1 
KEY TO THE NATURAL ORDERS. 
Aiioide^. Flowers on a cylindrical spadix enclosed in a spathe, in Mauritian 
genera monoicous. Stamens various. Fruit baccate. Seed albuminous. — Herbs 
with broad net- veined leaves (page 403). 
CV. Lemnacese. Flowers minute, hermaphrodite, 1-3 in a spathe from a cleft 
at the edge of a floating frond Stamens solitary. Ovary 1 -celled. Seed albu- 
minous (page 404). 
Series II. GLUMIFER2E. Flowers produced in the axils of dry persistent 
bracts, with perianth absent or represented by minute scales or bristles. 
CYI. Cyperacese. Bracts 1 to each flower. Anthers basifixed. Leaf-sheaths 
closed (page 405). 
CVII. Gramineae. Bracts 2 to each flower. Anthers versatile. Leaf-sheaths 
open (page 428). 
Sub-kingdom CRYPTOGAMIA. 
Reproduction effected without stamens, ovules, or seeds which contain a distinct 
embryo. 
Series I. Capsules of all one kind. Spores falling to the ground to give rise to 
a prothallus on which antheridia and archegonia are developed. 
CVIII. Filices. Capsules aggregated in clusters on the back or edge of leafy 
fronds, rarely forming spikes or panicles. Spores without elaters (page 458). 
CIX. Equisetacese. Capsules placed on the underside of stalked peltate scales, 
which are aggregated into a cone at the end of a distinctly- jointed leafless stem. 
Spores with elaters (page 518). 
CX. Lycopodiacese. Capsules solitary in the axils of small closely-placed 1- 
nerved leaves. Spores without elaters (page 518.) 
Series II. Capsules of two kinds, one containing macrospores which give rise to 
a prothallus which bears archegonia and the other microspores which produce 
antheridia. 
CXI. Selaginellacese. Capsules of both kinds solitary in the axils of small 
closely -plaeed 1 -nerved leaves (page 522). 
CXII. Marsiliaceae. Capsules of both kinds contained in one common recep- 
tacle, which arises from a filiform rootstock or petiole (page 525). 
