xxxvlii INTRODUCTION. 
t 
Herbs. Stamens 6. Leaves3 ina whorl. Flower single. ° TRILLIACEJE, 475 
Leaves alternate, sheathing. COMMELYNACEJ, 497 
Stamens 3. Flowers perfect, solitary. Stem leafy. MAYACACEX, 498 
Flowers perfect, capitate. Scape leafless. XYRIDACEJE, 499 
Stamens 8 or 4. Flowers monecious, capitate, Scape leafless. 
ERIOCAULONACE, 502 
* * * Flowers glumaceous, i. e. with scale-like bracts, in place of proper floral envelopes. 
Bracts single. Sheaths closed. Fruit an achenium. CYPERACEZ, 504. 
Bracts by pairs. Sheaths open. Fruit a caryopsis. GRAMINEZ, 545 
Series Il. CRYPTOGAMOUS or FLOWERLESS 
PLANTS. 
Plants destitute of proper flowers, and producing, in place of 
seeds, minute bodies (spores) which do not — an embryo. 
Crass III. ACROGENS. 
Plants with a distinet stem containing woody and vascular Emu, 
growing from the apex only. 
Fructification borne on the under side of a peltate scale. EQUISETACER, 585 
Fructification borne on the back or margins of the leaves (fronds). FILICES, 585 
Fructification borne in the axil of small leaves or bracts. LYCOPODIACEZ, 600 
Fructification borne at the base of the leaves. HYDROPTERIDES, 602 
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