148 



22. Desmodium umbellatum D. C. 



Erect shrub, spread from West- till East-Java, especially 

 on sandy beaches, exceptionally on river-sides. The reproduc- 

 tion is effected by the small articulate pods, which, when 

 ripe, break into fragments which possess floating power 

 because of their rind being thick and light. 



A few specimens on the younger parts of the beach. 



23. Derris heterophyl/a Backer (D. uliginosa Bth.). See p. 134, No. 21 . 



A few specimens on the younger parts of the beach. 



24. Erythrina variegate L. var. orienta/is Merr. (E. indica Lmk.). 



See p. 46 sub No. 1. 



A few young specimens on the younger parts of the beach. 



25. Canavalia rosea D. C. (In Ernst's paper named C. obtusifolia 



D. C.) See P . 92, No. 8. 



Numerous on the younger parts of the beach. 



26. Vigna marina Merr, (V. lutea D. C. and V. luteola D. C.). 



See pp. 89 and 93. 



Numerous, especially on the younger parts of the beach. 



Euphorbiaceae. 



27. Euphorbia atoto Forst. See p. 90 and p. 93, No. 10. 

 Several specimens on the younger parts of the beach. 



Sapindaceae. 



28. DoJonaea viscosa Jacq. 



Erect shrub or small tree, the reproduction of which is 

 effected exclusively by seeds. When ripe, the 2 3-winged 

 2 3-locular capsules either fall off as a whole or burst 

 open. Each cell contains 1 2 seeds which are provided 

 with a black, moderately thick testa and remain for some 

 time attached to the placenta after the valves have fallen 

 off. The distribution takes place either over land by the 

 wind which drives the fruits over the sands ') or by water 

 on which the fruits and the seeds can float. From an 

 experiment carried out by S c h i m p e r 2 ) it appeared that 

 the seeds can remain floating for 10 60 days on a 



! ) As Sc him per [Indo-Malayische Strandflora (1891), p. 157] already observed 

 they are far too big to be carried by the wind through the air across a broad sea. 

 a ) Sc him per, Indo-Malayische Strandflora (1891), p. 165. 



