49 



9. Scaevola Koenigii Valil. 



At present named Sc. frutescens Krause. This is a shrub which 

 in the Dutch East Indies is very common on sandy beaches lying 

 either on coral or on another subsoil. The fruits ') possess a fleshy 

 pericarp that soon becomes dry, and a ribbed endocarp developed 

 into a floating tissue; they are frequently found washed ashore 2 ). 

 The beaches of Krakatao are very fit for this species, which was 

 found there at every excursion. 



As far as the identity of the plants found by F r e u b on the 

 shore is well-established, they all belong to species which are 

 frequent on the beaches of the Dutch East Indies, with the sole 

 exception of Pennisetum macrostachyum, an inhabitant of sunny sterile 

 localities, such as the rocky slopes, bare or covered with ashes or 

 pumice, which lie near the part of the beach investigated by Treub. 

 This beach did not exist before the eruption. As we may certainly 

 assume that by the eruption of 1883 the original littoral vegetation 

 of Krakatao was entirely destroyed, it is very probable that all the 

 true littoral plants found by Treub were introduced from elsewhere. 



For the interior, ,,la montagne proprement dite", Treub ment- 

 ions the following species : 



PHANEROGAMS. 

 1. Wollastonia spec. 



Wollastonia, at present reduced as a section to the genus 

 Wedelia, is represented in the Dutch East Indies by a small number 

 of species of which only one, Wedelia biflora D. C. (Wollastonia 

 glabrata D. C.\ has been found until now on Krakatao. To this 

 species belong also, as appears from materials preserved in the 

 Buitenzorg Herbarium, the plants mentioned for Krakatao in the list 

 of P e n z i g :! ) under the names Wedelia asperrima fiocr/. and 

 Wedelia scabriuscula Boer/. Hence it is probable that the plant 

 recorded by Treub as Wollastonia, was also Wedelia biflora. 



Wedelia biflora is a very common halophyte on the Indian beaches 

 and the level or almost level localities /f ) immediately or at some 

 small distance behind these. Often also it is found along the mouths 



M Described by S c h i m p e r. Indo-Malayisclie Strandflora (1891 ). p. I Til, tali VII, 

 fig. 25, under the name of Sc. Koenigii. 



2 ) Guppy found them in the drift-zone on the Keeling Islands- 



") Ann. |ard. Bot. Buitenzorq XVIII (1902) 105. 



. 4 ) Cf. |. M assart, Un Botaniste en Malaisie (1895), p. '290 (142) (under the name 

 of Wollastonia glabrata D.C.); p. 29i (146) (under the name of WoHaslenia). 



