KEY TO THE FAMILIES 13 



Stamens as many as the petals and alternate with them, or 

 more. 

 Hypanthium flat or obsolete; disk fleshy. 



Styles united, arising in the center, between the nearly 

 distinct lobes of the ovary; small hydrophytic 

 plants. 70. Limnanthaceae 150 



Styles not arising between the ovaries; trees or shrubs. 

 Plants without secretins; glands in the bark. 



Plants with resiniferous tissue; fruit drupaceous; 

 seeds without aril; leaves in ours compoimd. 



77. Anacardiaceae 152 



Plants without resiniferous tissue ; fruit a loculic- 

 idal capsule; seed with a fleshy aril; leaves 

 simple. 76. Celastraceae 152 



Plants with secreting glands in the bark. 



72. Rutaceae 150 



Hypanthium cup-shaped or campanula te; disk obsolete or 



inconspicuous. 90. Lythraceae 160 



2. Ovary at least partly inferior. 



a. Stamens numerous. 



Ovary partly inferior. 



Fruit a capsule. 58. Hydrangeaceae 114 



Fruit a pome. 61. Malaceae 127 



Ovary wholly inferior. 



Sepals and petals 4 or 5. verv unlike each other; leaves ample. 



Trees or shrubs; fruit fleshy. 61. Malaceae 127 



Herbs with rigid hairs; fruit capsular. 



87. Loasaceae 157 



Sepals and petals nearly alike, at least the latter numerous; 

 leaves typically and in all ours mere scales or wanting ; suc- 

 culent plants armed with spines. 88. Cactaceae 158 



b. Stamens not more than twice as many as the petals. 



Styles wanting ; stigmas sessile. 92. Halorigidaceae 166 



Styles present. 



Plants without tendrils. 

 Styles distinct. 



Ovules several in each cavity of the ovary; fruit a cap- 

 sule or a fleshy many-seeded berry. 

 Fruit, if dehiscent, valvate. 



Leaves opposite; fruit a leathery capsule. 



58. Hydr.\nge.\ceae 114 

 Leaves alternate; fruit a berry. 



59. Grossulariaceae 115 

 Fruit circumscissile. 42. Portulacaceae 80 



Ovules solitary in each cavity of the ovary; fruit a 

 drupe or 2-5 more or less united achenes. 

 Fruit drupaceous or baccate; gynoecium 1-several- 

 carpellary, if 2-carpellary the stigmas introrse. 

 Ovule with a ventral raphe; leaves mostly alter- 

 nate; blades lobed or compound. 



94. Araliaceae 173 

 Ovule with a dorsal raphe; leaves mostly op- 

 posite; blades entire or merely toothed. 



95. CORNACE.\E 173 

 Fruit dry, a cremocarp; gynoecium 2-carpellary; 



stigmas terminal. 93. Ammiaceae 166 



Styles united, or single. 



Ovary enclosed in or surpassed by the hypanthium or 

 adnate to it. 

 Anthers opening by pores; fruit a berry. 



99. Vacciniaceae 176 



Anthers opening by slits; fruit a capsule. 

 Ovary with parietal placentae. 



87. Loas.\ceae 157 



Ovary with central or basal placentae. 



Hypanthium merely enclosing the ovary. 



90. Lythraceae 160 

 Hypanthium adnate to the ovary. 



91. Onagraceae 160 

 Ovary exceeding the hypanthium, the top free. 



58. Hydrangi.\ceae 114 



Plants with tendrils; fruit a pepo; leaf-blades palmately veined. 



129. Cucurbitaceae 222 



II. Petals more or less united. 

 A. Ovary superior. 



1. Stamens free from the corolla. 



Gynoecium of a single carpel; corolla papilionaceous. 



65. Fabaceae 129' 



Gynoecium of several united carpels. 

 Filaments united. 



