222 



GYMNOGENS. 



73. Cycadeace^. 



The Natural Orders of Gymnogens. 



Stem simple, continwus. Leaves parallel-veined, pinnate. Scales of 



tlie corve a^itheriferous 



Stem repeatedlyhranched, continuous. Leaves simple, acerose. Females\^, Vi^kcvm 



in cones , J ' 



Stem repeatedly branched, continuous. Leaves simple, often forJc- 



veined. Females solitary. Membrane next the nucleus inclosed. \ 75. Taxace/e. 



Anthers 2-cclled, opening longitudinally 



Stem repeatedly branched, jointed. Leaves simple, oiet-veinsd. 



Membrane ')iext the nucleus tubidar, protruded. Anthers \ -celled, \-lQ. GNETACEiE. 



opening by pores 





