68 Robinson : Alabastra philippinensia 



Mitrephora Williamsii sp. nov. 



Flowers fragrant, striped red and yellow, fascicled in condensed 

 cymes, opposite the leaves, apparently unisexual, only male flowers 

 seen : pedicels 5-8 mm. long, 2 mm. in diameter, covered with 

 brownish tomentum, as are also the outer sides of the sepals and 

 the outer row of petals : sepals 3, separated nearly to the base, 

 broadly ovate, shortly and obtusely acuminate, 5-6 mm. long, 

 4 mm. wide at the base : petals of outer row 3, valvate in bud, 

 similar in shape to the sepals but much larger, being 1.3- 1.5 cm. 

 long, 9-10 mm. wide at the base ; inner petals 3, very dissimilar 

 to the outer in shape, consisting of a claw i cm. long and 2 mm. 

 wide, its width nearly constant throughout, bearing a rhomboid- 

 orbicular hood 6-7 mm. long and 7.5 mm. wide, the inner surface 

 of the hood ferruginous-tomentose and forming about 7 longi- 

 tudinal folds: stamens numerous, 200-250, 0.8-1 mm. in length, 

 the anther-cells covered at the apex by the connective. 



A small tree 12 m. high, having a trunk 12.5 cm. in diameter: 

 bark of ultimate branches dark-gray or black, longitudinally 

 striate, the younger portions somewhat ferruginous-tomentose, 

 becoming glabrate : leaves borne on stout petioles 12-18 mm. 

 long, and 2.5-4 mm. thick, ovate, acute at the base, gradually 

 narrowed above to an obtuse apex or barely acuminate, 20-32 cm. 

 long, 7-1 1.5 cm. wide, the upper surface somewhat olive-green, 

 glabrous, shining, the under surface brownish-green, slightly fer- 

 ruginous-pubescent on the midrib and primary veins ; midrib and 

 primary veins immersed above, conspicuous beneath, primary 

 veins 20-25 on each side of midrib. 



Type collected at Sax River, Province of Zamboanga, Min- 

 danao, by R. S. Williams, no. 2188, in flower, March 3, 1905. 



Polyalthia clusiflora (Merr.) 



Unona clusiflora Merr. Bur. Govt. Lab. Publ. 35 : 13. 1905. 



Examination of several collections of this species showing that 

 the carpels each contain a single ovule, attached at the very base 

 of the carpel, it is necessary to transfer it to the section Monoon 

 of Polyalthia. 



Widely distributed in the Philippines, being known from Luzon, 

 Leyte, and Mindanao. 



Uvaria rubra sp. nov. 

 Flowers hermaphrodite, solitary on leaf-bearing branches, but 

 not opposed by leaves: pedicels and calyx ferruginous-tomentose; 



