24 ART. 19. — B. HAY ata: 



d) Tropical American Elements. 



These elements are very few in number, but among them 

 we have Oreopcinax, a genus of Araliaceœ. The occurrence of 

 this genus, which is all luit peculiar to the flora of Tropical 

 America, is exceptionally remarkable. It is perhaps the most 

 anomalous case we meet witli in the Formosan flora. This 

 genus is here represented by a large tree, Oreopanax formosana 

 Hayata. As far as I am aware, we have had no representative 

 of this American genus in any other region on the globe. The 

 tree is found in the mountainous districts on the north-western 

 side of the central ranges, and also on Mt. Morrison, l^otli 

 localities having elevations varying from (1,000 — 8,000 ft. As the 

 plots are quite inaccessible, it does not seem probable that the 

 tree was planted there by luiman agency. 



e) Malay Elements. 



These elements are rather less numerous. There are in all 

 08, or 25X of the whole number mentioned in the list. Among 

 them, w^e have 45 tropical elements or 12% of the whole 

 number. None of these species ascends to an altitude higher 

 than 3,000 ft. An exceptional case is that of the tropical genus, 

 Ilcpiapleurum, which is found at an elevation of about 7,000 ft. 



/) j^ortJi American Eleinents. 



These elements are comparatively well represented in this 

 flora. As has been seen in the foregoing list, we have as many 

 as 37 species, or S).h% of the whole number. Of these American 

 representatives, almost no species, except a very few cosmo- 

 politans, extends any farther south than Formosa, not even to 



