xxii INTRODUCTION 



m. Ovary superior 



(m) Stamens and pistils in different 



flowers; plants with tendrils Smilacaceae 312 

 (n) Stamens and pistils usually in 

 the same flower 

 r. Sepals and petals greenish, tiny 

 (r) Ovaries 3-6, separating, at 



least when ripe Juncaginaceae 303 



(s) Ovary 1, of 3 carpels Juncaceae 312 



s.. Sepals and petals typically 

 colored 

 (r) Stamens 3 Pontederiaceae 



314 

 (s) Stamens 6 Liliaceae 304 



n. Ovary inferior 



(m) Flowers perfect ; stamens 3 ; 



plants terrestrial Iridaceae 316 



(n) Flowers imperfect; stamens 



3-9 ; plants aquatic Hydrocharitaceae 



315 

 (y) Flowers irregular 

 m. Stamens many . Ranunculaceae 1 



n. Stamens 1-8 



(m) Sepals 3; petals 3, 1 large and 



lip-like Orchidaceae 316 



(n) Sepals 5, 2 petal-like; petals 3 Polygalaceae 30 

 (2) Petals 4 



(a) Flowers regular 

 x. Stamens 3-5 



(x) Leaves of 3 leaflets Rutaceae 40 



(y) Leaves simple 

 m. Shrubs 



(m) Ovary superior 

 r. Leaves opposite Celastraceae 211 



s. Leaves alternate Ledum in Erica- 



ceae 86 

 (n) Ovary inferior Cornaceae 222 



n. Herbs 



(m) Pistils separate Crassulaceae 188 



(n) Pistils united 



