GENERAL KEY TO THE FAMILIES AND GENERA. 



Baserl on the tlower and other characters present at 

 the time of blooming. The number following the generic 

 name refers to the list number. 

 I. Ovules naked on an open carpel; pollen falling di- 

 rectly on the micropyle of the ovule which is 

 without a pollen-chamber; trees or shrubs; ours 

 usually evergreen with narrow leaves; monecious, 

 rare]}' diecious. 2. 



1. 0\ules in a closed carpel or set of cari)els provided 



with a stigma for the reception of the i)ollen; 

 flowers more commonly- showy. 4. 



2. Leaves fanshaped, dichotomously veined, on thick 



wart-like dwarf branches; diecious trees. 



GiNKGOACEAE. 



a. Ginkgo. (1). 



2. Leaves not fanshaped and dichotomously veined, but 

 n.eedle-shaped. narrowl}^ linear, subulate or scale- 

 like. '3. 



."5. Leaf buds naked; carpels few. spiral; leaves on 

 feather-like dwarf branches which are deciduous. 



TaxOIX ACEAE. 



:i. Taxodium. (2). 

 • ». Leaf-buds naked; car])els few. opposite, sometimes 

 forming a black or blue berry-like fruit; leaves 

 opposite or whorled, rarely scattered, persistent 



JUNIPERACEAE. 



a. Carpellate cones oblong, the scales not peltate, b. 



a. Carjiellate cones globose or nearly so. the scales 



peltate, or forming a bluish berry-like fruit, c. 

 1). Cone scales (i-ln. the \ upper fertile. Thuja. (S). 



b. Cone scales 4-<!. the 2 ni)i)er fertile. 



Libocedrus. (!)). 



c. Cone with dr}- pt-ltate scales; ovules usually 2. 



Chamaecyparis. (l<i). 

 (:j:5) 



