220 Rhodora [October 



RAPHANUS. 



R. Raphanistrum L. Fields and waste places, common throughout. 

 R. sativus L. Garden escape, occasional. 



RAPISTRUM. 



R. rugosum (L.) Berger., subsp. Linnaeanum (Boiss. & Reut.) 

 Rouy & Folic. Waste ground, Mill Dam, Boston (C. E. Faxon, 

 — , 1873; specimen in Gray Herb.). A foreign introduction. 



R. rugosum (L.) Berger., subsp. orientale (L.) Rouy & Fouc. 

 Charlestown (C. E. Perkins, July 15, 1882; specimen in herb. N. E. 

 Botanical Club). " This specimen is rather poor and doubtful, but 

 it lias the upper segment of the fruit abruptly contracted into a slender 

 style, instead of attenuate, as in subsp. Linnaeatnan," B. L. Robinson. 

 A foreign introduction. 



RORIPA. 1 



R. Armoracia (L.) Hitche. Wet places, persistent and spreading; 

 frequent throughout. 



R. GLOBOSA (Turcz.) v. Hayek. Rubbish heap, Cambridge (IF. 

 Deane, Sept. 30, 1884; specimen in herb. W. Deane). A foreign 

 introduction. 



R. Nasturticm-aquaticum (L.) Schinz & Thell. Ditches and 

 pools; frequent and abundant in central and southern portions, rare 

 in Essex and northern Middlesex counties. 



1 In regard to the nomenclature of this genus, long familiar as Xasturlium, then changed to 

 the earlier lioripa, then in certain recent works, such as the last edition of Gray's Manual, 

 trealed under the still earlier name Radicula, it may be said that in accordance with the first 

 provision of Article M of the International Rules of Botanical Nomenclature the name Radicula 

 must he abandoned since it is a morphological term. This hcing the case the next possible 

 name is llorippa Scop. Fl. Cam. ed. 1, 520 (1700), but this name seems to have been a misprint, 

 for il was corrected by its author, Scopoli, in the second edition of the same work, to lioripa. 

 Opinions differ as to whether this name must be accepted in its original form, Rorippa, as 

 maintained by Briquet, Prodrome de la Flore Corse, ii. 28 (1913), or whether it may be allowed 

 to stand in its corrected form, Roripa. In Art. 57 of the International Rules there is clear 

 implication that typographical and orthographical errors in plant names may \ie corrected. 

 The matter then resolves itself into the question whether the form Rorippa was in fact a typo- 

 graphical or orthographical error. The etymology of the name is not evident, but there would 

 seem to be no clearer ground for supposing that a name was a misprint than the fact that it was 

 consistently corrected in form by its author in his subsequent use of tin' name. II may be 

 further stated that in using here the name in the form Roripa, we are following the example of 

 the majority of writers who have accepted the name in either of its forms 



