242 THE VOYAGE OF H.M.S. CHALLENGER. 



and described by Seemann as a "distinct new species," which he named Cerbera forsteri, 

 we ao-ree with Nadeaud should rank as a variety of Cerbera oclollam. Jouan states that 

 this species is generally diffused in the Marquesas, though most frequent on the sides of 

 the hills. It is also found in the Seychelles, but does not apparently reach Africa itself. 

 There are three or four other species, which all inhabit maritime districts in the Old World. 



Tabernaemontana sp. 



Admiralty Islands. — There is a specimen of what is probably a species of this tropical 

 genus ; and among the seed-vessels picked up on the shore is one which has been identified 

 as that of Taherncemontana aurantiaca. 



Parsonsia spiralis, Wall. 



Parsonsia spiralis, Wall. ; Hook, f., El. Brit. Ind., iii. p. 650. 



Admiralty Islands. — Himalayas and China, to Ceylon and the South-eastern 

 Moluccas. 



ASCLEPIADE^. 

 Hoya sp. 



Admiralty Islands. — This is probably a new species, but it is so closely allied to 

 Hoya diptera, Seem., of which there are only two flowers at Kew, that we forbear naming 

 it, more especially as authenticated specimens of many of the Malayan species are not to 

 be seen in this country. 



BORAGINE.E. 

 Tournefortia argentea, Linn. f. 



Tounwfortia argentea, Linn. f. ; Seem., Fl. Vit., p. 170; Nadeaud, Emim. PI. Tahiti, p. 57. 



Admiralty Islands. — Generally diffused on tropical shores in the Old World, and 

 throughout Polynesia, except the Sandwich Islands. Cuming long ago collected it in 

 Ducie Island, and Arundel recently gathered it in the same island, and he notes on his label 

 that it is one of the commonest plants on the low islands in the South Pacific. See list of 

 plants on p. 116 collected by the latter gentleman. 



CONVOLVULACE.E. 

 Ipomcea biloba, Forsk. 



Ipomvua biloba, Forsk. ; Hook, f., Fl. Brit. Ind., iv. p. 212. 



Ipomoea pes-caprce, Sweet; Seem., Fl. Vit., p. 172; Nadeaud, Enuin. PL Tahiti, p. 5S; Jouan in 



Mem. Soc. Sci. Nat. Cherbourg, xi., 1865, pp. 116, 136, 148; Mann in Proc. Amer. Acad., vii. 



p. 195. 

 Ipomcea maritima, K. Br., Prodr. Fl. Nov. HolL, p. 486. 



Admiralty Islands. — Almost everywhere in maritime districts of tropical and sub- 

 tropical regions, including Polynesia, eastward to the Marquesas and Sandwich Islands. 



