NOTES ON DIPTEROCARPS. 



1C7 



Fig. 17 



Figs- 14, 15, 16, 17. Abnormal seedlings of Shores maoroptera. 



The period from floAvering to seed fall in the Shoreas, all 

 except 8. bracteolata being wild in the Botanic gardens, is about 

 ten weeks in the case of 8. leprosula, 8. rigida, 8. macroptem and 

 S. pauciflora } about nine weeks in the case of 8. bracteolata and 

 8. gibbosa. 



8. gratissimot, Dyer, which in addition to those just named 

 also occurs wild in the Botanic gardens, flowered in 1915 in three 

 trees, at some little distance from each other, one being in area 

 N. (No. 1239) the second in area U (No. 1237), and the third in 

 area V (No. 1238) ; and it did not flower along with all the other 

 species in 1916. But apparently it has flowered on earlier occa- 

 sions at the same time as other species, and probably the conditions 

 which lead to the flowering of all are very similar. One tree of 

 8. leprosula which had not flowered in 1916, a young tree, flowered 

 in 1917: clearing had been done round it in 1916 and it had 

 received some injury during the work. There was consequently in 

 its case a change of conditions which might account for the flower- 

 ing. In the case of all the species, such records as exist in the 

 Singapore herbarium suggest that flowering occurs in the first 

 suitable season after three years have elapsed from the last heavy 

 seed-crop. 



In India 8. robusta flowers in almost every year, but on the 

 average one year in three only is a year of good seed. 



R. A. Sac, No, 76. 1917. 



