Floristik und Systematik der Phanerogamen. 263 



Dams, Em Echinocereus rubescens n. sp. (Monatsschrift für 



Kakteenkunde. Jahrg. XV. 1905. No. 6. p. 92-93. Mit 



1 Abb.) 



Verf. theilt Abbildung und Besclireibung einer unter dem Namen 

 Echinocereus papillosus var. rubescens Hiidmann cultivirtcn Pflanze mit; 

 da indessen dieser Name unzutreffend ist, indem E. papillosus zu der Reihe 

 der Prostrail Schum. gebiört, während die beschriebene Pflanze unter die 

 Pectinati S. D. eingereiht werden muss, so schlägt Verf. vor^ den falschen 

 Namen durch Erhebung des Varietätsnamens zum Artnamen zu corrigiren. 



W. Wangerin (Halle a. S.). 



DUNN, S. T., Alien flora of B ritain. (West, Newman & Co., 



London. 1905. p. XVI and 208. Price: 5 shiUin.irs net.) 



The book contains data on the status and origin of 924 species of 

 British aliens; 123 of these are old — established weeds of uncertain 

 origin, 332 are due to horticulture and arboriculture, while 206 are aliens, 

 which have been introduced with grain and are of recent appearance 

 and little permanence. In his introduction the author first considers the 

 evidence, on which we rely in determining the nativity or allen character 

 of a species. A species is regarded as an allen when it is always found to be 

 connected with artificial surroundings; when a species has a disconnected 

 distribution, though occurriug in a natural habitat, it is often found that 

 it can be shown by geographical or other arguments, that it was intro- 

 duced thither by artificial means or from an artificial source. The chief 

 introducing agents and the way in which they operate are considered in the 

 latter half of the introduction. The list oi allen plants, which takes up 

 the greater part of the volume, is arranged in the order of the Genera 

 Plantarum; a considerable number of the species are placed in brackets, 

 these being forms, which are usually recorded as weeds from artificial 

 habitats only in our local floras but which the author regards as natives. 

 The book should prove very useful to British botanists and especially 

 ecologists. F. E. Fritsch. 



(ilLG, E. , Eine neue Kautschuk liefernde Liane, 



Clltandra SlmonL (Notizbi. Kgl. Botan. Garten u. Museum 



zu Berlin 1905. No. 36. p. 169—170.) 



Verf. beschreibt eine aus Nordwestkamerun stammende, aus- 

 gezeichneten Kautschuk liefernde Liane, welche Sich bei der Unter- 

 suchung als eine neue Art der Gattung Clltandra (Apocynaceae) heraus- 

 stellte; die vom Verf. unter dem Namen Cl. Slmonl GWg n. sp. beschriebene 

 Pflanze ist mit Cl. vlsciflua K. Seh., Cl. Barteri Stapf und Cl. nitida Stapf 

 verwandt, unterscheidet sich von diesen aber durch Blattbau, Blattnervatur 

 und Blüthenverhältnisse wesentlich. VV. Wangerin (Halle a. S.). 



[ÖREENE, E. L.], New or noteworthy species. XXX. 



(Pittonia. V. August 28, 1903. p. 107—114.) 



Includes the foliowing new names: — Trifolium anodon, T. brachy- 

 odon, T. decodon, Chaniaecrlsta camporuni, Amelanchler suhlntegra, 

 Rosa yalnacensis, R. aldersonü, Chrysothamnus larlclnns, Antennarla 

 mesochora, Dodecatheon laetlfloruni, D. sanctarum, Veronlca oxylobula, 

 V. crenatlfolla and Tlssa luteola. Trelease. 



ÖREENE, E. L., New Species o\ Polygon um. (Pittonia. 1903. 



V. p. 197—203.) 



Polygonuni linearifolluni (P. Bistorta linearifollum Watson), P. ce- 

 plialophorum, P. vulcanlcuni, P. jejununi, P. Bernardinum, P. glasti- 



