CULTIVATED ORNAMENTAL SHRUBS. 137 
tection against continued rains and spells of extreme cold. The fra- 
grant pittosporum (Pittosporum tobira), jessamines, cape jessamine 
(Gardenia) are perfectly hardy. Thecentury plant (Agave americana) 
not infrequently puts forth its candelabra-like flowering shafts, and 
yuccas ( Yucca treculeana, etc.) from Mexico and the adjacent Texan 
region, and the tropical so-called sago palm (Cycas revoluta) and 
arrowroot palm (Zamia integrifolia) of southern Florida add to the 
number of decorative evergreen plants. 
