92 Botanisches Centralblatt. 



munication de M. Nicolas sur la Mercuriale. (Bull. Soc. Hist. nat. 



Afrique. Nord. X. p. 76—77.) 

 Bergman, H. F. 1918. Flora of North Dakota. Separate report from 



the sixth biennial report of the Director of the North Dakota Soil 



and geological Survey. (Tribüne State Printers and Binders. 



Bismarck, N. D. [1918]. 8«. p. 151-372.) 

 Berry, E. W. 1919. Eucalyptus never present in North America. 



(Science. 2. IL. p. 91—92.) 

 Bertsch, K. 1918. Pflanzengeographische Untersuchungen aus Oter- 



schwaben. (Jahrh. Ver. vat. Natk. Württemberg. LXXIV. p. 



69—172. 20 B.) 

 Blake, S. F. 1919. Revision of Ichthyomethia, a genus of plants used 



for poisoning fish. (Journ. Washington Ac. Sc, IX. p. 241—2.52.) 

 Boerker, R. H. D, 1919. Our national forests. (New York, The Mac- 



millan Co. 1919. LXIX, 238 pp. 80 ill.) 

 Bowles, C. W. 1919. Systematic Botany. (Amen Bot. XXV. p. 57—63.) 

 Bush, B. F. 1919. The Missouri Muhlenbergias. (Amer. Midland Nat. 



VI. p, 17—28.) 

 Campbell, D. H. 1919. The derivation of the flora of Hawaii. (Publ. 



Leland Stanford Jr. Univ. Ser. 1919. 34 pp.) 

 Candolle, C. de 1919. ßegoniaceae centraliamericanae et ecuadorenses. 



(Smithsonian misc. Coli. LXIX. 12. Publ. 2533.) 

 Chamberlain, C. J. 1919. The living Cycads. (Chicago, Univ. Press. 



1919. 120. XIV, 172 pp. 91 f.) 

 Clokey, L W. 1919. Carex notes. (Rhodora. XXI. p. 83—85.) 

 Cogniaux, A. 1916. Cucurbitaceae congolanae novae herbarii Bruxel- 



lensis. (Bull. Jard. bot. Etat Bruxelles. V. p. 109—116.) 

 Darlington, H. T. 1919. Weed Immigration into Michigan. (Report 



Michigan Ac. Sc. XX. p. 261—267. 1 f.) [Starting with 47 weeds 



in 1839 there has been an increase of about 100 in three quarters 



of a Century. Of the total weeds in the State about 66% are intro- 



duced and 34% native. — W. B. Mc Dougal.] 

 Deam, C. C. 1919. Trees of Indiana. (Bull. no. 3, State Board Indiana, 



Indianapolis. 1919. 3. 299 pp. 132 pl.). [An octavo constituting a 



reprint of a portion of the Report of the same Board for 1911, 



with a few notes and corrections. — Trelease.] 

 Deane, W. 1919. Amsinckia in New England. (Rhodora. XXI. p. 38—40.) 

 Detmers, F. 1919. Two new varieties [viride and rubrocarpum] of 



Acer rubrum L. (Ohio Journ. Sc. XIX. p. 235-237. 2 pl.) 

 Dreyer, J. 1919. Die Moore Kurlands nach ihrer geographischen 



Bedingtheit, ihrer Beschaffenheit, ihrem Umfange und ihrer Aus- 

 nutzungsmöglichkeit. Hamburg. (Veröffentl. geogr. Inst. Hamburg. 



1919. VIII, 261 pp. 1 K. 4 F.)^ 

 Drude, 0. 1919. Die Elementar- Assoziation im Formationsbilde. (Ber. 



freien Ver. Pflanzengeogr. f. 1917/1918. 1919. p. 45-82.) 

 Drude, 0, 1919. Formationen u. Relikt-Standorte des Kulm- und 



Diabas-Durchbruches an der oberen Saale. (Ber. freien Ver. 



Pflanzengeogr. f. 1917/18. 1919. p. 160-179.) 

 Engler, A. und E. Irmscher. 1919. Saxifragaceae-Saxifraga. II. 



Pars generalis von A. Engler. Das Pflanzenreich. 69. Heft p. 



449_709 ill. und p. 1—47. ill. (Leipzig, W. Engelmann. 1919. 8°. 



Preis 40 M.) 

 Farwell, 0. A. 1919. Bromelica (Thurber): a new genus of grasses. 



(Rhodora. XXI. p. 76—78.) 

 Farwell, 0. A. 1919. Tsuga americana (Mill.) Farwell, a final word. 



(Rhodora. XXI. p. 108—109.) 



