Key to the Families 31 



Ovary several-celled. 



Calyx valvate in the bud. 



Herbs or rarely shrubs; stamens united; anthers 1-celled 



175. Malvaceae, p. 666. 



Trees ; anthers 2-celled 174. Tiliaceae, p. 665. 



Calyx imbricate in the bud. 



Leaves tubular with a flange at the top, radical 



110. Sarraceniaceae, p. 511. 



Leaves petiolate, mostly peltate or flattish; plants aquatic 



88. Nymphaeaceae, p. 450. 



p. Calyx more or less adherent to a compound ovary. 

 Ovary 7-30-celled. 



Cells many-ovuled ; aquatic herbs 88. Nymphaeaceae, p. 450. 



Cells 10, each 1-ovuled; shrubs or trees 3343. Amelanchier, p. 531. 



Ovary 6-celled 2170. Asarum, p. 403. 



Ovary 1-5-celled. 



Plants without leaves (in the popular sense), more or less spiny; petals 



many, yellow 210. Cactaceae, p. 694. 



Plants with leaves. 



Sepals or calyx lobes 2; ovules arising from the base of a 1-celled ovary. . 



85. PORTULACACEAE, p. 434. 



Sepals or calyx lobes more than 2. 



Leaves opposite; stipules none 117. Saxi frag ace ae, p. 514. 



Leaves alternate. 



Stipules present 126. Rosaceae, p. 524. 



Stipules none; shrubs 241. Styracaceae, p. 751. 



o. Stamens not more than twice as many as the petals u. 



u. Stamens of the same number as the petals and opposite them. 



Ovaries 3-6, separate; herbaceous vines (rarely woody in Indiana) 



94. Menispermaceae, p. 477. 



Ovary only one. 

 Ovary 2-4-celled. 



Calyx lobes minute or obsolete; petals valvate 170. Vitaceae, p. 661. 



Calyx 4- or 5-cleft; petals involute 169. Rhamnaceae, p. 659. 



Ovary 1-celled. 



Anthers opening by uplifted lids 93. Berberidaceae, p. 475. 



Anthers not opening by uplifted lids. 



Style 1, unbranched; stigma 1 237. Primulaceae, p. 744. 



Styles, style branches or stigmas more than 1. 



Sepals or calyx lobes 2 85. Portulacaceae, p. 434. 



Sepals or calyx lobes 3-5 4350. Crotonopsis, p. 638. 



u. Stamens not of the same number as the petals or if of the same number 

 alternate with them v. 

 v. Calyx free from the ovary, i. e. ovary wholly superior w. 

 w. Ovaries 2 or more, wholly separate or somewhat united x. 



x. Stamens united with each other and with a large thick stigma com- 

 mon to the 2 ovaries 248. Asclepiadaceae, p. 764. 



x. Stamens free from each other and from the pistils y. 

 y. Stamens on the receptacle, free from the calyx. 



Leaves punctate with translucent dots 137. Rutaceae, p. 632. 



Leaves without translucent dots. 



Trees 4124. Ailanthus, p. 632. 



Herbs. 



Ovaries or lobes of the ovary 2-5, with a common style. 



Ovary 2- or 3-lobed 152. Limnanthaceae, p. 647. 



Ovary 5-lobed 129. Geraniaceae, p. 623. 



Ovaries with separate styles or sessile stigmas 



91. Ranunculaceae, p. 454. 



