Introduction. XXXi 
Leaves simple, alternate, usually furnished with resinous 
glands a 5 . . . 4 Myricacce, page 413 
Leaves simple, opposite. Evergreen shrub . : Garrya, p. 217 
Leaves compound. Deciduous trees, often having a balsamic 
juice ‘ ‘ 3 : Juglandacee, p. 406 
Flowers unisexual, not amentaceous. ‘Tender herbs having 
ornamental fruits. a : Fi .  Cueurbitacee, p. 206 
Flowers hermaphrodite or polygamous. 
Leaves with transparent dots. Evergreen shrubs or trees 
with numerous stamens a ° . Myrtaceae, p. 193 
Leaves without dots. 
Ovary 38- to 6-celled, many-seeded. Herbs or climbing 
shrubs with an irregular or campanulate perianth 
Aristolochiacee, p. 397 
Ovary 1-celled, 1-seeded. Herbs or shrubs usually having 
scaly leaves , ‘ : .  Chenopodjacee, p. 388 
§§ Ovary superior. 
+ Leaves stipulate. 
Flowers hermaphrodiie. 
Carpels more than one, combined into a solid pistil. 
Perianth colonred, valvate ; stamens monadelphous, hypa- 
gynous. A shrub . ‘1 a : Fremontia, p. 84 
Perianth membranous. Fruit winged or drupaceous. Trees 
with simple alternate deciduous leaves . Ulmacee, p. 403 
Carpels solitary or quite separate. 
Styles terminal, three to each ovary. 
Herbs with sheathing, often fringed stipules Polygonacee, p. 383 
Herbs with simple stipules . . .  Phytolaccacee, p. 387 
Flowers unisexual. 
Carpels mora than one, combined into a solid pistil. 
Flowers amentaceous. Deciduous trees with simple leaves 
Betulacee, p. 414 
Flowers not amentaceous . - +  Euphorbiacee, p. 399 
Carpels solitary. 
Herbs with lobed leavesand exalbuminous seeds Cannabinacce, p. 403 
Trees or shrubs with large stipules. ‘ . Moracce, p. 401 
tf Leaves exstipulate. 
Flowers hermaphrodite. 
Carpels more than one, combined into a solid pistil. 
Perianth short, herbaceous, 
Embryo curved round mealy albumen. Herbs or shrubs 
Phytolaccacce, p. 387 
Perianth tubular, coloured. Herbs or undershrubs Lythrariee, p. 195 
Carpels solitary or quite separate. 
Carpels several. Stamens hypogynous. Herbs or climb- 
ing shrubs with petaloid sepals and very small de- 
formed petais or none 5 . : Ranunculacee, p. 1 
Carpel solitary. 
Anthers with recurved valves. Evergreen or deciduous 
trees or shrubs . . . . . Lauraceae, p. 392 
Perianth tubular, coloured, hardened at the base. Herbs 
Nyctaginacce, p. 385 
