Isatis.] CRUCIFERjE. 27 



Br. FL 1. p. 292. E Fl. v. ui.p. 166. — Thlaspi campestre, Linn. 

 —E. Bot. 1. 1385. 



This species, though common in England and Scotland, is rare in 

 Ireland. It has been observed by Mr. J. Drummond in the County of 

 Cork. Fl. July. ©. — Ten or twelve inches high. Stems solitary, 

 branched above. Lower leaves almost spathulate, all slighty pu- 

 bescent, as well as the racemes and pedicels. Pouch curiously 

 scaly. 



4. L. Smithiiy Hook. Smooth Field Pepper-wort. Pouch ovate, 

 emarginate, winged, glabrous, quite smooth, or occasionally 

 very minutely scaly on the back ; style much exserted beyond 

 the notch ; cauline leaves sagittate, toothed. Br. Fl. 1. p. 297. 

 E. Fl. v. iii. p. 167.— Thlaspi hirtum, Fl. Br. p. 684. (not of 

 Linn.) E. Bot. t. 1803. 



Borders of fields and hedges. Plentiful on the Hill of Howth, 

 ditch banks above Dundrum, and many other places near Dublin. 

 Near Warrenpoint ; Mr. Templeton. Fl. June, July. $ . — Six to 

 eight inches high. Stems many, from the same perennial, or, perhaps, 

 biennial, root. Much resembling the last, but truly distinct from it, 

 with a whiter and more abundant pubescence. Stems and racemes 

 hairy. Pod with a much larger style, quite glabrous, and smooth or 

 even ; except that rarely, in the middle of the back, there are a few 

 very minute scales. 



Tribe VIII. Isatideas. De Cand. 



Silicula with indistinct or indehiscent keeled valves, one-celled, 

 one-seeded, with an imperfect septum. Seed ovate, oblong. Coty- 

 ledons flat, incumbent, parallel with what should be the septum. 



18. Isatis. Linn. Woad. 



Pouch 1-celled, 1-seeded, laterally compressed. Valves keeled 

 eventually separating. Cotyledons incumbent (O II )• — Named 

 from laa'gu), to make even, because it was supposed to have the 

 property of reducing the inequalities of the skin. 



Teti -adynamia. Siliculosa. 



1. I. tinctoria, Linn. Dyer's Woad. Pouch obovato-oblong, 

 glabrous ; radical leaves oblong, crenate ; those of the stem sa- 

 gittate. Br. Fl. \.p. 294. E. Fl. v. iii. p. 182. E. Bot. t. 97. 



Cultivated fields, scarcely indigenous. Fields near Woodlands, 

 County of Dublin. Fl. July. $ . — Cultivated for the sake of the 

 blue dye which it yields, and used by the ancient Britons to paint their 

 bodies. 



Suborder Orthoploce;e." De Cand. O > > 



Cotyledons incumbent, folded lengthwise, so as to receive the radicle 

 in the folds. Seeds generally round, never bordered. 



