NUM15ER OF STO.MATA 



53 



Olive, Olea europaca 



Black Walnut, Ju<>;laiis nigra 



Red Clover, Trifoliuni pratense 



Lilac, Syringa vulgaris 



Sunflower, Helianthus annuus 



Cabbage, Brassica oleracea 



Sycamore, Platanus occidentalis 



Lombardy Poplar, Populus nigra italica. 



Hop, Huniulus lupulus 



Plum, Prunus domestica 



Apple, JMalus malus 



Barberry, Berberis vulgaris 



Pea, Pisum sativum 



Box, Buxus sempervirens 



Cherry, Prunus mahaleb 



Thorn Apple, Datura stramonium 



Indian Corn, Zea maj^s 



Cottonwood, Populus deltoides 



Wind Flower, Anemone nemorosa 



Lily, Lilium bul])iferum 



Iris, Iris germanica 



Oats, Avena sativa 



House leek, Sempervivum tcctorum 



Water Lily, Castalia lotos 



relation to the substomatal chambers and the inter-cellular 

 spaces of the leaves. 



(d) Make a cross-section of the leaf of oleander {Xcrium 

 oleander) or rubber plant {Fieus elastiea). In the former the 

 epidermis is in two layers, and in the latter sometimes as much 

 as four. This point can only be determined by making com- 

 parative sections of very young leaves and okl loaves. Note 

 the depressed, cistern-Hke pits in the oleander leaf, into 

 which the stomata open. 



