xxxvi INTRODUCTION. 
Ovule and seed solitary. Leaves stipulate. 
Stipules sheathing. Leaves alternate. POLYGONACEZ, 384 
Stipules scarious. Leaves opposite. ILLECEBREJE, 45 
Stipules not sheathing nor scarious. à 
Flowers perfect. Achenium 2-lobed, spiny. PETIYERIEJE, 374 
Flowers imperfect. i 
Herbs. Stems twining. Leaves 3 - 5-lobed. CANNABINACEZ, 414 
Stems not twining. Leaves serrate or entire. URTICACEJE, 411 
Trees or shrubs, 
Juice watery. Flowers single or clustered. ULMACEZ, 416 
Juice milky. Flowers included in a fleshy receptacle. MORACEZ, 414 
Ovule and seed solitary. Leaves without stipules. 
Stamens more numerous than the calyx-lobes. 
Anthers opening by valves. LAURACEJE, 393 
Anthers opening lengthwise. 
Calyx 5 - 6-parted. POLYGONACEJE, 384 
Calyx entire. Berry oval. THYMELEACEZE, 395 
Stamens equalling in number or fewer than the calyx-lobes. 
Flowers with scarious bracts. _ AMARANTACEJE, 378 
Flowers without scarious bracts. 
Calyx corolla-like, plaited. NYCTAGINACEJE, 372 
Calyx herbaceous. Styles 2. CHENOPODIACEJE, 375 
Ovary 2 - 12-celled. 
Leaves whorled. : 
A heath-like shrub. Calyx of imbricated scales. EMPETRACEZE, 410 
A prostrate annual Calyx corolla-like. MOLLUGINEZE, 45 
Leaves opposite. 
Fruit a single samara. Calyx minute, persistent. FRAXINEJE, 369 
Fruit a double samara. Cys terere ACERACEJE, 80 
. Fruit a drupe. ' 
Flowers perfect. Stamens on the calyx. ? RHAMNACEX, 72 
Flowers dicecious. Stamens hypogynous. . FORESTIERE®, 369 
Fruit a many-seeded capsule. Herbs. LYTHRACEJE, 133 
Leaves alternate. 
Ovules and seeds 1 —2 in each cell. 
Flowers mono-dicecious. Fruit a drupe or capsule. EUPHORBIACEJE, 399 
Flowers polygamo Capsule 3- - 4-winged. $ SAPINDACEJE, 78 
Flowers perfect or ous. 
x Fruit a berry. Calyx colored. PHYTOLACCACEZ, 374 
Fruit a samara, Leaves stipulate. ULMACE®, 416 
Ovules and seeds numerous in the cells. Capsule cireumscissile. 
Capsule 3-celled, Flowers solitary. PORTULACACEJE, 43 
| Capsule 5-celled. Flowers cymose. CRASSULACEJE, 149 
Suscrass IL GYMNOSPERMOUS EXOGENOUS PLANTS. 
| Ovules naked (not contained in an ovary), supported by an open scale 
or leaf, or else terminating — and —— e ote ; 
