I. Radiate type of leaf system of dandelion, beet, etc. 
2. Imbricate type as in broad leaved trees, and in the 
overlapping branch system of many pines, etc. 
This generalization is not necessarily correct, for as in the 
latter class, | 
1. Root and leaf distribution are governed by other 
and more important laws. | 
2. In hght rains the leaf surface holds back prac- 
tically all the water. 
3. In heavy and long continued rains the water 
breaks through the leaf system. 
4. Habit of plants to grow in dense societies. 
Kinds of roots. 
I. Fibrous root system. 
2 ap Toot system 
3. Aerial roots, for purposes of 
(1) Absorption of moisture from the air 
(Q)ySupport: 
Bracing or prop roots. 
Buttresses. 
Fleshy roots, or root tubers. 
Water roots and roots of water plants. 
Holdfasts. 
Haustoria or suckers. 
10. Rootlets or rhizoids. 
Oe CaS 
VI. THE FLOWER SHOOT. 
1, Patts of the Mlowen, 
The flower. 
Complete flower, buttercup, b!ood root, apple, rose, etc. 
Two sets of members, or organs, attached to the recep- 
tacle or torus. . 
I: Fioral envelope. 
2. Essential or necessary members or organs. 
Floral envelopes— (homology) 
1. Calyx (sepals) chiefly protective. 
2. Corolla (petals), two functions 
(1). . -Protechon 
(2),) Attract) insects: 
16 
