APETALOUS EXOGENOUS PLAIH'S. 519 



mixed with woody bundles or plates, inclosed in a cylinder 

 of woody fiber and spiral vessels; leaves pinnate, coiled in 

 the bud, like Ferns ; flozvers dioecious, destitute of calyx 

 and corolla; sterile fioiuers consisting of 1-celled anthers 

 inserted under the peltate scales of a cone-like ament; fer- 

 tile flowers consisting of naked ovules inserted under the 

 scales like the sterile flowers, or on the margins of con- 

 tracted leaves; seed nut-like; embryo in the axis of the 

 albumen ; radicle ending in a long spiral cord ; cotyledons 2. 



ZAMIA, L. 



Fioiuers in cone-like aments, with the peltate scales 

 inserted on all sides of the common rachis ; anthers nu- 

 merous; ovules by pairs, pendulous; seed roundish, drupe- 

 like. — Leaflets thickened at the base and articulated with 

 the petioles, with numerous simple veins. 



