XVlll TABLE OF GENERA 



Gen. LiBOCEDRUS, Endlicher. Leaves, scale-formed, in oppo- 

 site pairs, and imbricated, in four rows, the upper 

 and imder ones being much the smallest. 



Flotvers, male and female on the same plant, but 

 separate. 



Co7ies, oval, more or less obtuse, leathery, and 

 composed of from four to six scales, which are but 

 slightly concave on the inner face, and with the 

 lower ones much the smallest. 



Seeds, singly or in twos under each scale, and 

 unequally two-winged. 

 Gen. Thitja, Linnaus. Leaves, in opposite pairs, compressed, 

 very small, scale-formed, imbricated, and mostly 

 unequal in size. 



Floicers, male and female on the same plant, but 

 separate. 



Cones, ovate-oblong, terminal, leathery, with 

 from four to six scales, in opposite pairs, and un- 

 equally sized. 



Seeds, in twos at the base of each scale, and 

 furnished with a transparent wing. 

 Gen. Biota, Don. Leaves, scale.like, very small, in opposite 

 pairs, flattened, and imbricated in four rows. 



Flowers, male and female on the same plant, but 

 separate. 



Cones, roundish, squarrose, leathery, and com- 

 posed of from six to eight valves or scales, in op- 

 posite pairs, peltated on the top. 



Seeds, in twos under each scale, crustaceous, and 

 wingless. 

 Gen. AcTiNOSTROBUS, Miqitel. Leaves, in whorls of three, 

 very small, scale-formed, persistent, and very acute- 

 pointed. 



Flowers, male and female on the same plant, but 

 separate. 



Cones, globular, woody, and composed of six 

 scales, disposed in two vertical sets at the base. 



Seeds, in twos under each of the upper scales, 

 three-edged, and winged on each side. 



