ii GENERAL KEY. 



Endosperm none or very little; aquatic or marsh herbs. 



t NAIADALES 21 



Endosperm fleshy or horny; ovary superior or inferior. 



! LILTALES 93 



Endosperm mealy ; ovary superior XYRIP/ALES 90 



Flowers irregular OECHIDALES 107 



Embryo normally with 2 Cotyledons; stem with fibro-vascular bun- 

 dles in rings; mostly net-veined, flower parts not in threes. 



Subclass 2. DICOTYLEDONES 114 



Petals distinct to the base or wanting. Series 1. Choripetalae. 



PETALS NONE. 



A. Flowers not in catkins. 



1. Ovary and its cells containing many ovules. 



Ovary and pod inferior. 



Six-celled; stamens 6-12 ARISTOLOCHIALES 127 



Four-celled; stamens 4 Ludwigia in MYRTALES 232 



One-celled, with parietal placentae. . Chrysosplenium in ROSALES 170 

 Ovary and pod wholly naked (no calyx) . . . Podostemon in ROSALES 168 

 Ovary and pod superior. 



Five-celled and 5-beaked, opening across the beaks, which fall off 



at maturity; stamens 10 Penthorum in ROSALES 168 



Three-celled and 3-valved, or 3-5-celled and cireumscissile. 



Aizoaceae in CHENOPODIALES 132 

 Two-celled or 1-celled; placentae central. 



Stamens inserted on the throat or tube of the calyx. 



Lytheacbae in MYRTALES 230 

 Stamens inserted on the receptacle or base of the calyx. 



Glaux in PRIMTJLALES* SSg 

 One-celled, with one parietal pla- \ 

 centa or V Ranunculaceae in RANALES 143 



Ovaries 2 or more, separate, simple. ) 



2. Ovary or its cells containing 1 or 2, rarely S or 4, ovules. 



*PistUs more than one, and distinct or nearly so. 



Stamens inserted on the calyx; leaves with stipules. 



Sangtjisorba in ROSALES 178 

 Stamens inserted on the reeeptacle. 



Leaves punctate with pellucid dots. 



Xanthoxylum in GERANIALES 209 

 Leaves not dotted. 

 ■ Calyx present and usually petal-like. 



Ranunculaceae in RANALES 143 

 Calyx absent ; flowers entirely naked, perfect, spiked. 



PIPERALES 114 

 ** Pistil one, either simple or compound. 



Ovary wholly inferior. 



Aquatic herbs; ovary 3-4-celled. . Haloragidaceae in MYRTALES 230 

 Mostly woody plants; style or stigma one, entire, ovary 1-celled. 

 Stigma running down one side of the style. 



Nyssa in UMBELLALES 244 

 Stigma terminal, with or without a style SANTALALES 127 



Ovary really free from the calyx, but permanently invested by its tube, 

 or the base of it, so as to seem inferior. 



