NUMBER OF STOMATA 



53 



In one square 

 millimeter 



Upper Lower 

 side side 



Olive, Olea europaea 



Black Walnut, Juglans nigra 



Red Clover, Trifolium pratense 



Lilac, Syringa vulgaris 



Sunflower, Helianthus annuus 



Cabbage, Brassica oleracea 



Sycamore, Platan us occidentalis 



Lombardy Poplar, Populus nigra italica. . . 



Hop, Humulus lupulus 



Plum, Prunus domestica 



Apple, Malus malus 



Barberry, Berberis vulgaris 



Pea, Pisum sativum 



Box, Buxus sempervirens 



Cherry, Prunus mahaleb 



Thorn Apple, Datura stramonium 



Indian Corn, Zea mays 



Cottonwood, Populus deltoides 



Wind Flower, Anemone nemorosa 



Lily, Lilium bulbiferum 



Iris, Iris germanica 



Oats. Avena sativa 



House leek, Sempervivum tectorum 



Water Lily, Castalia lotos 





 



207 

 



175 



138 







55 



















101 

 

 



114 



94 



89 











65 



48 



11 



625 



625 



461 



335 



330 



325 



302 



278 



270 



256 



253 



246 



229 



216 



208 



204 



189 



158 



131 



67 



62 



58 



27 



14 







relation to the substomatal chambers and the inter-cellular 

 spaces of the leaves. 



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

 oleander) or rubber plant (Ficus elastica). 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 old leaves. Note 

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

 which the stomata open. 



