XXXVl 



INTEODUCTION. 



Ovule and seed solitary. Leaves stipulate. 

 Stipules sheathing. Leaves alternate. 

 Stipules scarioua. Leaves opposite. 

 Stipules not sheathing- nor scurious. 

 Flowers perfect Achenium 2-lobed, spiny. 

 Flowers imperfect. 

 Uerbs. Stems twining. Leaves 3 - 5-lohed. 



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. 

 Fmit 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 circumscissile. 

 Capsule 8-celled Flowers solitary. PORTULACACE.aE, 



Capsule 6-Gelled Flowers cymose. CRASSULACE.^, 



NYCTAGINACE^ 

 CHENOPODIACEiE, 



EMPETRACEiEI, 

 MOLLUGINE^, 



376 



410 

 45 



FIlAXINE.ffi, ; 

 ACERACE.^, 



RHAMNACE^, 



FORESTIERE^, i 



LYTHRACE.a:, 



72 

 369 

 133 



EUPHORBIACE.^, 1 

 SAPINDACEiE, 



PHYTOLACCACE^, 

 ULMACE^, 



374 

 416 



43 

 149 



Subclass II GYMNOSPEEMOUS 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 Blmple, palm-like. Leaves pinnate. 



CONIFERS 431 

 CYCADACEa:, 437 



