270 INDEX TO AMERICAN BOTANICAL LITERATURE 
Van Tieghem, P. Sur les Héliotropiacées. Ann. Sci, Nat. Bot. IX. 
4: 261-271. D 1906. 
Viguier, R. Recherches anatomiques sur la classification des Aralia- 
cées. Ann. Sci. Nat. Bot. IX. 4: 1-208. Jl 1906; 209, 210. D 
1906. 
Warnstorf, O. Neue Sphagna aus Brasilien. Beih. Bot. Centralb. 
20°: 128-130. 1906.  [Illust.] 
Description of 7 new species and I new variety. 
Wheeler, W. M. An ethological study of certain maladjustments in 
the relations of ants to plants. Bull. Am. Mus. Nat. Hist. 22: 
403-418. £/. 63-68. 17 D 1906. 
Whitfield, R. P. Notes on some Jurassic fossils from Franz Josef land, 
brought by a member of the Ziegler Exploring Expedition. Bull. 
Am. Mus. Nat. Hist. 22: 131-134. p/. 78, 79. 26 My 1906. 
Mentions a few fossil plants. 
