254 Floristik, Geographie, Systematik etc. 



Collins, F. S., Three plants with extension of ränge. (Rho- 

 dora. XV. p. 169—172. Sept. 1913.) 



Referring to Panicum Bicknellii, Potentilla tridentata, and 

 Juncus bufonius halophilus. Trelease. 



Cowles, H. C, The -American Phytogeographic Excur- 

 sion. (August and September 1913. Second Announcement, June 

 17, 1913; First Section, New York to Lincoln; Second Section, 

 Lincoln to Salt Lake City; Third Section, Salt Lake City to San 

 Francisco; Fourth Section, San Francisco to Cannel; Fifth Section, 

 Cannel to New York.) 



Each one of the section programs gives the time- of leaving 

 and arriving at the stopping places, the itinerary, the railroad and 

 hotel accomodations, the botanists of different parts of United 

 States designated a5 leaders, and the papers published on the 

 different local floras. A brief, but comprehensive sketch, of the 

 Vegetation and the most interesting plants of such region, add 

 much to the value of the five programs. Harshberger. 



Dachnowski, A., The Nature of the Absorption and Tole- 

 rance of Plants in Bogs. (Botanical Gazette. LIV. p. 503—513. 

 Dec. 1913.) 



This study is a continuation of similar ones which have pre- 

 ceded. The author finds that the character of the obligate bacterial 

 flora and the nature of the organic Compounds produced form 

 very important factors in the relative fertility of peat sorts, in the 

 causes of Vegetation succession, in the distributional and genetic 

 relationship of associations, and in the characteristic xeromorphy 

 of both ancient and modern bog Vegetation. Other facts of similar 

 import are emphasized in a paper in which the transpiration data 

 of various species is tabulated. Harshberger. 



Fernald, M. L., The indigenous varieties of Prunella vul- 

 garis in North America.' (Rhodora. XV. p 179—186. Oct. 1913.) 



The following are differentiated: 1) P. vulgaris, with a f. albi- 

 flora, 2) P. vulgaris var. hispida, 3) P. vulgaris var. lanceolata with 

 ff. Candida, iodocalyx and rhodantha, 4) P. vulgaris var. aleutica, 

 5) P. vulgaris var. calvescens, and 6) P. vulgaris var. atropurpurea, 

 of which the forms of var. lanceolata and the following varieties 

 are differentiated as new. Trelease. 



Harper, R. M., A Botanical Gross Section of northern 

 Mississippi, with Notes on the Influence of Soil on 

 Vegetation. (Bull. Torrey Bot. Club. XL. p. 377—399. 3 pl. 

 Aug. 1913.) 



The Vegetation of the Cretaceous prairie region, the Pontatoc 

 Ridge, the post oak flatwoods, the eocene sea hills, the yellow 

 loam region, the Clefif region, the Yozoo delta, the banks of the 

 Mississippi is considered in detail with lists of trees, shrubs and 

 herbs. The author finds that Pinus palustris, Taxodium imbricarium , 

 Tillandsia, Orchidaceae, Myrica cerifera, iMagnolia {a.11 species), Ericaceae 

 are absent from the region covered in his travels. The absence of 



