SIZE AND DISTRIBUTION OF STOMATES 



177 



TABLE 21 SIZE AND DISTRIBUTION OF STOMATES ON THE LEAVES OF VARIOUS SPECIES OF 



PLANTS (data OF ECKERSON, I908; SALISBURY, I927; KISSER, I929; MILLER, I93I; AND 

 YOCUM, 1935) 



Species 



Alfalfa {Medic ago sativa) 



Apple {Pyrus mains van) 



Barberry {Berberis vulgaris) 



Bean {Phaseolus vulgaris) 



Begonia {Begonia coccinea) 



Black Oak {Quercus velutina) 



Black Poplar {Popidus nigra) 



Black Walnut {Juglans nigra) 



Cabbage {Brassica oleracea) 



Castor Bean {Ricinus communis) 



Cherry {Prunus cerasus var.) 



Coleus {Coleus blumei) 



English Ivy {Hedera helix) 



English Oak {Quercus robur) 



Geranium {Pelargonium domesticum) . . 



Holly {Ilex opaca) 



Jimson Weed {Datura stramonium) . . . . 



Lilac {Syringa vulgaris) 



Linden {Tilia vulgaris) 



Maize {Zea mais) 



Mulberry {Morus alba) 



Nasturtium {Tropaeolum majus) 



Nightshade {Solanum dulcamara) 



Oat {Avena sativa) 



Pea {Pisum sativum) 



Peach {Prunus persica var.) 



Potato {Solanum tuberosum) 



Red Oak {Quercus rubra) 



Scarlet Oak {Quercus coccinea) 



Scilla {Scilla nutans) 



Sunflower {Helianthus annuus) 



Sycamore {Platanus occidentalis) 



Tomato {Lycopersicon esculentum) . . . . 

 Tree of Heaven {Ailanthus glandulosa) 

 Wandering Jew {Zebrina pendula) . . . . 



W'heat {Triticum sativum) 



Willow Oak {Quercus phellos) 



Wood Sorrel {Oxalis acetosella) 



Yew {Taxus baccata) 



Ave. no. of stomates 

 per cm- 



Upper 

 epidermis 



16,900 

 o 

 o 

 4,000 

 o 

 o 



2,000 



o 



14,100 



6,400 

 o 

 o 

 o 

 o 



1,900 



o 



11,400 



o 



o 



5,200 

 o 

 o 



6,000 



2,500 



10,100 

 o 



5,100 



o 

 o 



5,500 

 8,500 



o 



1,200 



o 



o 



o 

 o 

 o 



Lower 

 epidermis 



13,800 



29,400 

 22,900 

 28,100 

 4,000 

 58,000 

 11,500 

 46,100 

 22,600 

 17,600 

 24,900 

 14,100 

 15,800 

 45,000 



5,900 

 17,000 

 18,900 

 33,000 

 13,000 



6,800 

 48,000 

 13,000 

 26,300 



2,300 

 21,600 

 22,500 

 16,100 

 68,000 

 103,800 



5,100 

 15,600 

 27,800 

 13,000 

 38,600 



1,400 



1,400 

 72,300 



4,500 

 11,500 



Size (length X 

 breadth) of pore 

 when fully open 

 (lower epidermis) 



7 X3M 

 21 X 8m 



10 X 4 M 



10 X 5 M 



11 X 4M 



19 X I2ju 

 12.5 X 6.5 M 



19 X 5m 

 12 X 6m 

 38 X 8m 



22 X 8m 

 13 X 6 M 



31 X 12 M 



38X7M 



Refer- 

 ence 



M 



M 



K 



E 



E 



Y 



S 



K 



M 



E 



M 



E 



E 



S 



E 



K 



K 



K 



S 



E 



K 



E 



K 



E 



K 



M 



M 



Y 



Y 



S 



E 



K 



E 



K 



E 



E 



Y 



S 



S 



