16 Floristik, Geographie, Systematik etc. 



Wangerin, W., Floristische Mitteilungen. (Zschr. Naturw. 

 LXXXI. p. 263-276. 1909.) 



Der erste Abschnitt der vorliegenden Arbeit enthält floristische 

 Beobachtungen über die Frühlingsflora von Rovigno in Istrien, 

 wobei den Standortsangaben für bemerkenswertere und seltenere 

 Arten eine kurze Schilderung des allgemeinen Landschaftscharakters 

 und der Vegetationsphysiognomie, insbesondere der Macchien, vor- 

 ausgeschickt wird. Die beiden folgenden Abschnitte enthalten eine 

 Aufzählung von neuen Standorten für weniger verbreitete Gefäss- 

 pflanzenarten einerseits des mittleren Teiles der Provinz Sachsen 

 (hauptsächlich der Umgebung von Halle a. S.) und andererseits der 

 Umgegend von Burg. W. Wangerin (Königsberg i. Pr.). 



Warming, El. , Saxifyagaceae.I. Morphology and biolog y. (The 

 structure and biolog y of arctic flowering plants I. 4.) 

 (Meddelelser om Grönland XXXVI. 69 pp. 40 fig. Copenhagen 1909.) 



Twelve species of Saxifraga and one species of Chrysosplenium, 

 all arctic, are described. 



In structure of stem, the species belong to the following 

 growth-forms: 



A. The Pnmiila-type. S. hieraciifolia, S. nivalis and 5. stellaris 

 have a vertical rhizome, with leaves in a rosette. The damper the 

 soil is, the quicker does the rhizome die away at the hinder end. 

 The inflorescence is borne upon a leafless peduncle, 



B. 5. cernua, S. rivularis, S. Hircuhis, and Chrysosplenium have 

 the Pi'imula-iype less pronounced, combined with the development 

 of bulbils or of runrfers with scale-leaves or imperfect leaves, and 

 adventitious roots. 



C. To the Sewpervivurn-type belong: 5. Aisoon and ßagellaris. 

 The principal stem dies away after flowering, lateral shoots are 

 horizontal. 



D. 5. groenlanäica and 5. tvicuspidata have "rhizoma multiceps", 

 the primary root remaining alive a long time probably in correla- 

 tion with the dry localities in which they grow. Vegetative propa- 

 gation takes place rarely or not at all. 



E. Creeping herbs are: 5. oppositifolia and 5. aisoides. 



The flowers are developed the year previous to that in which 

 they open, in perhaps all the species. The vegetation-period being 

 very short the flowering must be placed in early spring to enable 

 the seeds to ripen. Staminate flowers are rare, but pistillate flowers 

 appear to be common. Protandr3'^ is very common, but a slight 

 protogyn}^ may occur in some species. Self-poUination often takes 

 place. 



Fruit-setting and seed-formation is common in many species. 

 Those which either do not set seed at all or do so rarely, have 

 bulbils or simular means of vegetative propagation. Of S. stellaris 

 there is an almost flowerless form (f. comosa) bearing bulbils, and 

 this form seems to be an adaptation to the extreme arctic climate. 



Ove Paulsen. 



A-usgegeben t 5 Jtili lOlO. 



Verlag von Gustav Fischer in Jena. 

 Buchdruckerei A. W. Sijthoff in Leiden. 



