CLASSIFICA TION. 
r 39 
Thus the Ferns, Equisetaceae, Selaginellas, Cycads, Coni- 
fers, Palms, most Araceae, Pandanaceae, Bromeliaceae, Musa- 
ceae, Sarraceniaceae, Droseraceae, Cactaceae, Lentibularia- 
ceae, &c. are recognisable by their general habit; Cannaceae, 
Marantaceae, Zingiberaceae, most Polygonaceae, many Ru- 
taceae and allied orders, Melastomaceae, &c. by their habit 
taken together with some peculiarity of the vegetative 
organs ; the inflorescence enables one to recognise Typha- 
ceae, Piperaceae, Salicaceae, Betulaceae, Fagaceae, Um- 
belliferae and their allies, Boraginaceae and allied orders, 
Dipsaceae and Compositae ; obvious floral characters point 
out such families as Gramineae, Cyperaceae, Liliaceae, 
Orchidaceae, Proteaceae, Ranunculaceae, Cruciferae, Legu- 
minosae, most Rosaceae, Polygalaceae, Malvaceae and 
their allies, Melastomaceae, Umbelliferae, Ericaceae, Primu- 
laceae, Asclepiadaceae, Boraginaceae, 'Labiatae, Rubiaceae, 
Compositae, &c. When a plant belongs to one of the 
biological groups described in Ch. III., its identification is 
often rendered easy by the small number of plants with 
which comparison has to be made. 
