‘a. Dissected leaves of aquatic 
\) | plants. 
b. Lobed and aerial leaves. 
c. Needle leaves of conifers. 
‘Examples, leaves of Juni- 
per, Arbor vitae, Cy- 
ys press, yucca, Cassiope, 
| Pyxidanthera, Live-for- 
ever. 
4. Elimination of the leaf. 
Cacti, Phylloclades. 
Stem contains the chlorophyll, provides 
water storage. 
II. Protective positions. 
(1) Leaves arranged in relation to ground, each 
other, or to give protection tremmugea 
great radiation. 
Cassiope, Pyxidanthera, juniper, arc- 
tic plants. 
(2) Position affected by light stimulus, day and 
night positions, Leguminosae, Mimosa, 
compass plant. 
_ Relation of leaves to light, Heliotropism. 
Day and night positions contrasted. 
Profile—a protective position. 
1. Those with pulvinus, clovers, peas, beans, oxalis, 
telegraph plant. 
2. Those without pulvinus due to epinastic growth or 
caused by light. 
T.eaves which rotate with the sun. 
Sunflower, young seediings, Cassia marilandica, cotton 
plant. 
Fixed position of old leaves. 
Position on horizontal stems. 
Relation of stem, petiole and blade. 
Position of leaflets on divided leaves. 
Compare entire leaf, compound leaf, dissected leaves, mill- 
foil, aquatic plants. 
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