STEMS 71 
86. Annual, Biennial, and Perennial Plants. — Annual 
plants are those which live but one year, biennials those 
which live two years 
or nearly so. 
Some annual plants 
may be made to live 
over winter, flower- 
ing in their second “7 
summer. This is true fF” 
of winter wheat and mre. 36.—A Portion of 
(Natural size.) 
plants. 
Perennial plants live for a series of 
years. “Many kinds of trees last for 
centuries. The Californian giant redwoods, or Sequoias 
(Fig. 32), which reach a height of over 300 feet under 
favorable circumstances, live nearly 2000 years ; and some 
Fie. 37. —Twigs and 
Branches of the 
Birch. 
V4 4 : 
monstrous cypress trees found in Mexico were thought by 
Professor Asa Gray to be from 4000 to 5000 years old. 
