162 abstracts: botany 



These data make it possible to compare the products of different mines 

 or beds and to determine which is best adapted for any particular use. 

 The investigation also shows the importance of careful preparation for 

 the market, in the way of picking and washing. 



M. R. Campbell. 



BOTANY. — Three new plants from Alberta. Paul C. Standley. Smith- 

 sonian Miscellaneous Collections, 56 33 : 1-3. 1912. 

 The plants described are from a collection obtained in western Alberta 

 and eastern British Columbia in the summer of 1911 by J. H. Riley and 

 N. Hollister. Vagnera pumila, Artemisia laevigata, and Gaillardia 

 bracteosa are described as new while one new combination, Svida pubes- 

 cens ( = Cornus pubescens Nutt.) is formed. The Gaillardia is espe- 

 cially interesting, since it is the northernmost representative of the genus 

 so far discovered. P. C. S. 



BOTANY.— -A new leather flower fro7ii Illinois. Paul C. Standley. 

 Smithsonian Miscellaneous Collections, 56 34 : 1-3, pi. 1. 1912. 

 Viorna ridgwayi is described from specimens collected by Mr. Robert 

 Ridgeway in the summer of 1910 near Olney in southern Illinois. The 

 species is related to Viorna viorna, the common leather flower, but is 

 distinguished by the peculiar form of the leaves. A brief account is 

 also given of the trees and shrubs of the locality from which the type 

 comes. P. C. S. 



BOTANY. — Report on a collection of plants from the Pinacate region of 

 Sonora. J. N. Rose and Paul C. Standley. Contributions from 

 the U. S. National Herbarium, 16: 5-20, fig. 1, pis. 3-16. 1912. 

 An annotated list is given of the plants collected by Dr. D. T. Mac- 

 Dougal in the Pinacate region during the autumn of 1907. The expedi- 

 tion during which these plants were collected is described by Dr. W. T. 

 Hornaday in his book C amp-Fires on Desert and Lava. Altogether 83 

 species are listed, the type locality of each being given. Twelve new 

 species are described, the most of which are illustrated by line drawings, 

 and six new combinations are formed. J. N. R. and P. C. S. 



BOTANY. — Tumamoca, a new genus of Cucurbitaceae. J. N. Rose. 



Contributions from the U. S. National Herbarium, 16: 21, pi. 17. 



1912. 

 Tumamoca macdougalii represents a new genus of this family, allied 

 to Ivervillea. The type was collected by Dr. D. T. MacDougal on 

 Tumamoc Hill on which the Desert Laboratory of the Carnegie Institu- 

 tion is situated, near Tucson, Arizona. J. N. R. 



