Classification of Plants 



265 



i 



i. Light 



2. Heat 



3. Moisture 



4. Wind 



5. Plants 



6. Animals 



7. Man 



ADAPTATIONS OF STEMS. 



1. Heliotropism (bending to light) 



2. Erect position 



3. Branching 



4. Elongated or climbing 



5. Branching only at extreme top 



6. Underground stems 



1. Bark and hardened cuticle 



2. Underground below frost 



3. Periodic diminution 



4. Flow of sap 

 c. Hairs 



1 . Cuticle prevents evaporation 



2. Rosin 



3. Hairs 



4. Powder 



. 5. Creeping and floating posture 



1. Hard heart wood 



2. Hollow 



3. Firmly rooted 



4. Low and prostrate 



5. Flexibility 



6. Drying and carrying seeds in wind 



1. Hollow for strength 



2. Firm and woody for support 



3. Long and slender for twining 



4. Divided and slender for floating in water 



5. Underground for protection and propagation 



6. Branched for leaf exposure 



7. Covered with bark or cuticle for protection 



1. Spiny for protection 



2. Covered with bark for protection 



3. Hairy for protection from insects 



4. Sticky for protection 



5. Bitter for protection 



1. Hard and woody for use 



2. Soft and juicy for use 



3. Tall and graceful for beauty 



4. Tough and flexible 



5. Light and heavy 



6. Spicy 



L 7. Sweet and bitter 



