Dtpterocarpus?[ Diptcrocai'pacecB. 113 



Fruit- Sep. much enlarged, but without a 

 thickened base or distinct wings, erect or 

 spreading. 

 Sep. unequally enlarged, wing-like, erect . 5. Sunaptea. 



Sep. equally enlarged, spreading. 

 Sep. loosely or not at all imbricate . . 6. Vatica. 

 Sep. strongly imbricate . . . .7. Balanocarpus. 



Fruit-sep. slightly and equally enlarged, reflexed. 



Stam. indefinite 8. Vateria. 



Stam. 15; ov. 3-celled 9. Stemonoporus. 



Stam. 5 ; ov. 2-celled 10. Monoporandra. 



The limits of the genera in this Order are very uncertain, and the 

 present arrangement will be found to differ in some respects from that 

 given in Fl. B. Ind. Dr. Burck, of Java, has recently {Ann.Jard. Buiten- 

 sorg, vi. 145) proposed new limitations, based on the anatomical relations 

 of the secretory channels in the internodes and petioles ; but, whether these 

 be truly natural or not, they are not available for use in the field, and I 

 have here kept to the more easily recognised characters afforded by the 

 fruiting calyx and stamens and the structure of the seed. 



The Family is confined to the Eastern Tropics, and is especially 

 characteristic of the Malayan flora. All our species are endemic, except 

 Vatica Roxburghiana. Very few species occur in Peninsular India. 



Our knowledge of the Ceylon species is imperfect. They are for 

 the most part tall trees, very local and inhabiting dense wet forests ; 

 many appear to flower only at long intervals ; and fruit, upon which the 

 nomenclature so much depends, is difficult to obtain. It is probable 

 that there are several more species than those here described, but leaves 

 alone afford no characters for determining even their genera ; the native 

 names, too, are often very vaguely applied, and give little help. 



Of our forty-six species all are confined to the moist region, with the 

 exception of Vatica obsciira^ which is found only in the dry country, and 

 Stemonoporus acuminatus, Hopea (?) cordi/o/ia, and Balanocarpus 

 zeylanicus^ which inhabit what may be called the intermediate region. 

 Only about six species reach up into the lower montane zone, of which 

 Doona Gardneri, Stemonoporus Gardneri, and S. affinis, extend the 

 highest. 



In the descriptions of the leaves the number of lat. veins given is that 

 on each side of the midrib. On young shoots the leaves are often of 

 considerably larger dimensions than those here given. 



I. DZPTEROCARFUS, Gaertn. f. 



Large trees ; 1. with very large membranous deciduous 

 stip. ; fl. large, in axillary racemes or spikes ; sep. 5, com- 

 bined into a lobed cal., 2 (rarely 3) lobes much longer than 

 others, greatly enlarged in fruit ; pet. 5, usually connate at 

 base ; stam. indef., anth. linear, long-acuminate ; ov. 3- 

 celled ; fruit indehiscent, enclosed in but not adherent to 

 the tube of the enlarged persistent cal., of which two of the 

 lobes have become long wings ; pericarp thin ; seed large ; 



I 



