KEY TO THE OEDEES. 



SUB-CLASS II. GYMNOSPERMS. 



Ovules and seeds naked, on the inner face of an open scale ; 

 or, in Taxua, without any scale, but surrounded by a ring-like 

 disk which becomes red and berry-like in fruit. 



Conifers. — Trees or shrubs, with resinous juice, and 

 mostly awl-shaped or needle-shaped leaves. Fruit 

 a cone, or occasionally berry-like 214 



CLASS II. MONOCOTYLEDONS. 



Distinguished ordinarily by having straight-veined leaves 

 (ihough oocaaioually net-veined ones), and the parts of the 

 flowers in threes, never in fives. Wood never forming rings, 

 but interspersed in separate bundles throughout the stem. 

 Cotyledon only 1. 



L SPADICEOUS DIVISION. 



Flowers collected on a spadix, with or without a spathe or 

 sheathing bract. Leaves sometimes net-Veined. 



AsAOE*. — Herbs (either flag-like marsh-plants, or terres- 

 trial, ) with pungent juice, and simple or compound 

 leaves, these sometimes net- veined. Spadix usu- 

 ally (but not always) accompanied by a spathe. 

 Flowers either without a perianth of any kind, 

 or with 4-6 sepals 217 



Typhacb^. — Aquatic or marsh plants, with linear straight- 

 veined leaves erect or floating, and monoecious 

 flowers. Heads of flowers cylindrical or globular, 



no spathe, and no floral envelopes 219 



LemnacE/E. —Small aquatics, freely floating about 218 



Naiadacb^. — Immersed aquatics. Stems branching and 

 leafy. Flowers perfect, in spikes, generally on the 

 surface 221 



IL PETALOIDEOUS DIVISION. 



Flowers not collected on a spadix, furnished with a corolla- 

 like, or occasionally herbaceous, perianth. 



