TETRADYNAMIA— SILIQUOSA. Sinapis. 221 



Jit. H. Kew. V. 4. 1 25. DeCand. Syst. v. 2. 607. Lam. t. 566. 

 Gcertn. t. 143. 

 Sinapi. Tourn. t. 112. 



Cal. equal, and nearly flat, at the base ; leaves oblong, 

 straight, spreading almost horizontally from the very 

 bottom, deciduous. Pet. obovate, rounded, entire, or 

 slightly notched, spreading ; claws linear, erect. Filam. 

 awl-shaped, simple, erect. Antli. oblong, slightly spread- 

 ing. Glands 4- ; 2 at the inside of the shorter filaments, 

 2 at the outside of the longer. Germ, cyhndrical, taper- 

 ing into a very short style. Stigma capitate, rather small. 

 Pud nearly cylindrical, variously beaked, of 2 concave 

 undulated valves, and 2 longitudinal cells, besides 1 for 

 the most part in the beak, generally barren. Seeds in a 

 single row, nearly globular, with 1 occasionally in the 

 beak ; cotyledons folded, incumbent, their doubled edges 

 meeting the radicle. 



Upright, branching, annual or biennial /lerbs, often hairy or 

 bristly. Leaves lyrate, or deeply cut, or toothed. Ft. 

 3'ellow, in corymbose clusters. Seeds acrid. The beak 

 of the pod, in some, is little else than a permanent unal- 

 tered st7/le. The seeds in those species which constitute 

 DeCandolle's Diplotaxis are partially and very imper- 

 fectly two-ranked, and tXioiv call/ X spreads much less than 

 it ought to do, this being the chief mark of difference 

 between Sinapis and Brassica. 



1. S. cirve7isis. Wild Mustard. Charlock. 

 Pods with many angles, rugged, longer than their own awl- 

 shaped beak. Leaves tootlied; partly lyrate, or hastate. 



S. arvensis. Linn. Sp. PL 933. fVilld. v. 3. .05-4. FL Br. 721. 



Etigl. Bot. V. 25, t. 1748. Curt. Lond.fasc. 5. t. 47. Hook. 



Scot. 204. DeCund. Syst. r. 2. 615. 

 Sinapi n. 467. Hall. Hist. v. 1 . 203. 

 Rapistrum arvorurn. Raii Syn. 295, Ger. Em. 233./. Lob. Ic. 



198./. 

 R. flore luteo. Bauh. Hist. v. 2.844./. 

 Irion, Fuchs. Hist. 257./. ^c. 143./ 

 Lampsana vera. Dalech. Hist. 542./. 



In corn fields, a very troublesome weed 3 abundant in waste ground 

 newly disturbed. 



Annual. May. 



Root small, tapering, rigid, sometimes a little tuberous, but not 

 caulescent. Stem leafy, .striated, often purplish, rough with 

 sharp reflexed bristles. Leaves stalked, rough, variously toothed 5 



