XXXV 



INTRODUCTION. 



Ovule and seed solitary. Leaves stipulate. 

 Stipules sheathing. Leaves alternate. 

 Stipules scarious. Leaves opposite. 

 Stipules not sheathing nor scarious. 



Flowers perfect Acheniuin 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 3-eelled Flowers solitary. 

 Capsule 5-celled Flowers cymose. 



POLYGONACE.E, 

 ILLECEBUE^, 



384 

 45 



PETIVERIE3:, 374 



CANNABINACEjE. 

 UKTICACEiE, 



ULMACEJE, 



MOKACE.E, 



414 



411 



416 



414 



LAURACE.E, 393 



POLYGONACEJE, 

 THYMELEACEJE, 



884 



AMARAXTACE.E, 378 



NYCTAGINACEiE 372 

 CUEXOPODIACE.E, 375 



EMPETRACE^l, 410 

 MOLLUGINE.E. 45 



FRAXINE.3E, 369 

 ACERACEJ3, 80 



RIIAMNACE.E, 72 



FOKESTIERE.E, 359 



LYTIIRACE^, 133 



EUPIIORBIACEiE, 

 SAPINDACE.E, 



PIIYTOLACCACE.E. 374 

 UL5IACEJE 416 

 Capsule circumscissile. 



POKTULACACE.E, 43 

 CRASSULACEJt: 149 



Subclass II. GYMNOSPERMOUS 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 



CONIFER2E 431 

 CYCADACEJ3, 437 



