3S6 BOTANICAL GAZETTE [November 



region (BoT. Gaz. 31:208. 1901), also to Gattinger^s Tennessee flora 

 (BoT. Gaz. 32:428. 1901). in which the various regions of the state are 

 described as to their vegetation. 



R. M. Harper (Bull. Torn Bot, Club 27:320-341; 4i3-43<5. 1900) has 

 given some interesting data concerning the flora of Georgia. Northern and 

 southern Georgia are quite different, the former having a flora like that 

 farther north, while southern Georgia has true southern types. Lists are 

 given of many plant communities. More recently (Science 16:68-70. 1902) 

 the same author has written a brief account of the botanical features of the 

 Lafayette and Columbia formations. He finds that it is possible to distm- 

 guish these formations by the plants which grow upon them. Eriogonum 

 tomentosum and Froelichia Floridana especially characterize the Columbia 

 sands. Harper (Bull. Torn Bot. Club 29 : 383-399. 1902) has also published 

 a paper which deals with the distribution of Taxodium. ' He thinks that 

 there are two species, 7*. distichum and T. imbricarium, and that the latter 

 always occur on Lafavette soil, the former never. It seems to the reviewer 

 that T imbricaritim will prove to be merely an ecological variety, similar to 

 varieties of ferns and violets which Sadebeck years ago experimentally trans- 

 formed to the parent species. 



C. L. Pollard (/'/aw/ rr^r/^ 5: 8-10. 1902) notes how the mangroves 

 and other species assist in the formation of the Florida keys, commencing 

 where the corals leave off. Rhizophora is the pioneer, but is soon followed by 

 Laguncularia and Conocarpus. When the mangroves die out, we have the 

 "hammock" land. — Chas. Mohr's flora of Alabama has been reviewed in 

 these pages (Box. Gaz. 32 .'371. 1901). This work is on^ of the most com- 

 plete and satisfactory that has yet appeared in this country, being nothmg 

 less than a mine of floristic and ecological information. He notes that in 

 Alabama Merriam's life zones correspond with the geological formations 

 rather than with the climate. The hemlock and sweet birch occur far from 

 their main range, and are relicts of the glacial invasion. A number of 

 interesting endemic and local forms are noted. — Lloyd and Tracy (Bull. 

 Torr. Bot, Club 28:61-101. igoi) have made an ecological study of the 

 insular flora of Mississippi and Louisiana. This paper is a noteworthy addi- 

 tion, especially as it gives us a means of comparing our northern and south- 

 ern coasts. The islands are deposits of Mississippi river detritus; in some 

 cases the mud is still the surface material, in other cases it is covered by 

 sand. On the beach northern forms like Salsola and Strophostyles are 

 mingled with the more tropical Ipomoea. Dunes are formed by Paniciwi 

 amarum and Uniola. The palm Serenoa, and other plants form "pedestal* 

 dunes. Sand plains are described of various types, culminating in a forest 

 of pines and live oaks with an undergrowth of palms. A unique set of 

 vegetation conditions is found on the shell strand. Among the leading salt 

 marsh plants are Batis, Avicennia, and Salicornia. 



A. J. Filters (U. S. Fish Commission BuU. 1901 : 57-79) contributes an 



