134 Materials for a Flora of the Malayan Peninsula. 



the reticulations and 6 pairs of nerves bold and prominent ; length 4 to 

 5 in., breadth 1'25 to 175 in. ; petiole "2 to '3 in. Panicles axillary and 

 terminal, slender, spreading. Flowers '25 in. in diam. ; shortly pedicellate- 

 Sepals 5, pubescent, slightly unequal. Ovary hairy. Samaras 2 in. 

 long; the nucleus 1 in. to 1'25 long, triangular, flat; the wing thinly 

 membranous, pale yellow, oblong, its apex blunt, oblique, venation 

 vertical, the areolae wide. Isopteris penangiana, Wall. Cat. 7261. 



Penang, Malacca. Perak ; common. 



The pubescence on the under surfaces of the leaves is so minute 

 that, without a good lens, it is not seen. 



5. Xanthophyllum, Roxb. 



Trees or shrubs. Leaves coriaceous or sub-coriaceous, usually yellow- 

 ish green. Sepals 5, nearly equal. Petals 5 or 4 ; the inferior keeled, 

 not crested. Stamens 8, distinct, 2 attached to the base of petals, the 

 others hypogynous. Ovary often surrounded by a hypogynous disc, 

 stipitate, 1-celled ; style more or less filiform, ovules various in insertion 

 and number. Fruit 1-celled, 1 -seeded, indehiscent. Seeds exalbumi- 

 nous, estrophiolate. Uistrib. Species about 27, mostly Malayan, a few 

 Indian and one in Queensland. 

 Ovules 4, 



Leaves membranous or sub-coriaceons (coriace- 

 ous in No. 2) small ; flowers less than "4 in. 

 long 



Fruit not verrucose. 



Ovary glabrous, fruit shining ... 1. X. Andamanicum. 



Ovary tomentose 



Nerves of leaves 3 to 4, young 



fruit tomentose ... ... 2. X. Griffi,thii. 



Nerves of leaves 4 to 5, fruit tomen- 



tose, branches very slender ... S. X. Maingayi. 

 Fruit verrucose. 



Fruit verrucose only when ripe, glab- 

 rous ; leaf-nerves 9 to 10 pairs ... 4. X. glaucum. 

 Fruit verrucose from its youngest state. 

 Nerves of leaves 4 to 5, ovary vil- 

 lous ; fruit glabrous, vertically 

 grooved ... ... 5. X.Palemhanictim. 



Nerves of leaves 4 to 5 ; ovary vil- 

 lous, fruit puberulous, not ver- 

 tically grooved ... ... 6. X.eurhynchum. 



74 



