8 TRANSACTIONS OF THE [OCT. 7, 



distinguished from the eastern C. odorata var. minor, by its 

 oblong leaves, sometimes nearly twice as long as broad, with 

 narrow, acutish lobes, and the flowers still smaller with 7 to 8 

 rayed stigma. The identification of the American and Asiatic 

 plants has been made on specimens of C. pygmcBa from Khasia 

 (Hooker and Thomson) and Japan (Albrecht, 1861). As to the 

 relationship of Dr. Morong's C. Leihergii to the present species, 

 I am not yet willing to express a positive opinion. Dr. Morong 

 remarks, in his original description of the plant (Bot. Gazette, 

 xiii. 124), 'Meaves with a broad, open sinus and obtuse lobes" ; 

 but specimens recently received from Mr. Leiberg have the 

 sinus narrow, as in C. telragona, and the lobes quite as acute, 

 the laminae being of precisely the same outline ; this leaves prac- 

 tically nothing but the obtuse petals to distinguish it from the 

 species here discussed. Indeed, some of the inner petals are 

 much the same form as those of C. tetragona. 



Professor George Lawson has also examined the Canadian spe- 

 cimens here alluded to, and (loc. cit. 113) refers them to C. odo- 

 rata var. minor, but I cannot agree with him in this. Curiously 

 enough, in his otherwise exceedingly complete synopsis of the 

 NymphseaceEe he makes no mention of C. Leibergii. 



The leaves of C. tetragona are of much the same size and form 

 as those of NymplicBa micropliylla. 



Cardamine Douglassii (Torr.). 



Aral)is rhoml)oidea, Pers. {btilbosa, Muhl.), xar. purpurea, Torr. 



Amer. Jour. Sci. iv. 66 (1822). 

 Cardamine rotundifolia, var. ft Torr. & Gray, Fl. JST. A. i. 83 



(1838), and Arabis Douglassii, Torr., as synonym. 

 Cardamine rlioniboidea, var. inirpurea, Torr. Fl. N". Y. i. 56 



(1813), with the same synonym. 

 Cardamine bulbosa, var. purimrea, B. S. P. Prel. Cat. Antli. 



N. Y. 4 (1888). 

 C. rotundifolia, Hook. Fl. Bor.-Amer. i. 44; Wats. Bibl. Index, 



i. 54, not of Michaux. 



After a careful study of this plant in the field and herbarium, 

 I have come to agree with my friends, Judge Day and Professor 

 Macoun, that it is specifically distinct from the white-flowered 

 species with which it has been associated. The specific name 

 adopted appears to be the earliest one available, although it has 

 never, so far as I can make out, been published except as a 

 synonym. Dr. Torrey must have fully intended to print it as 

 Arabis Douglassii, and was later under the impression that he 

 had actually done so, for he uses the synonym on page 83 of 

 the "Flora of North America," referring to the place where he 

 published it as A. rhomboidea, var. purpurea (at least to within 



