DIFFERENT SPECIES OF PALMS. 543 



the Havana, from a smooth, slender, and grass-green shaft, placed like an additional 

 column upon the dark-colored trunk. In the fan-palms, the crown frequently rests 

 upon a layer of dried leaves, which impart a severe character to the tree. 



The form of the trunk also varies greatly, sometimes almost entirely disappearing, as 

 in GhamcBrops humilis ; sometimes, as in the Calami, assuming a bush rope appear- 

 ance, smooth or rugged, unarmed or bristling with spines. In the American Yriarteas, 



