Mr. Schweinitz on the Genus Viola. 63 



wise different, and that of the laciniae of the Calyx still more 

 strikingly ; not to mention the stigma. Mr. Z. Colhns of 

 Philadelphia has before me, according to Nuttall, consider- 

 ed this a distinct species — and it is assuredly the sororia of 

 Wildenovv. — May. 



Note. The following species so amply described by Mr. 

 Nuttall and Michaux is the only one of this family, with which 

 I am utterly unacquainted ; as I have never met with any 

 stemless viola having yellowish flowers. It appears to me to 

 form a transition from the bluish petalled acaulescent Violae, 

 to the white petailed ones ; which upon the whole are so 

 manifestly different, in their whole habitof inflorescence, that 

 a very good subdivision of the family might b6" established, 

 dividing it into : a) Violae acaules, floribus papilionaceis, 

 majoribus, coerulescentibus: (b) Violae acaules, floribus 

 regularioribus, minoribus, candidis, between which V. ro~ 

 fundifoUa, would be intermediate, and clandestina an appen- 

 dix. 



The white flowers sometimes and indeed frequently met 

 with in all the foregoing species, all shew, that it is owing to 

 a fading of the blue that they are white, while those of the 

 proposed white subdivision as plainly demonstrate the con- 

 trary; besides their difference of shape and size. 



11. Species. V. rotundifolia. Michaux. 



Nuttall p. 149. n. 7. Michaux p. 150, 



Elliott p. 298 n. 4. 



V. acaulis. Foliis crassis, magnis, orbiculato-cordatis, 

 sinu clauso, leviter dentatis, terrae adpressis, glabriusculis. 

 Petiolis pubescentibus. Floribus lutescentibus, in scapis 

 brevibus ante foliorum expansionem. Fetalis 6inis latera- 

 libus striatis, subbarbatis, striis 3, barba interruptis, infimo 

 minori, striis bifidis, lineis cartilagineis transversalibus. 

 Calycis laciniis oblongis obtusis, Stigmate glabro, minori, 

 recurvo in stylo brevi crasso. 



Scapis brevibus. (Nuttall.) 



This remarkable species has been found on the shady 

 banks of Wishahikon near Philadelphia by Mr. Rafinesque 

 and Nuttall ; the latter has likewise met with it in the moun- 

 tains of North-Carolina. I have not been so fortunate a? 

 yet. It is undoubtedly a very distinct species. Mr. Pursch 

 has very improperly cited Michaux's plant to his clandestina 

 with which it can faave no affinity whatever. 



