94 



floating power, but because of their great succulence soon 

 rot. The seeds contain a large air-chamber (compared by 

 Schimper 1 ) to an air-bladder), hence possess floating 

 power. 



Goodeniaceae. 



17. Scaevola frutescens Krause (Sc. Koenigii Vahl). See p. 49, No. 9. 



Compositae. 



78. WeJelio hif/ora D. C. (mentioned in Penzig's paper as 

 Wedelia asperrima Boerl. and W. scabriuscula Boerl.). See 

 p. 49, No. I. 



It is quite possible that besides these 18 species a number of 

 non-halophile ones were growing on the beach examined by Penzig, 

 especially on the older parts, which had become salt-free by leaching 

 and therefore, oecologically spoken, did no more belong to the beach 

 proper. Saccharum spontiineum L-, a halophobous species, has certainly 

 done so as appears from the legend under a photo -) reproduced by 

 Penzig on which this grass is distinctly recognizable. In 1906 and 

 1908 Saccharum spontaneum was in this locality one of the most 

 common 3 ) grasses on the oldest parts adjacent to the rupture. 

 Hereafter I shall revert to this grass. 



Consequently we may safely assume that Penzig on the beach 

 S. h. of Zwarte Hoek found at least 19 species and that 1 I of 

 these (No. 1, 2, 3, 4, 5, 8, 9, 10, 15 and 17 of the list above, 

 likewise Saccharum spontaneum A.) were quite common there. 



Treub had investigated in 1886 the same part of the beach 

 as Penzig and his companions did in 1897. This part being not 

 very large '') and causing no difficulties to the investigation, one is 

 perhaps warranted to believe that both investigations were sufficiently 

 accurate to admit a comparison of the results, though it should 

 never be forgotten that young plants may be easily overlooked or 

 not recognized and that in the same locality 5 botanists, as a rule, 

 will find more than one, especially if that one is no florist and the 

 5 others are assisted by a very able plant-collector r '). 



Of the 18 littoral or halophilous plants found in 1897 by Penzig 



') Indo-Malayisclie Strandflora (1*91), p. 105 tab. VII, fig. 20 b.c- 



';;) Ann. |ard. Bot. Buitenzorq XVIII (1902), p. 100. 



''') Cf. Ernst, Neue Flora Vulkaninsel Krakatao (1907 ) tab. IV, fig. "i , back-ground. 



4 ) According to the map in the ,,Handelinqen van het Congres" of which plate III 

 is a reduced simplified copy, it is about 750 rn. in length and at the broadest part 

 (in 1908) 150 m. wide. In 1897 it was probably narrower, in 1880 perhaps very narrow. 

 Neither Treub nor Penzig give data on this point. 



') 1 have not been able to ascertain whether Treub in 1880 was accompanied 

 by Pa I dan. 



