20 Key to the System of 



JYIONOCOTYLEDONEAE. 



89. Flowers provided with a conspicuous calyx ... ... 90 



Flowers unprovided with a conspicuous calyx. Figures 

 125 and 126. Acalyceae hypogynae. 104 



90. Stamens often inserted away from the base of the 



ovulary ; calyx high-adnate to the fruit. Figures 112 



to 116. Calyceae perigynae. 91 



Stamens often inserted at the base of or below the 

 ovulary; calyx beyond its base free from the fruit. 

 Figures 117 to 124. Calyceae hypogynae. 94 



Calyceae perigynae. 



91. Lower petal usually much unlike the two other. 



(Exception here : Thelymitra. ) 



Terrestrial or epiphytal plants ; flowers often exquisitely 

 showy ; calyx-lobes three, often petal-like ; stamen and 

 style connate (gynostemium) ; anther almost constantly 

 one ; fruit always longitudinally dehiscent ; placentaries 

 attached to the wall of the fruit-cavity ; seeds mostly 

 very minute. Figures 112 and 113. Orchicleae. 429 



All three petals usually alike ... ... ... 92 



92. Stamens and pistils mostly in separate flowers. 



Aquatic herbs ; petals often very tender and fugacious ; 

 fruit indehiscent ; placentaries attached to the walls of 

 the fruit-cavity ; seeds without albument. Figure 115. 



Hydrocharideae. 450 



Stamens and pistils usually in the same flowers ... 93 



93. Calyx-lobes petal-like, often very tender and fugacious. 



Nearly always land-plants ; flowers often large and showy ; 

 petals usually three, mostly equal ; stamens generally 

 three, always opposite to the calyx-lobes ; anthers burst- 

 ing on the outer side ; fruit longitudinally dehiscent ; 

 placentaries nearly always attached to the inner angles of 

 the fruit-cavity; seeds with albument. Figure 114. 



Irideae. 453 



