Schimper’s classification. 
1. Hygrophytes” : wet or damp situations=Hydrophytes. 
2. Xerophytes. 
Conditions favoring loss of water; dry air, rarity of 
air, high temperature, light, movement air. 
Conditions hindering root absorption; dry soil, 
cold soil, excess of salts or acids in soil. 
3. Tropophytest=Mesophytes of Warming,—three main 
types. 
1. Deciduous trees and shrubs. 
2. Perennial herbaceous plants. 
3. Annuals and bienntals. : 
Plant structures adapted to conditions of environment. 
A. Normal plant condition. 
1. Uniform conditions throughout year or season 
favor normal plant. 
Damp tropical regions. 
Vegetation luxuriant. 
Humid areas of temperate regions. 
2. Extremes of conditions induce modifications, 
or plant succumbs. 
B. Xerophytes or xerophytic structures. 
1. Physical factors which determine xerophytic 
vegetation two kinds. 
a. Those which decrease or limit water 
supply; relate to condition of soil. 
b. Those which accelerate loss of water by 
plant; relate to condition of air. 
2. Modifications designed for same purpose. 
a. To decrease loss of water. 
b. To increase absorption by roots. 
c. To conserve water for the plant. 
3. To decrease loss of water. 
: a. Reduction of leaf surface. 
b. Protective covering or movements. 
c. Action and position of stomata. 
d. Total absence of foliage leaves. 
tTropophytes. 7pérw (turn), durdv 
*Hygrophyte. vypds (moist), gputdv 
rAd | 
