§24 TETRADYNAMIA—SILIQUOSA. Sinapis. 



About London, Westminster, Windsor, Chester, Bristol,Yarmouth, 

 and other old towns. 



Perennial. June — October. 



Root tapering, rather woody. Herb for the most part entirely- 

 smooth, and more or less glaucous all over, fetid when bruised. 

 Stem bushy, erect, li or 2 feet high, with numerous round leafy 

 branches, occasionally besprinkled with a few hairs. Leaves 

 scattered, a little fleshy, of a glaucous green, very smooth, irre- 

 gularly lobed and cut ; the lower ones stalked, once or twice 

 pinnatifid ; uppermost lanceolate, undivided, and sessile ; the 

 margins of all entire, or sparingly notched. Fl. large and hand- 

 some, but unpleasantly scented, light lemon-coloured. Cal. 

 spreading considerably from the very base, but not horizontally, 

 the tips mostly hairy. Fods an inch or more in length, linear, 

 smooth, compressed, erect, on spreading stalks almost as long j 

 valves undulated, slightly keeled, veiny ; beak none, except the 

 rather short, tapering, angular, furrowed style, not so tumid at 

 the base as even the last, and destitute of any cell, or rudiment 

 of a seed. Seeds in the proper cells of the pod numerous, round, 

 disposed so as to form two, more or less complete, rows in each 

 cell. On this last character Prof DeCandolle principally founds 

 his genus Diplotaxis and its name. The want of a distinct 

 seed-bearing beak to the pod, in some instances, is likewise 

 noted. But the foregoing species, a genuine Sinapis, has scarcely 

 more of a beak than any of them. The learned author candidly 

 allows also that the double row of seeds is by no means constant, 

 or without exception ; and indeed their arrangement is at all 

 times far less decided than in Turritis, where there can be no 

 question about the matter. 



5. S. muralis. Sand Mustard. 



Pods ascending, on spreading stalks, linear, compressed, 

 slightly beaked. Seeds two-ranked. Leaves sinuated. 

 Stem roughish with reflexed bristles. 



S. muralis. Br. in Ait. H. Keio. v. 4. 128. Comp. ed. 4. 1 15. 



Diplotaxis muralis. DeCand. Syst.v.2. 634. 



Sisymbrium murale. Linn. Sp. Fl. 918. Willd. v. 3. 496. Engl. 



Bot.v. 16. t.\090. Fl.Br. 1401. Dicks. Dr. FL \2. 

 S. Erucastrum.. Gouan lUustr. 42. t. 20. 

 Eruca viminea, iberidis folio, luteo flore. Barrel. let. 131. 

 E. minimo flore monspeliensis. Bauh. Hist. v. 2. 862./, notdescr. 

 E. minima monspessulana, flore luteo, siliqua unciam longa. 



Chabr. Sciagr. 276. f. 

 E. monspeliensis, flore minimo luteo. Moris, v. 2. 229. n. 8. sect. 3. 



<.5./.9. 

 In sandy barren ground near the sea. 



