KEY TO THE FAMILIES 7 



Calyx irregular, one of the 

 sepals spurred or saccate; 

 anthers united around the 

 stigma. 



69. Bai^aminaceae 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. Ltmnantttaceae 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. Saxifragaceae 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. Riiaainaceae 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 tuiited, arising in the center, between the nearly 

 distinct lobes of the ovary; 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 ; 

 seeds without aril; leaves in ours compound. 



77. ANACARDIACEAE 550 



Plants without resiniferous tissue ; fruit a loculic- 

 idal capsule; seed with a fleshy aril; 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 



2. Ovary at least partly inferior, 



a. Stamens numerous. 



Ovary partly inferior. 



Fruit a capsiile. 58. Hydrangeaceae 392 



Fruit a pome. 61. Malaceae 445 



Ovary wholly inferior. 



Sepals and petals 4 or 5, very imlike each other; leaves ample. 



Trees or shrubs; fruit fleshy. 61. Malaceae 445 



Herbs with rigid hairs; fniit capsular. 



87. Loasaceae 569 



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 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 cai)- 



sule or a fleshy many-seeded berry. 

 Fruit, if dehiscent, valvate. 



Leaves opposite; fruit a leathery capsule. 



58. Hydrangeaceae 392 



Leaves alternate ; fruit a berry. 



59. GR0SSUL.\RTACEAE 394 



Fruit circumscissile. 42, Portulacaceae 262 



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. 



