Key to the Families 29 



d. Styles 2 or 3 or branched; ovary 1-4 celled e. 



e. Leaves palmately lobed or divided, the terminal ones sometimes 



simple 64. Moraceae, p. 394. 



e. Leaves not palmately lobed or divided f. 



f. Ovary and capsule 3-celled; juice usually milky 



147. EUPHORBIACEAE, p. 636. 



f. Ovary 1-celled; juice not milky g. 



g. Leaves stellate-pubescent beneath 



4350. Crotonopsis, p. 638. 



g. Leaves not stellate-pubescent beneath. 



Stipules scarious 2475. Paronychia, p. 442. 



Stipules none. 

 Leaves opposite. 



Flowers in heads or spikes, these often panicled; 



anthers 1-celled 79. Amaranthaceae, p. 427. 



Flowers sessile in the forks of a branching inflores- 

 cence 2483. Scleranthus, p. 444. 



Leaves alternate. 



Flowers and bracts scarious 



79. Amaranthaceae, p. 427. 



Flowers small, chiefly greenish, no scarious bracts. . . . 

 78. Chenopodiaceae, p. 418. 



b. Trees or shrubs. 

 Leaves opposite. 



Fruit 1-celled, a single samara 243. Oleaceae, p. 751. 



Fruit 2-celled, a double samara 163. Aceraceae, p. 654. 



Fruit 3-celled, not winged 169. Rhamnaceae, p. 659. 



Leaves alternate. 



Ovary 3-celled 169. Rhamnaceae, p. 659. 



Ovary 1- or 2-celled. 



Styles and stigmas 2 63. Ulmaceae, p. 390. 



Style and stigma 1. 



Anthers opening lengthwise 214. Thymelaeaceae, p. 694. 



Anthers opening by uplifted lids 102. Lauraceae, p. 480. 



Z. Ovary inferior or so closely and permanently invested by the calyx as to 

 appear so. 

 Plants parasitic on the branches of trees 67. Loranthaceae, p. 402. 



Plants not parasitic on trees. 



Plants aquatic 225. Haloragidaceae, p. 710. 



Plants not aquatic. 



Herbs with calyx colored like a corolla. 



Leaves opposite, simple 80. Nyctaginaceae, p. 432. 



Leaves alternate. 



Leaves simple 2112. Comandra, p. 402. 



Leaves compound 3381. Sanguisorba, p. 573. 



Trees or shrubs. 



Leaves scurfy 215. Elaeagnaceae, p. 695. 



Leaves not scurfy. 



Style 1; flowers solitary, in pairs or in umbel-like clusters 



6151. Nyssa, p. 728. 



Styles 2 123. Hamamelidaceae, p. 533. 



X. Ovary or its cells containing many ovules h. 

 h. Calyx none; ovary and fruit naked. 



Aquatic herbs 113. Podostemaceae, p. 512. 



Shrubs or trees 123A. Altingiaceae, p. 533. 



h. Calyx present j. 

 j. Ovary superior k. 



k. Ovaries 2 or more, separate 91. Ranunculaceae, p. 454. 



