In1968 a Dutch-Philippine botanical expedition to central Luzon visited Mt. Pulog and Mt. Tabayoc, the latter hitherto unknown to biologists. Most work was done above 2200 m. In this paper, conditions are reported, and descriptions given of the open grasslands on both mountains, together with an explanation of their origin, with emphasis on the role of Arundinaria niitakayamensis (Graminae) in both the destruction by fire and the regeneration of the virgin 'mossy' forest. The great extension of Pinus insularis-forests, attributed to fire and therefore to human influence, is also expounded. , A small lake on Mt. Pulog and four small lakes on Mt. Tabayoc are for the first time briefly described. Many collected plants have been cited with name and number; most remarkable are Potentilla papuana (Rosaceae) and Blyxa cf. novoguineensis (Hydrocharitaceae), both only known from New Guinea and now new for the Philippines. Also new (for Malesia) is Oxalis acetosella ssp. griffithi (Oxalidaceae), of northern affinity. Smilax pygmaea (Liliaceae) is reduced to S. china. , In view of the rapid disappearance of the rich virgin forest in Luzon at higher elevations, of great importance as a source for future reforestation and for water and soil conservation, a proposal is made to proclaim the area on Mt. Pulog, Mt. Panotoan, and Mt. Tabayoc above 2200 m a National Park.