32 ANALYTICAL KEY. 



C. Glujiaceous Division. Flowers destitute of any proper perianth, except 

 sometimes small scales or bristles, but covered by glumes, j. e husk-like or scale- 

 like bracts. 

 Glume a single scale-like bract with a flower in its axil. . Cvperace^, .5.50 

 Glumes in pairs, of two sorts Gramine^, 602 



Series II. CRYPTOGMIOUS or FLOWERLESS PLANTS : 



those destitute of stamens and pistils, in fructification producing spores 

 instead of seeds. 



Class III. ACROGENOUS PLANTS. 

 Plants -with a stem containing woody tissue and vessels, as does the 

 foliage when there is any (in the form of veins). 

 Fructification of several spore-cases borne on the under 



side of the shield-shaped stalked scales of a terminal 



spike or cone. Leaves none, except a whorl of teelh 



at each joint of the stem. Equisetace^, G.'iS 



Fructification borne on the leaves (fronds), commonly on 



their backs or margins Filices, 6.5.') 



Fructification of spore-cases in the axil of simple leaves 



or bracts. Ltcopodiace^, 672 



Fructification on the branches or petioles. . . Htdroptekiues, 677 



