TETRADYNAMIA— SILIQUOSA. Sisymbrium. 195 



4. N. amplubimii. Amphibious Yellow Cress. Great 



Water Radish. 



Leaves oblong, pinnatifid, or serrated. Roots fibrous. Pe- 

 tals longer tlian the calyx. Pod elliptical. 



N. amphibium. Br, hi Alt. H. Kew. v. 4. 110. DeCand. Syst. v. 2. 

 19G. Comp.ed. 4. 1 12. Hook. Scot. 20\. 



Sisymbrium amphibium. Limi. Sp. PI. 9 1 7. Willd. v.3. A9\. Ft. 

 Br.702. Engl.Bot.v.26.t.lS40. Ft. Dan. t. 984. 



5. (not Nasturtium) palustre repens latifolium majus. Mich. Hort. 

 Ear (Hit. 89. 



Radicula n. 486. Hull. Hist. r. 1 . 2 11 . 



R. sylvestris seu palustris. Rail Sijii. SOI ; but not of J. Bauhin. 

 Raphanus aquaticus. Ger. Em. 240. f. 

 R. aquaticus alter. Bauh. Prodr.'SS.f, good. 

 R. syUestris officinarum aquaticus Lob. /c. 319./. 

 Broad Water Radish. Petiv. H. Brit. t. 49./. 8. 

 (3 Raphanus acjuaticus. Bauh. Hist. v. 2. 867./. 

 (ireat Jagged Water Radish. Petiv. H. Brit. t. 49. f. 10; copied 

 from Bauhin. 



In rivers, ditches, and places about tlieir banks, not constantly 

 overflowed, frequent. 



Perennial. June — August. 



Roots long and stringy, perpendicular, not creeping, but throwing 

 out numerous fibres, such as proceed from the lower parts of 

 the trailing or floating, wide-spreading, leafy, striated, not much 

 branching, stem. Leaves generally smooth, but occasionally 

 downy when growing in dry situations ; the lowermost on long 

 stalks, deeply pectinated underwater, otherwise elliptic-lanceo- 

 late, cut, or serrated ; upper ones ses^^ile, or clasping, oblong, 

 pectinated, serrated, or nearly entire, all varying greatly accord- 

 ing to the depth of the water, or strength'cf the current ; on 

 such plants as grow entirely out of the water, the leaves are 

 smalliM-, broader, and merely serrated. Fl. small, bright yellow, 

 plentiful, in aggregate clusters. Pet. always longer than the 

 calijx. Pods usually small and abortive, roundish, tipped with 

 the 5/y'e often as long as themselves. 



This plant is noticed by the celebrated M. Chateiiubriand, in his 

 account of England, for its wonderful powers of increase by root. 

 He observed it in the river near Heccles, where he long resided as 

 an emigrant, and his rather florid description has excited wonder 

 and curiosity in ma.iy, who daily, perhaps, pass over, without 

 regard, several noUss interesting works of their Creator. Some 

 of .M. DeCandolle's references belong to the foregoing. 



y^. SlSYxVJHHIUM. lU'dgc-iiiustard. 



linn. Gen. [\?>S. Juss. 239. Fl.Br.700. Comp.ed. A. liJS. Br. 

 in Ait. H. Kf'ir. V. 1. I I I . IhCind. Sus\ v. 2. 4o8. 



