232 



DlLLEXLACEAE. 



AOTINIDIA. 



(Family Dilleniaceae). 



Woody twiners: deciduous. 

 Stems moderate, terete, brown: 

 pith moderate, white and con- 

 tinuous in some species, pale 

 brownish and chambered in others, 

 terete. Buds small, concealed in 

 the thickened cortex above the 

 leaf-scar, the end-bud lacking. 

 Leaf-scars alternate, round, rather 

 large, much raised: bundle-trace 

 1, round or crescent-shaped: 

 stipule-scars lacking. 



The curious anomaly of buds 

 buried in the cortex, which Actini- 

 dia shows, does not rest upon ad- 

 ventitious development from the 

 vascular axis of the stem, as ap- 

 pears to be the case. In a paper 

 published in volume 3 of the 

 Botanisches Centralblatt, Hilde- 

 brand shows that in their earlier 

 stages these buds are at the surface, as in ordinary plants, 

 but as the development of the node progresses the large cor- 

 tical cushion about them thickens so as to surround and 

 finally overtop them. 



Winter-character references: A. arguta. Shirasawa, 259, 

 pi. 7. A. polygama. Schneider, f. 93; Shirasawa, 259, pi. 7. 



1. Pith white, continuous. (Cat vine). A. polygama. 

 Pith brownish, chambered. 2. 



2. Twigs glabrous. (1). A. arguta. 

 Twigs hairy. A. chinensis. 



