14 Key to Sub-Classes and Natural Orders. 



M onochlamydeae. 



Perianth single, i.e. only the calyx present. 



Flowers perfect, ... 80 c^kJ^ il^^^-^ju^ -r hU£[-f. 

 Flowers monoecious or dioecious, 81 



80 Pistil apocarpous, 82 * 



80 Pistil synca rpous, 83 1 v^^-^-sxJl tfy^^flC^ , 



81 Leaves without stipules, 95 



81 Leaves with stipules 96 PAGE 



82 Stamens hypogynous, . . . [Ranunculaceae 17] 



82 Stamens perigynous, [Rosaceae 52] 



83 Ovary superior, 84 

 83 Ovary inferior, 85 



84 Style I or none, . 86 



84 Styles more than i , 88 



85 Style I, [Haloragaceae 60] 



85 Styles 2, $7 



85 Styles 6, Aristolochiaceae 128 



86 Stamens hypogynous, 89 



86 Stamens perigynous, 90 



By Stamens more than 4, [Saxifragaceae 64] 



87 Stamens 4, [Rubiaceae 76] 



88 Herbs, 91 



88 Trees, Ulmaceae 131 



89 Stamens many, . . . . , . . [Papaveraceae 22] 



89 Stamens 6, [Cruciferae 24] 



89 Stamens 5, ........ [Primulaceae 119] 



90 Herbs, [Lythraceae 60] 



90 Shrubs, 90* 



90 Trees, [Aceraceae 42] 



90*0vary 3-celled, [Rhamnaceae 44] 



90*0vary i -celled, Thymelaceae 127 



91 Leaves without stipules, 93 

 91 Leaves with stipules, 92 



92 Stipules qchreate, ^•^^'«'«^a^-. . . . Polygonaceae 125 



92 Stipules leaf-like, [Rosaceae 52] 



93 Flowers white, .... [Caryophyllaceae 33] 



93 Flowers green, 94 



