XXX Tutroduction. 
Sepals two. Herbs . ‘ 4 Portulacce, page 74 
Sepals more than two. 
Stamens hypogynous. 
Seeds plumoso, Shrybs with minute imbri- 
cated persistent leaves and small spicate 
flowers 3 ; 3 Tamariscinee, p. 7 
Seeds naked. Shrubs or trees with alternate 
leaves and inconspicuous flowers Pittosporce, p. 60 
Stamens perigynous. Shrubs or trees with 
evergreen or deciduous simple leaves and 
ineonspicuous flowers. Celastrine@, p. 100 
Calyx valvate or open. 
Stamens if equal in number to the petals, opposite to 
them. Shrubs with inconspicuous flowers Rhamnee, p.101 
Stamens if equal in number to the petals, alternate 
with them. Herbs having a tubular often 
coloured calyx and perigynous stamens Lythrariee, p. 195 
2, Flowers apetalous. 
A. Flowers destitute of both calyx and corolla. 
{ Leaves stipulate. 
Ovules numerous. Seeds plumose. Deciduous trees and shrubs 
with alternate deciduous simple leaves and diccious flowers 
arranged in catkins . . . . : Salicinee, p. 416 
Ovules solitary or very few. 
Flowers unisexual. 
Carpels solitary. Ovule erect. Deciduous shrubs covered 
with resinous glands. Flowers in catkins Myricacee, p. 413 
Carpels solitary. Ovule pendulous. Deciduous trees with 
large palmately - lobed leaves. Flowers in dense 
spherical heads. F : Platanacee, p. 405 
Carpels three. Shrubs or eke with small clustered often 
involucrate flowers . . . .  Luphorbiacee, p. 399 
tt Leaves exstipnlate. 
Shrubs with hermaphrodite spicate flowers, simple leaves, and 
jointed stems 7 . ‘ Piperacee, p. 399 
Shrubs or trees with small cutee flowers and opposite leaves 
Oleacce, p. 291 
Shrubs with simple deciduous leaves, usually covered with 
resinous vesicles : : Myricacea, p. 413 
B. Flowers with only one envelope, termed perendh or calyx. 
§ Ovary inferior or partially so. 
{ Leaves stipulate. 
Flowers hermaphrodite. Herbs or climbing shrubs with simple 
leaves and an irregular or regular campanulate or tubular 
perianth . . ‘ . : . Aristolochiacee, p. 397 
Flowers uvisexual. Fruit in a edits or involucre. Deciduous 
or evergreen trees or shrubs with alternate leaves and 
flowers usually in catkins 7 ‘ : Cupulifere, p. 408 
Flowers unisexual. Fruit naked, many-seeded, usually winged. 
Herbs . . ‘ . : f ‘ Begoniacee, p. 207 
tt Leaves exstipulate. 
Flowers unisexual, amentaceous. 
