426 Floristik, Geographie, S3'stematik etc. 



weeds, and the areas devoted in the United States to the culti- 

 vation of grasses. Nearly 200 pages of the book are given to a 

 botanical treatment of the gramineae, the concluding chapter giving 

 a concise summary of the rules and practices in nomenclature and 

 a list of publications on taxonomic agrostology. Trelease. 



Koenen, O., Ergänzungen zur Flora von Paderborn. (41. 

 Jahresber. westfäl. Provinz. -Ver. Wiss. u. Kunst, p. 101 — 103. 

 Münster, 1913.) 



In Baruch's Flora von Paderborn fehlen folgende Pflanzen 

 als Bürger des Gebietes: Helianthemum Chamaeasttcs Müll., Trifolium 

 fnontantan L., Helosciadiuni repens Koch, Chrysocoma Linosyris L., 

 HypocJioeris maculata L., Brunella grandißora L., Zanichellia pedi- 

 cellata W., Liparis Loeselli Rieh., Lycopodiuni complanatuni L. var. 

 chamaecyparissus A.Br. Matouschek (Wien). 



Koenen, O., Ueber einzelne Folgen des trockenen Som- 

 mers für die Pflanzenwelt. (41. Jahresber. westfäl. Provinz.- 

 Ver. Wiss u. Kunst, p. 101. Münster, 1913.) 



Die Werse sank 1911 um 2 m; ein grosser Teil der Exemplare 

 von Stratiotes aloides (Krebsschere) starb bei Pleistermühle ab. 

 1913 erschien die Pflanze wieder, aber sie ist stark von Elodea 

 canadensis bedrängt. Die durch Samen sich fortpflanzenden Arten 

 aber hielten sich gut, denn 1912 war viel Batrachium divaricatum 

 Wimm. und Phellandrium aquatictim zu sehen 



Matouschek (Wien). 



Mathews, F. S., Field book of American trees and shrubs. 

 (lö*^. XVIII. 465 pp. New York and London. G. P. Putnam's Sons. 

 1915. Price $ 2.00.) 



A descriptive manual referring to the commoner or more striking 

 species of the country, systematically arranged after the Engl er 

 and Prantl grouping of families and conformed to the international 

 rules of nomenclature. Seventy distribution maps for as many species 

 are given as well as a number of maps showing the general facts 

 of meteorology, soll, geology, etc.; habit of species is illustrated in 

 50 crayon plates and 16 in colors, and innumerable line Sketches of 

 leaf, flower and fruit Supplement the descriptions. Brief summary 

 keys are given to leaf and bark characters, to elucidation of which 

 latter three plates are devoted. Trelease, 



Piper, C. V., Andvopogon halepensis and Andyopogon Sorghum. 

 (Proc. Biol. Soc. Washington. XXVIII. p. 25—44. Mar. 12, 1915.) 



An extensive analysis of European and American herbarium 

 malerial, — the rhizomatous perennial for ms being grouped under 

 the former name, and the annuals (in cold regions) wihtout rhi- 

 zomes under the latter. The following new names are proposed: 

 Andropogou halepensis anatherus , A. halepensis milifonuis {A. niili- 

 forniis Schultes), A. halepensis siamensis, A. Sorghum exiguus 

 Forsk.), A. Sorghum Eiche}igeri, A. Sorg/ium sudanensis. — The 

 "Sudan grass" now extensively cultivated in the United States 

 where it lacks the pernicious tenacity of the perennial "Johnson 



