The reader may find the following distribution of pages and symbols
helpful in identifying plants:
2-16 Mostly lily-like, succulent plants.
17-91 Petals of flowers usually not united.
92-151 Petals usually united into tubular, bell-shaped,
funnelform, or salverform corollas.
152-193 Composites: many tubular flowers, often of two types,
growing in a head-like cluster.
P Prairies.
Pc Coastal prairies.
Ps Sandy prairies.
Pb Blackland prairies.
L Limestone hills.
W Woods and thickets.
Wo Post oak woods.
Wp Pine woods.
M Water or moist places.
C Chaparral.
T Trans-Pecos or mountainous region.
(See map p. xvi)