f 



191 7] CURRENT LITERATURE 325 



when much clearer ones of the same objects are already available.— D. S. 

 Johxsox. 



MINOR NOTICES 



North American flora. — The third part of Vol. 34 continues the presenta- 

 tion of Carduales by Rydberg,* including the completion of the Tageteae 

 and the Anthemideae. In the Tageteae 22 genera are recognized, the last 

 5 being presented in this part. Of these the large genera are Pedis with 71 

 species (11 new) and Porophyllum with 42 species (10 new). A new genus 

 (Hydropedis) is described, based on Pedis aquatic a Wats. 



The recognized genera of Anthemideae number 21, a considerable number 

 of them being segregated from more familiar genera. The largest genus is 

 Artemisia with 120 species (29 new), followed by Achillea with 24 species 

 (6 new). The other genera are represented by comparatively few species. 

 Three new genera are described as follows: Vesicarpa, based on Artemisia 

 potentilloides Gray; Chamartemisia, based on Tanacetum compadum Hall; 

 Artemisiastrum, based on Artemisia Palmeri Gray. — J. M. C. 



The theory of evolution. — Scott 4 has made an excellent restatement of 

 the evidences of organic evolution. The somewhat hackneyed subject is 

 enlivened by a forcible and very readable presentation. The book is the result 

 of the organization of 6 lectures (the Westbrook Lectures for 1914). In addi- 

 tion to the evidences from classification, comparative anatomy, embryology, 

 paleontology, and geographical distribution, the author presents evidence 

 derived from domestication, from blood tests, and from experiment. 



The opening chapter gives a brief historical review of theories of evolution 

 and a concise statement of the present status of the question. I have seen no 

 better presentation of this body of data for both biologist and general reader 

 than that given in this little book. My only criticism is that it is insufficiently 

 illustrated, although the few illustrations used are well chosen — H. H. Newman. 



A moss flora. — Grouts has published a very convenient list of the moss 

 flora of all counties of New York and New Jersey adjacent to New York City. 

 The moss flora of this area has probably been explored more thoroughly than 

 that of any other region of the United States. Numerous keys make the 

 recognition of genera and species relatively easy, and the excellent photographic 

 plates illustrate the genera. Such a publication should stimulate the study of 

 a very interesting flora, for, as the author remarks, "in and around New York 



3 Rydberg, Per Axel, North American Flora 34-'part 3. pp. 181-288. Cardu- 

 ales: Carduaceae{ Tageteae, Anthemideae). New York Botanic Garden. 1916. 



« Scott, \Y. B., The theory of evolution. 8vo. pp. vii+183. Xew York: Mao 

 millan. 1917. 



s Grout, A. J., The moss flora of New York City and vicinity. 8vo. pp. 120. 

 pis. 12. Xew Dorp (N.Y.): published by the author. 1916. 



