( 762 ) 



Botany. — '' Contrihutiov A'". 1 to the km:nnh'(J(je of the Flora of 

 Java." By Dr. S. 11. Koordeks. (Continuation^)). 



(Communicated in the meeting of March 28, 1908). 



§ 3. On the geographical distribution, oecological conditions and means 

 of dissemination of the Acoraceae, growing wild in the highest mountain 

 regions of Java. 



§§ 1 . S y n n y in s and g e o g r a \) li i t' a 1 d i s t r i I) n t i o n . 



This order, wliicli in Bentham and Hooker's (Tenera Plantarum 

 and in Boerlage Hand leid. Flora N. \. ïovms i^ixrt of the Sap i7ulaceae, 

 consists of two genera; oidy one of these [Ace/-, Linn.) occurs wild 

 in Java. Of the genus Acer about ÖO species are known ; only one 

 of these {Acer nivenm Be.) belongs to the tlora of Java, and has 

 frequently been found tliei'e, growing wild in the higher mountain 

 regions (u|) to 2550 in. above sealevel). 



Some authors, e. g. Pax 1. c, distinguish two varieties in Java, 

 which were regarded by Bia'me as species Acer niveum Bl. <jenuinum 

 Pax and A. nlreuni var. casslaefoUa (Bl.) Pax. According to Pax I.e. 

 the former of these has broad elliptical or ovate leaves with rounded 

 base and a snowy white under surface, the latter oblong leaves with 

 an acute base and a blue-grey under surface. The type is represented 

 at Buitenzorg in Herb. Kds. by specimens from the G. Gedé (Herb. 

 Kds. 12645 S) and the variety by specimens from Tak('»ka (Herb. 

 Kds. 7251 ,?). By far the greater number of specimens (e.g. many 

 from tlie Gedé), however belong to neither of these t w^ o 

 forms, as they combine various properties in a number 

 of ways. We therefore consider tlie two varieties to be merely the 

 extreme forms of one and tlie same, more or less varying ") type. 

 Some specimens in Plerb. Kds., should further be noted, in which 

 the under surface of tlie leaf (in the dried state) appears to be green, 

 e.g. Kds. 7265 /? from the G. Slamat ; by this character and also by 

 the incipient serration of the leaf margin, these specimens approach 

 to .1. Iaeui;/ata Wall. Kds. 7267 i"? from Pringombo should also be 

 considered ; the leaves, wliicii, in the living state are pale blue-grey 

 cannot be distinguished from those of A. oblongum. The colour of 



1) Continued from These Froc, Febr. 29tli 1908 p. 687. 



2) In his last monograph of the Aceraceae Pax I.e. (190:2) 8 J also, however, 

 already says, that the variety cassiae folium (Bl.) Pax, which lie formerly separated 

 olf, scarcely differs from the type. 



