NOTES OX DIPTEEOCAKPS. 



75 



Figures 202 and 203, seedlings of Shorea bracteolata in which the cotyledons 

 had been packed twisted into the shape of an S. 



->•- 204- 



Figure 204, inflorescence of Shorea leirosula to show the horizontal aspect 

 of the flower, nat. size ; figure 205, a branchlet slightly enlarged. 



All the Skoreas kere described except S. bracteolata develop 

 red pigment in tkeir seedlings. S. macro ptera and 8. Curtisii 

 possess it also in the leaves which follow while they are quite young. 



Pachynocarpus. 



In many points the genus P achy no car pus is unlike the other 

 Dipterocarps here under discussion, and in none more so than that 

 the fruits appear fitted for distribution by water. They, in Paclvy- 

 nocarpus Wallichii, are nearly globose, and the calyx is no larger 

 than it was in the flower. The flower is drawn in figures 204: and 

 205 and the fruit just germinating in figure 206. Thirty-four fruits 

 of the species were collected in the Botanic Garden, Singapore, in 

 November, 1918 and kept in water with the intention of ascertain- 

 ing how long they would float. The first to sink had floated only 

 five days, the second ten days, but the rest floated various periods 

 from ten to forty-six days ; and the average of the thirty-four was 

 twenty-two days. They germinated as they sank, the stalks of 



R. A. Soc. No. 81, 1920. 



