MONOCOTYLEDONS 273 



According to one arrangement two groups may be 

 made, as follows : 



I. PetaloidecB, with Perianth Petaloid, often Coloured. 



{a) Perianth superior ; ovary inferior. 



Hydrocharidaceae. Amaryllidaceae. 



Orchidaceae. Dioscoraceae. 



Iridaceae. 

 {h) Perianth inferior or wanting ; ovary superior, 

 (a) Carpels free — 



Alismaceae, Naiadaceae. 

 (j3) Carpels united — 



Liliaceae. Araceae. 



Trilliaceae. Lemnaceae. 



Melanthaceae. Typhaceae. 



Juncaceae. 



II. Glumacece or Gliimiferce, with Glume-like Un- 

 coloured Perianth, 

 Cyperaceae (stems Graminaceae (stems 



solid). hollow). 



In another arrangement there are three main 

 divisions, dependent upon the character of the leaves 

 and perianth. 



I. D ictyo genes : Leaves net-veined; Floral Envelopes 

 whorled. 

 Trilliaceae. 

 Dioscoraceae. 

 VOL. III. 18 



