RADICULA. 113 
The Genus Radicula. 
It has always been with reluctance, and under a mental pro- 
test, that I have in recent years employed the generic name 
Roripa; for I have known that this genus of the yellow water- 
cresses obtained its first recognition as a type distinct from the 
common water-cress, with Dillenius; and that this author as- 
signed it the generic name RapicuLa (Dill. gen. 121 (1719); 
Hill. Brit. Herb. 264 (1756); Moench, Meth. 262 (1794). This 
name, then, by law of priority, is the only name the type can 
claim under that law; and, as I long since determined to employ 
this name in a monograph of the North American Cruciferae, 
which I may hope to issue in no very distant future, the pres- 
ent paper, in which I shall merely indicate the names of our 
species under the rightful generic caption, will be in nature 
allied to several others already published in the current volume. 
Of course, the “ R.” initial to each of the following para- 
graphs stands for RapicuLa. When there is occasion to cite 
oripa its synonym, it will be cited in full. 
There is no need of repeating here the species listed under 
the correct name by Moench. 
R. stnuata. Nutt. in T. G. under Nasturtium, 
R. SESSIFLORA. Nutt. Le = 
RK LYRATA. Nutt. Le af ei 
R. OBTUSA. Nutt. Le ge 
R. poLymorpHa. Nutt. Le “ e 
R. timosa. Nutt. l. c. z o 
R. cuRVISILIQUA. Hook. PL “ Sisymbrium, 
R. SPHAEROCARPA. Gray, Pl. Fendl. under Nasturtium. 
R. CURVIPES. Greene, Pitt. iii. «< — Roripa. 
R. OCCIDENTALIS. Greene, Fl. Fr. «Nasturtium. 
R. DICTYOTA. Greene, Le ; e a 
R. MULTICAULIS. Greene, Pitt. iii. s Roripa 
R. TENERRIMA. Greene, Eryth. iii. x eg 
R. CALYCINA. Engelm. Warren Rep. “ Nasturtium 
LEAFLETS, VoL. I, pp. 118-128. Nov. 24, 1905. 
