474 WRIGHT : FOLIAR PERIODICITY 
colorata, Bombax malabaricum, Erythrina indica, Gmelina 
arborea, Gyrocarpus Jacqaini, Chickrassia tabularis, and 
Spondias mangifera the flowers are produced when the tree 
is perfectly leafless and the production of flowers does not 
usually occur after the tree is in full leaf. 
In other four species the flowers always appear with the 
young leaves as in Dalbergia frondosa, Stereospermum 
chelonioides, Vitex Leucoxylon, and Sterculia fcetida. 
In other three species the production of flowers is delayed 
until all the leaves have been produced. In Melia dubia 
the flowers appear soon after the new leaves, but in the case 
of the other two species, Bridelia retusa and Lagerstrœmia 
Flos-reginæ, a considerable time may elapse between the 
full leaf and flowering periods. Most of the deciduous 
species in which the relationship of these periodicities has 
not been observed probably belong to this group. 
Other species show a mingling of the two periodicities 
in various ways. For instance, some trees of Albizzia 
stipulata and Schleichera trijuga produce their flowers with 
the new leaves and continue to do so when the tree is in full 
leaf. Others such as Pongamia glabra, Phyllanthus Emblica, 
and Chloroxylon Swietenia commence to produce flowers 
when the trees are leafless and continue to do so until the 
new leaves are developed. In the case of Eriodendron 
anfractuosum, there is a copious production of flowers when 
the tree is leafless and flower production continues through 
the young leaf stage until the tree is in full leaf. 
At Peradeniya the majority of plants whether arborescent, 
shrubby, or herbaceous seem to produce large numbers of 
flowers during the dry hot periods, though this is by no means 
the case with every species in the district. 
The foliar, floral, and fruit periodicities of Bombax mala¬ 
baricum are of more than usual interest. They show 
a division of labour or succession of periodicities 
which is only rarely observable in tropical plants. In the 
Peradeniya district old trees first allow their leaves to 
become discoloured and fall in December, and, after the 
