KEY TO THE FAMILIES 7 



Calyx irregular, one of the 

 sepals spurred or saccate; 

 anthers united around the 

 stigma. 



69. Balsamnaceae 536 

 Calyx regular; none of the 



sepals saccate ; anthers 

 distinct. 

 Style basal, arising between 

 the nearly distinct lobes 

 of the ovary; leaves odd- 

 pinnate. 



70. LiMNANTHACEAE 537 



Styles not basal; leaves in 

 ours abruptly pinnate, or 

 • digitate. 



71 Zygophyllaceae 538 

 ** Stamens inserted on the margin of a disk or hypanthium (perigy- 

 nous or hypogynous). 



Styles and upper part of the ovaries distinct. 



57. S-AJCIFRAGAceae 376 

 Styles united. 



Stamens as many as the petals and opposite them. 



Fruit a samara. 78. Aceraceae 551 



Fruit a berry, drupe, or capsule. 



Sepals manifest; petals involute: fruit capsular or dru- 

 paceous; ours shrubs or trees. 



79. Rhamnaceae 553 



Sepals minute or obsolete; petals valvate; fruit a berry; 



ours vines with tendrils. 80. Vitaceae 556 



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 ovarv; small hydrophytic 

 plants. 70. Limnanthaceae 537 



Styles not arising between the ovaries; trees or shrubs. 

 Plants without secreting glands in the bark. 



Plants with resiniferous tissue; fruit drupaceous; 

 se^ds without arU; leaves in ours compound. 



77. Anacardl\ceae 550 



Plants without resiniferous tissue; fruit a loculic- 

 idal capsule; seed with a fleshy arU; leaves 

 simple. 76. Celastraceae 548 



Plants with secreting glands in the bark. 



72. RUTACEAE 539 



Hypanthium cup-shaped or campanulate; disk obsolete or 



inconspicuous. 90. Lythraceae 582 



Ovary at least partly inferior. 



a. Stamens numerous. 



Ovary partly inferior. 



Fruit a capsule. 58. Hydrangeaceae 392 



Fruit a pome. 61. Malaceae 445 



Ovary whoUy inferior. 



Sepals arid petals 4 or 5, very unUke each other; leaves ample. 



Trees or shrubs; fruit fleshy. 61. Malaceae 445 



Herbs with rigid hairs; fruit capsular. 



87. Loasaceae 569 



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

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

 culent plants armed with spines. 88. Cactaceae 575 



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



Styles wanting ; stigmas sessile. 92. Halorigidaceae 605 



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. Hydrakgeaceae 392 

 Leaves alternate; fruit a berry. 



59. Grossuiariaceae 394 

 Fruit circumscissile. 42. Portul.\caceae 262 



0\Tjles solitary in each cavity of the ovary; fruit a 

 drupe or 2-5 more or less united achenes. 

 Fruit drupaceous or baccate; gynoecium l-several- 

 cajpellary, if 2-carpellary the stigmas introrae. 



