30 PINACEAE (PINE FAMILY) 



EQUISETUM 



Rootstocks perennial, branched. Stems regularly striated. 

 Branches, when present, in whorls from the nodes. (Equus, horse; 

 seta, bristle.) 



E. arvense, COMMON HORSETAIL. Stems annual, the 

 fertile ones brownish, usually unbranched, the sterile 

 ones green, prostrate or erect, branched, appearing after 

 the fertile ones. Common. 



TAXACEAE (YEW FAMILY) 



Trees or shrubs with evergreen linear leaves, and 

 dioecious flowers. The staminate flowers are glo- 

 bose. The pistillate ones consist of an erect ovule 

 which becomes a bony, coated seed, more or less 

 surrounded by a large fleshy disk. 



TAXUS 



Equisetum ar- T. canadensis, YEW, GROUND HEMLOCK. Disk of the 

 vense, Horse- pistillate flowers cup-shaped, becoming pulpy, red and 



tail. Fertile berry-like. Leaves flat, rigid, scattered, two-ranked, 

 and sterile ,. , , . , ,. , , 



shoots. linear, green on both sides. A low, straggling bush. 



PINACEAE (PINE FAMILY) 



Trees and shrubs. Awl-shaped or needle-shaped leaves. Monoe- 

 cious or dioecious, flowers borne in scaly catkins, the pistillate 

 ones becoming cones or berry-like. Ovules two or more at the 

 base of the scales. Nearly all evergreen. 



PINUS (PINE) 



Leaves 25 in each bundle, evergreen. The flowers develop in 

 the spring, the cones maturing the second autumn. 



P. Strobus, WHITE PINE. A handsome tall tree of dry or moist 

 woods. Leaves in fives, very slender, light green. Cones elongated, 

 long-stalked, cylindrical, nodding. A timber tree of the greatest im- 

 portance. 



