KEY TO THE GENERA OF TREES 61 



OO. Leaves about 2 in. long and gradually widening from the 

 acute tips to the broad (% in.) bases, which are deeurrent 



on the stem 99. Qunninghamia. 



OO. Leaves }-l in. long, sharp-pointed, very flat, two-ranked, 

 somewhat lanceolate in form ; base narrowed almost to a 



petiole 102. Sequoia. 



PP. Leaves not deeurrent, usually in whorls of three around the 

 stem, sometimes opposite, acute-pointed; fruit small ( l /z in.), 



rounded, dark-colored berries 106. Juniperus. 



PP. Leaves deeurrent on the stem, less than y z in. long. (0,0,.) 



0,0,. Fruit small, globular cones ; the scales not lapping 



104. Chamsecyparis. 



0,0,. Fruit small, elongated cones of few, lapping scales 



.103. Tlmya. 



RR. Leaves usually but little flattened, but jointed to a short, 

 brown petiole which is attached to a somewhat grooved 



twig ; cones pendent, of lapping scales 94. Ficea. 



B-R. Leaves decidedly flattened, not jointed, but narrowed to a 



petiole which is usually green or greenish in color. (SS.) 

 SS. Leaves rounded or obtuse at the tip, .distinctly two-ranked, 

 usually less than 1 in. long; cones oval, 1 in. or less long, 



of lapping scales 95. Tsuga. 



SS. Leaves acute at the tip ; fruit (found only on a portion of 

 the plants, as the flowers are dioecious) drupe-like, with a 

 single nut-like seed. (TT. ) 



TT. Leaves not two-ranked, over 2 in. long 108. Podocarpus. 



TT. Leaves quite regularly two-ranked. (UTT.) 

 UU. Leaves marked by two longitudinal lines; bruised or 



burned leaves with a very disagreeable odor 



(107. Torreya.) 



UU. Leaves with the midrib forming a distinct ridge, odor not 

 disagreeable. (VV.) 



W. Leaves usually less than an inch long 107. Taxus. 



VV. Leaves usually more than an inch long 



(107i>. CepJialotaxus.) 



WW. Spray decidedly two-ranked, fan-like. (YY.) 

 WW. Spray branching in an irregular way, not two-ranked. 

 (XX.) 



XX. Fruit a purplish berry; bark shreddy 106. Juniperus. 



XX. Fruit a cone of thick, pointed, not lapping scales 



102. Sequoia. 



YY. Cones elongated, of lapping scales 103. Thuya. 



YY. Cones globular, of peltate, valvate scales 



104. Chamsecyparis. 



