TETR ADYNAMIA SILIQUOSA. Nasturtium. 189 



Stems spreading, for the most part floating, branched, leafy, strik- 

 ing root from the under side. Ls. lower ones large, alternate, 

 somewhat lyre-shaped, terminal leaflet largest. FL white, in a 

 flattish corymb, at length growing into a spike. Pods shortish, 

 slender, curved upwards. Fruit-stalks horizontal. 

 Young Is. warm, pungent, agi-eeable to the taste : in salad : the 

 expressed juice with that of brook-lime, and scurvy-grass, anti-scoi- 

 butic, stomachic : near London regularly cultivated. B. T. 



N. sylvestre. Creeping Yellow G. Leaves winged ; 

 leaflets spear-shaped, deeply saw-toothed, or cut ; those 

 of the uppermost nearly entire. Root creeping. 

 Sisymbrium sylvestre. E. B. 2324. C. 3. 41. Sb. 

 206. Eruca aquatica. G. E. 248. 



Gravelly, wet meadows, margins of rivers, ditches. Banks of the 

 Canal beyond High Bridge. Port Meadow. Binsey Common. 

 Otmoor. Sb. 



Per. June. 



Stems erect, one f., or more, leafy, zigzag, furrowed. Ls. alter- 

 nate, leaflets of the lower ones running down the stem, elliptic- 

 oblong, deeply cut, or toothed ; those of the upper ones nar- 

 rower, deeply saw-toothed, or entire. Common-footstalk chan- 

 nelled. Fl. bright yellow, numerous, in clusters, in a kind of 

 panicle about the stem tops, each cluster soon lengthening out 

 greatly, and becoming zigzag. Pods seldom come to perfection, 

 the plant increasing much by root. 



N. terrestre. A.nnual Yellow C. Leaves wing-cleft, 

 lyre-shaped, unequally toothed. Root tapering. Petals 

 scarcely so long as the calyx. Pod curved, swollen. 

 Sisymbrium terrestre. E. B. 1747. C. 5. 49. Sb. 



207. 

 Banks of ditches. * Near the Diamond House. Sb. Merton 



College Meadow. Near Medley Lock. Otmoor. Bx. 

 An. June. 

 Stem about one f., nearly erect, branched, leafy. Ls. alternate or 



opposite, lobes confluent, i. e. run in with the mid rib of each 1. 



Fl. racemed, yellow, numerous, small. Fruit-stalks in cylindric 



clusters, partial stalks alternate, horizontal, each with a 



shortish, swelling pod. 



N. amphibium is peren. has pet. larger, pods smaller, style 

 longer. (^Discrim.) from N. sylvestre by its wing-cleft Is. minute 

 pet. and more swollen pods. 



N. amphibium. Amphibious Yellow C. Great Water 

 Radish. Leaves oblong, spear-shaped, wing-cleft, or 

 saw-toothed. Roots fibrous. Petals longer than the 

 calyx. Pod elliptical. Sisymbrium amphibium. E. 



