95 



and his companions, but 4 (No. 14, 15, 17 en 18) had been found 

 with certainty by Treub in 1886, the last-cited species, however, 

 in the interior only (See p. 49, No. I). If the two Cyperaceae found 

 by Treub on the beach were identical with those found by P e n z i g 

 (No. 4 and 5), the total in 1886 amounts to six. Finally Treub 

 found in that year 3 littoral plants (Calophyllum inophyllum L. Her- 

 nandia peltata Meissn. Tournefortia argentea L. fil., the last species, 

 however, being mentioned by him for the interior only) which were 

 not found back in 1897. Whether in consequence of unfavorable 

 circumstances (See pp. 44, 45) these littoral plants had disappeared in 

 the time elapsed between the two investigations or were overlooked 

 in 1897, nobody can tell; the two first were found back in 1906 in 

 the same locality, the third not. 



Considering that Treub took part in the expedition of Penzig 

 and surely has spoken to the latter on the differences between 

 his impressions in 1886 and 1897, taking moreover in account that at 

 both expeditions rare or inconspicuous plants may have been over- 

 looked, yet one gets convinced that (as might be expected from a 

 very young vegetation in a favorable locality) the flora of the level 

 beach S.E. of Zwarte Hoek in the 1 1 years between the two excursions 

 had grown richer, not only of species but especially of specimens. The 

 species found by Treub in 1886 were represented by few and young 

 specimens 1) which did not yet form a dense vegetation. Penzig 

 on the contrary expressly states -) of a number of species that in 

 1897 they occurred in numerous flowering and fruiting specimens 

 and densely overspread the beach. The Pes-caprae-formation, which 

 during the visit of Treub was just beginning to develop, had 11 

 years afterwards grown very much richer, but yet it was by no means 

 fully developed, for many members of that formation (and of the 

 /fo/T/ngton/cj-formation which gradually develops in it when there are 

 no disturbing influences as f. i. decrease of the beach, too great 

 mobility of the sand, destruction caused by man, cattle, fire) were 

 still 3 ) lacking or at least remained unobserved. Assuming that the 



') Ann. |ard. Bot- Buitenzorg I in Serie VII (1888), p. '217; ,,|'ai trouve sur la plage 

 ,,quelques jeunes pieds. " 



2 ) Ann. |ard. Bot. Buitenzorg XVIII (1902), p. 98: ,,Von den qenannten Arten sind 

 ,,schon sehr zahlreiche, den Strand z.1 . vollig bedeckende Exemplare vorhanden, welche 

 ,,reichlich bliihen und fmchten". 



3 ) In the same locality the following 12 ,,new" littoral plants were found in 1908: 

 Albizzia retusa Bth. Calophyllum inophyllum L Clerodendron inermc Gaertn. Derris 

 heterophylla (\Villdi Backer (D. uliginosa Bth). Desmodium umbcllatum D. C. 

 Doc/onaea v/srosa facq. Erythrina variegata L, var. orietltalis Mcrr, Pithecolobium 

 umbellatum Rth. Premna integrifolia L. SbpAora tomentosa L. Vitex paniculata 

 Lmk. Ximenia antericana L. 



