136 
Cycas 16 species, glia islands of the Indian and the 
c Ocean, East India, Japan. 
Macrozamia 14 “ pes ia 
Bowenia i = Australia 
Encephalartos 12 ‘' ~— Africa 
Stangeria i, = Africa 
Zamia 30 ‘ South and Central America, West 
Indies, Florida. 
Microcycas | et Cuba. 
Ceraiozamia 6 “ Mexico. 
Dion 20 Mexico. 
In connection with the foregoing tabulation it may be noted 
that the cycads are restricted in their geographical efi ati 
to tropical and subtropical regions,? and that in the Old World 
the genus = includes the largest ates of species and has 
the most extended distribution, while the New World the 
most eee ae ibut ed. ach of eg other genera is more 
ned 
and the Mexican Benue one includes gue two species. Fro: 
a consideration of th d biologic tclee 
it is evident that the fu Lone a last mentioned represent types 
. Rass that a the verge of extinction. The three 
, Macrozamia, ere and Ceratozamia, confined 
eens to Australia, Africa, and Mexico, may be regarded 
as representing a biologic group that occupies a position inter- 
iate between the monotypic and the more prolific genera 
Id World tt 
In the Old t 
Cycas revoluta,. which grows in ence Tapas ees 34 N. latitude. In 
the oe n Florida represent 
those of high I oN. renee a other 
aoe cyca ads grow in Japan about 250 miles farihee north t in North 
merica, or at about the same latitude as Los Angeles, ae nia, on the 
Pacific coast, and Columbia, South Carolina, on the Atlantic side of the 
continent. 
