicaul, pods straight. Br, Lighif. 

 p. 358, and E. B. t. 587 [Turritis kirsuta). 



Hab. Drv rocks, frequent; as upon the rocks in the King's park, 

 Edinb.', Light/. Habbies How and Pentland hills, Maiigh. Bot- 

 tom of Cartlane Crags, Glasg., plentiful, Hopk. Fl. June, c?. 

 (1/, Sm.) 



One foot or more high, very straight, stiff. Stem rough with spread- 

 ing hairs, with many leaves. Flowers small, white. Pods nearly 

 erect. 



5. A. Turrita [Tower JVall-Cress), leaves amplexicaul, pods 

 recurved flat and linear with the margins incrassated, brac- 

 teas foliaceous, E. B. t.\7S. 



Hab. Old walls, very rare. Castle of Cliesh, Mr. Arnott. Fl. May, S . 



One fool or more high. Leaves many upon the stem, oblong, toothed, 

 a little rough, with short pubescence, especially the lowermost, spa- 

 thulate ones large, but gradually smaller upwards, and the upper- 

 most ones become bracteas, each bearing in its axil a single7?ower- 

 stalk. Flowers small, yellowish white. Pods very long, bent 

 backward when ripe, 



13. TURRITIS, 



I. T. glabra [long-podded Tower-Mustard) radical leaves 

 dentate hairy, cauline ones amplexicaul entire glabrous. E. B. 



t.777. 



Hab. Dry pastures, rare. In the wood opposite the inn at Bowling 

 Bay, sparingly, Hopk. Fl. May, June. ©. 



One to two feet high. Leaves oblongo-lanccolate, glaucous; radical 

 ones toothed or sinuated at the base ; cauline ones sagittate. Flow- 

 ers yellowish white. Pods long, erect, ^^^^ole plant very erect, 

 and traight. 



14. BARB AREA. 



1. B. vulgaris [litter Winter -Cress), lower leaves lyrate the 

 terminal lobe rounded the superior ones obovate toothed. 

 Light/, p. 355, and is. B. i. 443 [Erysimum Barharea). 



Hab. Banks of ditches and rivers, but not very common. By the side 

 of the water of Leith, Dr. Parsons. Very frequent in hedges and 

 waste ground, and banks of rivers, about Glasg., Hopk. Fl. May, 

 Aug. 21 . 



