42 



THE VOYAGE OF H.M.S. CHALLENGED 



peculiarities; Platydesma, Rutaceaj ; Hesperomannia, the only Composite of the sub- 

 order Mutisiacese known from the Pacific Islands ; Rollandia, Delissea, Clermontia, and 

 Brighamia, shrubby and subarboreous Lobeliacese ; and Phyllostegia and Stenogyne, 

 herbaceous Labiataj. 



The principal endemic peculiarities of the Seychelles, and other islands in the tropical 

 parts of the Indian Ocean, have been pointed out on p. 11 ; but there are two or three 

 other remarkable genera deserving of mention, namely, Roussea, an anomalous genus of 

 Saxifragece, inhabiting Mauritius and Bourbon ; the Rodriguez endemic Mathurina, an 

 arboreous member of the Turneracea), which is described as being most nearly related to 

 Erblichia, a monotypic genus native of Panama ; and Dendrosicyos, an arboreous Cucur- 

 bitacea, known only from the island of Socotra. 



DISPERSAL OF PLANTS BY OCEANIC CURRENTS AND BIRDS. 



In Part III., pp. 277-313, we have brought together all the evidence we have been able 

 to find on the dispersal of plants by oceanic currents and birds, and we have little to add 

 here ; but we have drawn up lists of plants which are certainly or probably transported 

 by these agencies. The first, which consists of plants probably dispersed by oceanic 

 currents, is partly derived from the collections of drifted and stranded seeds which we have 

 examined, and partly from other sources ; a certain number of widely dispersed littoral 

 plants having been added on the assumption that their present distribution could be 

 accounted for in no other way, and farther observation will doubtless greatly augment this 

 list. Among the drift-seeds were many which probably rarely if ever survive long 

 immersion in the sea, and these are not included. 



PLANTS CERTAINLY OR PROBABLY DISPERSED BY OCEANIC CURRENTS. 



Menispermaceje. 

 Cissampelos pareira. 



Crucifeiu;. 

 Lepidium pisddium ? 



IIlXIXE/E. 



Pangium edule. 



PoRTUIiACEa. 



Portulaca oleracea. 



Guttifer.e. 

 Ccdophyllum inophyllum. 



,, calaba. 



Malvaii: r. 

 Hibiscus tiliaceus. 

 Hibiscus sp. 

 Thespesia populnea. 



Stekuuliace.k. 

 Sterndia. 

 Heritiera lit /oral is. 



Tiliace^:. 

 Triumfetta ? 



SlMARUBE.E. 



Suriana maritima. 



Ochnace^;. 



Brackenridgea. 



Meliace^e. 

 Carapa moluccensis. 

 „ guyauensis. 



Olacine-e. 

 Gomphandra. 



