IN CEYLON. 
147 
The polygamous condition is rnnch more common, and in 
some districts I have often experienced difficulty in finding 
a true male tree. When at Vavuniya with Mr. H. P. C. 
Armitage in April, 1902, every tree examined in the neigh¬ 
bouring village compounds possessed male and hermaphro¬ 
dite flowers, and the extent to which polygamy existed 
reminded one of D. Gardneri, D. sylvatica, and D. affinis. 
(See pi. XII., fig. 4.) 
The flower systems on the polygamous trees are dichasial 
cymes, and more often than not the median flower is herma¬ 
phrodite; sometimes the whole inflorescence consists of 
male flowers only. Hermaphrodite flowers are particularly 
abundant where there has been excessive production of 
flowers in a local area; perhaps this can be correlated, 
physiologically, with causes similar to those which determine 
the frequency as median or top flower of other cymes ; certain 
it is that female flowers occur in areas where vegetative or 
floral construction is at the maximum. 
Male inflorescence consists of a dichasial cyme of 3-15 
flowers (cf. D. Toposia), sessile or subsessile on lower part 
of young shoots in axil of caducous bract of foliage leaf; 
bracts small, caducous, tapering apex, green, 2 mm. long. 
(See pi. XIII., fig. 1.) 
Flowers .-^The buds are linear, tapering, 10 mm. long and 
2 mm. diameter. 
Calyx funnel-shaped, green, 4 mm. long; segments 4, 
accrescent, green, speckled with white, rounded apex, short, 
nearly glabrous ventrally, hairy on dorsal surface, margins 
ciliate. 
Corolla tubular, yellow, throat constricted, total length 
11 mm.; segments 4 (rarely 3), glabrous, narrow, thick, 
rounded apex, rotate, 6 mm. long. 
Stamens numerous, 20-30, usually 16, arranged in 8 
epipetalous connate groups of 2’s or 3’s disposed opposite and 
alternate to corolla segments; one group of 4 consisted 
of a yellow pedicel 1 mm. long bearing 2 lateral sessile 
fertile anthers each 2 mm. long, immediately above this 
