12 KEY TO THE FAMILIES 



Stamens not adnate to the gynoecium. 



Stamens with wholly or partly united filaments. 



Anthers opening lengthwise: corolla regular. 



Leaves punctate; filaments polyadelphous, 



i. e., united in three or more bundles. 



82. HyPERICACE.VE 156 



Leaves not punctate; filaments monadel- 

 phous. i. e., united in a single hiuidle 

 Styles vuiitied around a central column 

 from which they break at matur- 

 ity. 66. Ger.\ni.vce.\e 148 

 Styles distinct or permanently and 

 partly united ; the tips and the 

 stigmas free. 

 Leaves simple; stamens 5. 



68. Lix.\rE.\E 149 

 Leaves compound; stamens 10-15. 



67. OX.\LIDACE.\E 149 



Anthers opening by pores; corolla irregular. 



73. POLYG.\L.\CE.\E l.'iO 



stamens with distinct filaments. 

 Anthers luiited; flowers irregular. 



69. B.\LSAMINACE.\E 149 



Anthers distinct; flowers regular or nearly so. 

 Anthers opening by pores. 



Gynoecium superior; fruit usually cap- 

 sular. 

 Herbaceous saprophytes without 

 green leaves. 



97. jMonotropaceae 174 



Herbs with green leaves and root- 

 stocks. 96. Pyrolaceae 174 

 Gynoecium inferior; fruit baccate or 

 drupaceous. 



99. VACCINI.AlCEAE 176 



Anthers opening by slits. 



Stigmas or styles distinct and cleft, 

 or foliaceous. 



74. Euphorbiaceae 150 

 Stigmas or styles distinct or united, 



neither cleft nor foliaceous. 

 Style wanting; dwarf water plants. 



s:3. Elati.vaceae 156 



Styles present; not water herbs. 

 Stamens 2, rarely 3. 



101. Oleaceae 179 



Stamens more than 3. 



Leaves punctate with trans- 

 lucent dots. 



72. RUTACEAE 150 



Leaves without translucent dots. 



Calyx irregular, one of the 



sepals spurred or saccate; 



anthers imited around the 



stigma. 



69. Bai.s.\min.\ceae 149 

 Calyx regular; none of the 



sepals saccate; anthers 

 distinct. 

 Style basal, arising between 

 the nearly distinct lobes 

 of the ovary: leaves odd- 

 pinnate. 



70. LIMNANTIIACEAE 150 



Styles not basal; leaves in 

 burs abruptly pinnate, or 

 digitate. 



71. Zygopiiyllaceae 150 



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

 nous or hypogynous). 



Styles and upper part of the ovaries distinct. 



57. S.\XIFRAG.\CE.\E 110 



styles united. 



Stamens as many as the petals and opposite them. 



Fruit a samara. 78. AcERACE.\E 153 



Fruit a berry, drupe, or capsule. 



Sepals manifest; petals involute: fruit capsular or dru- 

 paceous; ours shrubs or trees. 



79. RlIAMNACEAE 153 



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



ours vines with tendrils. SO. Vitaceae 154 



