FLOBA OF THE PHILIPPINE ISLANDS. 301 



Boliol lies south of Leyte, near to Mindanao, and is about as 

 large as Leyte. Of plants collected here by Cuming, Eyssopteris 

 microstemma, A. Juss., Guettar delta philippinensis, Benth., Melo- 

 dinus Cumingii, A. DC, AUschynanthus philippinensis, Clarke, 

 Eria vvlpina, Eeichb. f., E. retrqflexa, Lindl., Arundina speciosa, 

 Lindl., Calanthe conspicua, Lindl., and Cypripedium Argus, Eeichb. 

 f., are not known from elsewhere. Cebu is a long narrow island 

 north-west of Bohol, and slightly smaller. Cuming also collected 

 here, and of his plants Kayea philippinensis, Planch , Et/sso- 

 pteris dealbata, A. Juss., Carruthersia pilosa, F. Villar, and Carex 

 Jibrata, Boott, are not yet found elsewhere. Negros is sepa- 

 rated from Cebu — which lies almost parallel to it — by the Tanon 

 Straits ; it is about as large as Samar, and contains a volcanic 

 mountain 7500 feet high. Cuming visited the island, and of the 

 plants obtained by him Carex Cumingiana, Steud., and Voacanga 

 Cumingiana appear to be endemic. Panay lies north-west of 

 Negros, and about equals it in size. Cuming collected some 

 plants here ; a few r also occur in Vidal's collection. Of these 

 TJtricularia rosulata, Benj., is not known from elsewhere. 



The island of Luzon has been considerably explored, though 

 some parts of it are very little known, especially the Pacific side 

 of the northern half of the island ; but sufficient data have 

 been collected for a brief outline of its physical conditions and 

 vegetation. Commencing at the southernmost point, we find 

 Bulusan, the most active volcano in the island, reaching to 5000 

 feet; a little further north is Sorsogon : then comes May on, a 

 less active volcano, barren at the summit, and reaching to over 

 7000 feet above sea-level. Still going northward we come to 

 Iriga, reaching 5000-G000 feet, and clothed almost to the summit 

 with vegetation ; and then to the quiescent volcano of Isarog, 

 6000 feet high. Just to the north of this is a depression running 

 right across the island, and consisting entirely of raised coral- 

 reefs. Before the period of elevation set in, this formed a sepa- 

 rate island. North-east of this is Labo, nearly 5000 feet high ; 

 and a little further on in the same direction a bay may be seen 

 on either coast, the intervening area consisting of raised coral- 

 reefs. This also marks the limit of a former separate island, of 

 which the previously mentioned reef formed the southern limit. 

 This district, reaching to the southern point of Luzon, is the pro- 

 vince of South Camarines. Some of the endemic specie of the 



