190 TETR ADYNAMIA SILIQUOSA. Sisy'mbrium. 



B. 1840. Sb. 207. Raphanus aquaticus. G. E. 

 240. 



Rivers, ditches. 

 Per. Jul^/. 



Roots long, perpendicular. Ste7n crooked at the joints. Ls. root- 

 ones stalked. F"/. yellow, St^le lengthened out. Pods short, 

 small, pointing upwards. Fruit-stalks longer than the pods, at 

 length bending downwards. 



Grows to a gi-eat size, with long, floating stems, and comb-like 

 Is. under water : in dryer sitiiations of a smaller form, and broader 

 Is. Ends of the general fl. -stalk often sw^oUen into a purplish sub- 

 stance, cauliflower-like. Ls. variable in form ; those under water 

 deeply wing-cleft, otherwise deeply saw-toothed. 



SISYMBRIUM. Hedge-mustard. 



S. qfficindle. Common H. Pods pressed close to the 

 main stalk, awl-sliaped, downy. Upper leaves mostly 

 runcinate, hairy. Stem rough with bristles bent back. 

 Erysimum officinale. E. B. 735. C. 5. 50. Sb. 

 201, E. Dioscoridis LobeUi. G. E. 254. 



Waste grotind, hy road sides and on banks. 



An. July. 



Stem two f. Easily known by its long, spreading branches, set 

 with numerous, close-pressed seed pods, and terminating in a 

 small, dense cluster of lemon-coloured fl. Branches widely 

 spreading, ascending. Ls. lower ones somewhat winged, 

 upper ones halbert-shaped ? terminal lobe nearly at the end, in 

 both large, in former /s. rounded, in the upper oblong. Raceme 

 very long. Fruit-stalks very short. 

 Infusion of the herb, or seeds, formerly recommended in asthma, 



and hoarseness : superseded by better remedies. 



S. 'Irio. Broad H. M. London Rocket. Leaves 

 runcinate, toothed, smooth as well as the stem. Pods 

 erect. E. B. 1631. C. 5. 48. 



Waste ground, banks, heaps of rubbish,** {chiefly about London.) 

 Under Merton Wall. Rose Lane. Sb. and Bx. (1818.) 

 Naturalized in the Botanic Garden. Bx. Covered rubbish in 

 the spring, after the gi'eat fire of London. Sm. E. F. 

 Morison, in his Preeludia Botan, : seems to argue for its produc- 

 tion by spontaneous generation, from the fixed and volatile 

 salts, sulphur, &c. 



An. July. 



Stem about two f, branched, round. Ls. alternate, wing-cleft, 

 lobes recurved ; lower Is., generally terminated by a long, 

 halbert-shaped lobe ; upper ones usually simple, spear-shaped, 

 wHth one or two teeth towards the base. Fl. small, yellow. 



