KEY TO THE FAMILIES 



vu 



Calyx tubular, its base hardening and 

 enclosing the achene. 

 Calyx not petaloid. 



Sepals herbaceous; herbage more or less 



succulent and scurvy. 

 Sepals membranous or scarious; flowers 

 with bractlets. 

 Ovary 3-10-celled. 

 Flowers perfect. 



Ovary 3-5-celied. 

 Ovary 10-celled. 

 Flowers monoecious or dioecious; ovary 3- 

 celled. 

 Pistils several, each 1-celled, 1-ovuled. 



Nyctaginaceae, 124. 



ChENOPODIACEAE, 113- 



Amaranthaceae, 121. 



AlZOACEAE, 126. 



Phytolaccaceae, 124. 



euphorbiaceae, 211. 

 Thalictrum, 142. 



2. Trees and Shrubs. 



Leaves opposite. 



Flowers dioecious; losv maritime shrub; leaves 



fleshy. 

 Flowers perfect or dioecious; sepals petaloid; fruit 



a tailed achene. 

 Flowers perfect; Iruit a samara. 

 Leaves alternate. 



Flowers perfect; sepals petaloid. 

 Sepals 6; stamens 9. 



Stamens opening by uplifted valves; aro- 

 matic tree. 

 Stamens splitting longitudinally; shrubs. 

 Calyx 5-cleft; stamens 5, monadelphous. 

 Flowers monoecious in head-like clusters. 

 Flowers perfect or unisexual; sepals and stamens 

 4 or 5 ; fruit berrj^-like. 



** Ovary inferior. 



Herbs; leaves alternate, divided. 



Woody plants, parasitic on trees or shrubs. 



Batidaceae, 123. 



Clematis, 140. 

 Fraxinus, 277. 



Lauraceae, 143. 

 Eriogonum, 106. 

 Fremontodendron, 

 Platanaceae, 176. 



RH.\MNUS, 221. 



D.\tiscaceae, 236. 



LORANTHACEAE, 100. 



Stamens tnore than 10. 



Petals present. 



* Ovary superior. 



I. Stamens Hypogynous. 



Pistils several to many. 



Pistils simple and distinct. 



Pistils becoming achenes or follicles. 

 Pistils at first united, becoming distinct and 

 forming tortulose pods. 

 Pistils cohering around a central axis. 

 Pistil 1. 



Pistil 1-celled. 



Sepals persistent. 

 Sepals 2. 



Sepals 5, tne 2 outer smaller, bract-like. 

 Sepals caducous; petals 4 or 6, twice as many 

 as sepals. 

 Pistil more than 1-celled. 



Ranunculaceae, 138. 



Platystemon, 145. 

 Malvaceae, 226. 



Calandrinia, 129. 

 Cistaceae, 232. 



Papaveraceae, 144. 

 Malvaceae, 226. 



Statnens 10 or fewer. 



Pistils more than 1, distinct or more or less united 

 around a central axis. 

 Pistils distinct. 



Pistils exceeding the sepals and petals in 



number. Ranunculaceae, 138. 



Pistils, petals and sepals of the same number. Crassulaceae, 165. 



