TETRADYNAMIA— SILICULOSA. Isatls. 181 



awl-shapeil, distinct, simple. Anih. roundish. Germ. 

 almost orbicular, notched at the summit, compressed. 

 Style very short. Stigma obtuse. Pouch ovate, trans- 

 versely compressed, bordered, of 2 cells, cloven at the 

 top into 2 acute lobes, between which stands the per- 

 manent, somewhat elongated, style; valves 2, distinct, 

 boat-shaped, each with a dilated pointed keel ; partition 

 elliptical, membranous, as wide as the valves. .SVrr/.v 

 solitary in each cell, pendulous, ovate; cotyledor.s cMia. 

 flat, accunibent. 

 Herbaceous, or in some degree shrubby. Leaves, rather 

 fleshy, undivided or pinnatifid, entire or toothed. Fl. 

 white, or purplish, never yellow; the outer ones in each 

 corymbose head or cluster most irregular, somewhat ra- 

 diant. Pouches erect, or inflexed, racemose. DeCandolle 

 has 25 species. 



1. \. ajuara. Bitter Candy-tuft. 



Stem herbaceous. Leaves lanceolate, acute, pardy notched. 



Flowers in oblong clusters. 

 I. amara. Linn. Sp. PL 906. mild. v. 3. 456. FL Br. 692. Engl. 



Bot. V. 1 . /. 52. DeCand. Syst. v. 2. 398. 

 1. n. 520. Hall. Hist. v. 1. 223. 

 Thlaspi aniarum. Ger. Em. 263./; bad. 

 T. umbellatiun arvense amariim. Buuh. Hist. v. 2. 925./. 

 T. unibellatuni arvense, iberidis folio. Moris, v. 2. 295. sect. 3. 1. 1 7. 



f. 18; co])ied from Gerarde. 

 Thlaspidium foliis nasturtii. Riv. Tetrap. Irr. /. 1 12, 



In chalky fields^ but rare. 



About Henley and other places in Oxfordshire. Huds. About 

 Wallingfor'd, Berkshire, pkntifuUy, and undoubtedly wild. 



Annual. July. 



Whole plant smooth, of a nauseous bitter flavour. Root small, 

 tapering. Slejns diffuse, branched, leafy. Leaves lanceolate 

 and entire, or dilated and wedge-shaped, with several tooth-like 

 notches. Corymbs soon lengthened out into clusters of hand- 

 some brilliant-white Jiowers, which have procured it a place, 

 among hardy annuals, in some gardens. 



328. ISATIS. Woad. 



Linn. Gen. 344. Juss. 242. Fl. Br. 693. DeCand. Syst. v. 2. 564. 

 Tourn.t. 100. Lam. t. 554. Gcertn.t. \42. 



Cal. equal at the base, coloured ; leaves ovate, concave, 

 spreading, deciduous. Pet. obovate, entire, equal, taper- 

 ing at the base into short claws. Pilam. thread-shaped, 

 spreading, simple, as long as the calyx. Anlh. roundish. 



