Floristik, Geographie, Systematik etc. 115 



die Pflanze auf die Produktion von Samen aus der Frühjahrsform 

 verzichten konnte. Matouschek (Wien). 



Hall, C, The evolution ofthe Eucalypts inrelationto 

 the cotyledons and seedlings. (Proc. Linn. Soc. N. S. Wales. 

 XXXIX. 3. p. 479-532. 12 pl. 1914.) 



The genus Eucalyptus is remarkable not onl}- from an economic 

 point of view, but also by reason of the information it furnishes 

 on the general problem of evolution. Lubbock states that in the 

 majority of plants the cotyledons are entire: in the Eucalypts, ho- 

 wever, emargination is, in a greater or less degree, more common. 

 As this appears to be a response to Australian xerophytic condi- 

 tions, it indicates that the species vs^ith simple entire cotyledons 

 are those of the more primitive type and this is borne out by re 

 searches on the botanical and chemical characteristics of the genus. 

 The corymbosa group has been considered the most primitive and 

 to most closely approach the allied genus Angophorn. Accompanying 

 changes in the cotyledons, there has been a change in the essential 

 oils. The corymbosa type is associated with a pinene oil, without 

 eucalyptol. In higher groups we find eucalyptoi, phellandrene and 

 piperitone in varying proportions or a eucalyptolpinene oil. Finall}^ 

 the group having Y-shaped cotyledons is usually associated with 

 eucalyptol, pinene and aromadendral. E. M. Jesson (Kew). 



Hill, A. W., Notes on South African Santalnceae. (Kew Bull. 

 Mise. Inform. NO. 3. p. 97-102. 1915.) 



Thesidiinn. It is pointed out that the genus Thesidiurn falls 

 naturally into two divisions, one in which the male and female 

 plants are quite simxilar in general appearance and a second in 

 which they are strikingly unlike. This is borne out by the fact that 

 in the past the male and female plants have been described as 

 distinct species. The male and female flowers are not markedly 

 different in this small genus. it is therefore necessary to separate 

 the species almost entirely on vegetative characters. The new spe- 

 cies described by the author are: T. minus, T. longifoliuni and T. 

 fruticulosum. 



Notes on the genera Osyris, Rhoiacarpos and Osyridicarpos 

 foUow; the new variety Osyris nbyssinica Höchst., var. speciosa being 

 described. Finally the genus Grubhia is discussed and the history 

 of the name Frisia as applied to the genus Thesium. 



E. M. Jesson (Kew). 



Hofmann, A., Die Vegetationsverhältnisse in Tripolita- 

 nien. (Oesterr. Vierteljahresschr. Forstwesen, N. F. XXXIII. 1. 

 p. 31-38. Wien 1915.) 



Das Hinterland der Stadt Tripolis stellt eine Flachküste dar, 

 eine grosse Dünenebene, die stellenweise von Salzseen unterbrochen 

 wird. Diese Dünenregion geht gegen das Land zu allmählich in die 

 Binnensteppe über, welche wie die Küste ausgedehnte bewegliche 

 Sandflächen enthält. Sie erstreckt sich bis zum Fusse des steilab- 

 fallenden Hochplateaus Gebel Garian. das viele tiefe Erosions- 

 rinnen in die Steppe sendet; die Uredi erreichen aber die Küste 

 nicht. Bei Ho ms ist die Küste hügelig. Zwei Zonen sind im Ge- 

 biete (im Wilajets Tripolis, jetzt Italien gehörend) zu unter- 



