334 



ZONES AND REGIONS 



[Pt. Ill, Sect. I 



Stahl, who has closely studied pendent leaves and pendent shoots, 

 mentions the occurrence of pendent leaves in Monstera deliciosa, Mangi- 

 fera indica, Theobroma Cacao, Durio zibethinus, Ouercus glaberrima, Acer 

 laurifolium, in fact in trees of very diverse affinities. On the other hand, 

 to both Stahl and myself pendent twigs are known in connexion with the 

 Caesalpiniaceae alone — in Amherstia nobilis, species of Brownea, Jonesia, 

 Maniltoa, Humboldtia, Cynometra. 



Fig. 176. Amherstia nobilis. Twig with pendent young lateral twigs. Botanic garden 

 at Buitenzorg. From a photograph by Treub. 



Pendent leaves and pendent twigs by no means occur in the majority of 

 woody plants of the virgin forest, but only in a minority of species, to which 

 however a number of economic and ornamental trees belong, so that the 

 phenomenon is generally striking. 



In many cases the mode of development of shoots does not differ 

 essentially from that of woody plants of temperate zones. But the pro- 

 tection of young members is possibly more frequently observable than in 

 temperate zones, whether it consists of a rich coating of hairs, a vertical lie 

 of the leaves, or of their production under cover of the older foliage. Many 



