XXXVl 



INTRODUCTION. 



Ovule and seed solitary. Leaves stipulate. 

 Stipules sheatliiug. Leaves alteruute. 

 Stipules scarious. Leaves opposite. 

 Stipules not slieatliing' nor scarious. 

 Flowers perfect Acheoium 2-lobcd, spiny. 

 Flowers imperfect. 

 Uerba. Stems twining. Leaves 3 - 5-lobed 



Stems not twilling. Leaves serrate or entire. 

 Trees or slirubs. 



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-wiuged. 

 Flowers perfect or polygamous. 

 Fruit a berry. Calyx colored. 

 Fruit a samara. Leaves stipulate. 

 Ovules and seeds numerous in the cells, 

 Capsule 3-celIed Flowers solitary. 

 Capsule 5-celled. Flowers cymoso. 



POLYOONACE.'E, 884 

 ILLECEUUEiE, 46 



PETIVERIEiE, 874 



CANNABINACEJE, 414 

 URTICACEiE, 411 



TJLMACE.5:, 416 

 MOUACE.E, 414 



LAURACEiE, 393 



POLYGOXACEiE, 884 

 TUYMELEACE.E, 895 



AMARANTACEiE, 878 



NYCTAOTNACEiE 872 

 CUEXOPODIACEJE, 376 



EMPETRACE.'E, 410 

 MOLLUGINEiE, 45 



FRAXIXE.E, 369 

 ACEKACEiE, 80 



RnAMNACE.T",, 72 



FOKESTIKUK.i:, 3G9 



LYTUKACE.'E, 133 



EUPIIORBTACE.'E, 399 

 SAPINDACEJE, 78 



phytolacoaoe.t;, 374 



UL.MACE.E 416 

 Capsule circumscissilr. 



poktulac.vce.t;, 43 

 crassulace.u, 149 



Subclass II. GY^rNOSPERMOUS EXOGENOUS PLANTS. 



Ovulo.s naked (not contained in an ovary), Mip]iorti'd liy an opon scale 

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

 tion of tli(! pollen. 



Btflm bmnrhlni?. I><>nvc8 simple. 



Stem simple, p'ilm-liko. Leaves pinnata 



CONlFEItiH 481 

 CYCADACEiE, 437 



