98 Floristik, Geographie, Systematik etc. 



Strychnos est une baie. L'etude de la distribution des Strychnos 

 dans l'Asie Orientale continentale demontre le caractere mixte 

 de la flore de l'Indo-Chine, qui est composee d'une part d'ele- 

 ments Indiens et chinois, d'autre part d'elements malais. 



J. Offner. 



Dunlop, G. A., Field notes on the plant associations of 

 Hatchmere and Flaxmere. (Lancashire Naturalist, III. 22. 

 p. 315—319. 1910,) 



The Cheshire"meres", especially in the Delamere Forest 

 area have still to be monographed as interesting examples of low- 

 land marsh and bog Vegetation. This contribution compares in a 

 general way the two "meres" named, and gives the habitats for 

 most of the rarer and some of the commoner species. 



W. G. Smith. 



Elgee, F., The Vegetation of "Swiddens" in North-east 

 Yorkshire. (Naturalist. 636. p. 14—20 and 637. p. 77—80 ill. 1910.) 



"Swidden" is the name in this locality for a tract af moorland 

 recently burned according to the practice in Britain of periodi- 

 cally burning portions of moorland to promote a growth of young 

 Calluna suitable for sheep and grouse. The author has observed the 

 planls which appear from the time of burning tili, after several 

 years, Calluna is again dominant. These plants vary according as 

 the subStratum is wct or dry, and peat or sandy humus. The tirst 

 Vegetation may be Lichens {Cladotiia), Mosses {Polytrichuni, etc.), 

 or sometimes annual plants (e. g. Aira praecox). Succeeding stages 

 exhibit a temporary dominance of sub-dominant species of the final 

 association; on moist peat Juncus sqiiarrosiis, Nardus stricta and 

 Molinia depauperata may occupy the ground, or Erica Tetralix; in 

 rocky places Pteris aquiUna and Vacciniun^ Myrtillus become con- 

 spicuous. It is probable that in this district, as in other parts of 

 Britain, the continued periodic burning is ultimately injurious to 

 the Calluna and favours the dominance of plants which originally 

 were sub-dominant elements of the Calluna association. 



W. G. Smith. 



Geze, J. B., Le Typha angustata dans la partie occidentale 

 du bassin mediterraneen. (Bull. Soc. bot. France. LVII. p. 

 211—216. 1910.) 



Le Typha angustata Bory et Chaub. est bien plus repandu 

 qu'on ne l'a indique jusqu'ici. Depuis que l'auteur l'a decouvert dans 

 les marais de Fos (Bouches-du-Rh6ne), l'examen de nombreux 

 echantillons d'herbiers lui a montre que l'aire de cette espece com- 

 prend tout le bassin de la Mediterranee, au lieu de s'arreter vers 

 l'W., comme on le croyait, ä la Grece et ä la Cyrenaique, et 

 s'^tend ä FE. jusqu'au Japon. Le T. angustata se substitue au T. 

 angustifolia L. dans les parties chaudes de son aire; il est de plus 

 en plus clairseme vers le N. et ne depasse guere en France la 

 region de l'Olivier; toutefois on a constate sa presence ä Grenoble. 

 Le T. angustifolia L. var. Saulseana Le Grand, decouvert äNyons 

 (Dröme), doit etre rattachö auT. angustata\ le T. australis Schum. 

 et Thonn. n'en est probablement qu'une variet^. J. Offner. 



