228 
36.“ Elements of Plant Anatomy.” Ginn & Co. Boston. 1895. 
37. Bull. Torr. Bot. Club, 23: 278-281. 1896. ‘ What 7s meant 
by Stem and Leat.” 
38. Bull. Torr. Bot. Club, 24: 214. 1897. Review of T. Chalk- 
ley Palmer, “Demonstration of Absorption of Carbon Dioxide 
and of the Generation of Oxygen by Diatoms.” (Proc. Acad. 
Nat. Sci. Phila. 1897.) 
Studies in the Botany of the Southeastern United States.—X. 
By JOHN K. SMALL. 
THE GENUS TRADESCANTIA IN THE SOUTHERN 
STATES.* 
Six years’ experience with Zvadescantia, both in the field and in 
the herbarium, has convinced me that there is something funda- 
mentally wrong in the several existing treatments of the genus. — 
Since I became interested in the forms occurring in the Southern 
States Dr. J. N. Rose has arranged to monograph the North 
American Commellinaceae and I publish these notes with his 
knowledge and consent. 
Linnaeus described a single North American species, namely, 7. 
Virginiana.t Of American authors, Walter,t Michaux,§ Parsh,|| 
Elliott § and Darby,** each described two species, while Chap- 
* I have had the privilege of examining material in the herbaria of Lafayette Col- 
lege, through Professor Thos. C. Porter, and of Franklin and Marshall College, through » 
Professor J. S. Stahr. Professor S. M. Tracy has sent me specimens at various times. 
I have also received material from regions beyond the area with which this paper is 
concerned, from Mr, B. F, Bush, Rev. E. J. Hill and Rev. J. M. Bates. 
+ Sp. Pl. 283. 
} FL Car. 119. 
§ Fl. Bor. Am, 119. 
| Fl. Am. Sept. 218. 
Jj Bot. S. C. & Ga. 380-381. 
** Bot. S. States, 547-548. 
