( 770 ) 



BiUiU'ii, £;ro\viii<i: on tlic (lat sandy hcacli. Tii Ihe Soiitlicrn Prcangci' 

 near Palaboelianralüc, also on the sandy Iteaeli. In (Central Java : 

 on the G. Frahoe at 2000 in. on tlie Pralioe-Diëng monntains along 

 the path from Soerdja to the Diëng- ])hiteau in the res. Tegal- 

 Pekalongan. Near vSepakoeng (res. Semarang) on the G. Tclemaja at 

 about 1700 in. and also in the res. Seniarang an the G. Merbaboeh 

 abo\'e Andongtjenioro at about 1600 ni. In the res. Kedoe on the 

 G. Sendara near Kledoeng at about 1()()0 ni. In the res. Madioen on 

 the G, Wilis above Ngèbèl at 1450 m. and higher up the mountain 

 to 2000 m. In the res. Pasoeroelian-Probolinggo on the G. Ardjoena 

 above Making at about 2100 m. and on the Tcnggcr mountains 

 above Tosari and Ngadisari still at 2600 m. above sea-level. In the 

 res. Besoeki on the Id jen plateau near the bivouae Oengoep-oengoep 

 at 1700 m. and on the Kcndeng ridge above Pantjoer at 1700 m. ; 

 also on the sandy beach of Gradjagan and on the sandy beach of 

 Poeg( r (on the South coast of the divisions Banjoewangi and Djember 

 respectively). Completely absent from the regions between the above 

 alpine stations and those in the beach. On the other hand where 

 this Dodonaea {D. vlscosa) appears, it generally either grows socially 

 forming smaller or larger woods, or it occurs at least in very large 

 numbers. — e c o 1 o g i c a 1 c o n d i t i o n s. It is completely 

 resti'icted (at least when growing wild) to physiologically dry loca- 

 lities, namely either to the dry alpine regions of Central and Eastern 

 Java above 1400 m. or on to the sea-beach, which is physiologically 

 dry in consequence of its richness in salts. On the beach this species 

 has been observed by me in W., as well as in Eastern Java. (Compare 

 also under "Means of dissemination", and further K. & V. 1. c. 229. 



§§4. Means of dissemination of 

 Dodonaea v i s c o s a. 



The inflated, thin-walled, light, winged fruits are not only eminently 

 ada])ted for wind distribution, but (as has already been mentioned 

 by some authors, and has been confirmed hy me experimentally), 

 they are also extremely well suited for transport by water. Of some 

 fruits, which I placed in a 3^ " „ solution of common salt, 80 Vo still 

 floated after 25 days. 



In Java the plant bears a large number of fruits at an early age, 

 e. g. before it is 2 years old. 



As 1 have observed in Central Java, this species occurs wild on 

 two volcanoes which are more than 40 kilometres apart, in a straight 

 line, and on these only above an altitude of 1400 m., whereas it 



