INTRODUCTION. 



Ovule and seed solitary. Leaves stipulate. 

 Stipules sheathiug. Leaves alternate. 

 Stipules scarious. Leaves opposite. 

 Stipules not sheathing nor scarious. 



Flowers perfect Achenium 2-lobed, spiny. 

 Flowers imperfect. 

 Herbs. Stems twining. Leaves 3 - 5-lobed, 



Stems not twining. Leaves serrate or entire. 

 Trees or shrubs. 



Juice watery. Flowers single or clustered. 

 Juice milky. Flowers included in a fleshy receptacle. 

 Ovule and seed solitary. Leaves without stipules. 

 Stamens more numerous than the calyx-lobes. 

 Anthers opening by valves. 

 Anthers opening lengthwise. 

 Calyx 5 - 6-parted. 

 Calyx entire. Berry oval. 

 Stamens equalling in number or fewer than the calyx-lobes. 

 Flowers with scarious bracts 

 Flowers without scarious bracts. 

 Calyx corolla-like, plaited. 

 Calyx herbaceous. Styles 2. 

 Ovary 2 - 12-celled. 

 Leaves whorled 

 A heath-like shrub Calyx of imbricated scales. 

 A prostrate annual. Calyx corolla-like. 

 Leaves opposite 

 Fruit a single samara. Calyx minute, persistent. 

 Fruit a double samara Calyx deciduous. 

 Fruit a drupe. 

 Flowers perfect. Stamens on the calyx. 

 Flowers dioecious. Stamens hypogynous. 

 Fruit a many-seeded capsule. Herbs. 

 Leaves alternate. 



Ovules and seeds 1 - 2 in each cell. 

 Flowers mono-dioecious. Fruit a drupe or capsule. 

 Flowers polygamous Capsule 3 - 4-winged. 

 Flowers perfect or polygamous. 

 Fruit a berry. Calyx colored. 

 Fruit a samara. Leaves stipulate. 

 Ovules and seeds numerous in the cells. 

 Capsule S-celled Flowers solitary. 

 Capsule 5-celled Flowers cymose. 



POLYGONACEiE, 

 ILLECEBRE^, 



384 



45 



PETIVERIILS:, 374 



CANNABINACE^, 

 URTICACEiE, 



ULMACE^, 



MORACE^, 



414 

 411 



416 

 414 



LAURACE^, 393 



POLYGONACE^, 384 

 THYME LEACE^, 395 



AMARANTACE^, 378 



NYCTAGINACE^ 

 CHENOPODIACE^, 



EMPETRACE^, 

 MOLLUGINE^, 



372 

 375 



410 

 45 



FRAXXNE^, 369 

 ACERACE.S;, 80 



RHAMNACE.E, 72 



FORESTIERE^, 369 



LYTHRACE^E, 133 



EUPHORBIACE^, 399 

 SAPlNDACRa;, 78 



PHYTOLACCACE^, 374 

 ULMACE.E 416 

 Capsule circumscissile. 



PORTULACACEiE, 43 

 CRASSULACEiE, 149 



Subclass II. GlTklNOSPERMOUS EXOGENOUS PLANTS. 



Ovules naked (not contained in an ovary), supported by an open scale 

 or leaf, or else terminating a branch, and fertilized by the direct applica- 

 tion of the pollen. 



stem branching. Leaves simple. 



Stem simple, palm-like. Leaves pinnate. 



CONIFERiE 431 

 CYCADACEiE, 437 



