16 



ROOT 



FIG. 5. LONG. SECTION of root of Bean plant 



'Central fibro- vascular bundle, surrounded by cortical parenchyma 



and epidermis. 



Epidermis, one layer thick ; at tip of root split into several layers 

 forming the root-cap or pileorhiza (L. pileus, a cap ; Gr. rhiza, 

 a root). 



( Appendages of the root developed endogenously (Gr. endon, within ; 

 EOOTLETS ....-( gennao, I produce), and repeating the structure of the main 



(^ root. 

 LEAP 



FIG. 6. The STALK or PETIOLE of Horse Chestnut leaf 

 Repeats the characters of the one-year-old stem. 

 FIG. 7. The LEAF BLADE or LAMINA of the Cherry Laurel 



C Upper epidermis, colourless, a single layer, with the outer walla 



thickened forming cuticle. 

 EPIDETTMIS . i T -i ,, , , 



Lower epidermis, like upper epidermis, but stornata more 



L abundant. 

 GROUND OR CORTICAL J Palisade tissue. 



PARENCHYMA . . . ( Loose tissue with less chlorophyll. 

 Fibro-vascular bundles, forming veins. 

 FIG. 8. EPIDERMIS of HYACINTH 



Stoma, the opening (Gr. stoma, a mouth). 

 Guard-cells (red), two surrounding each stoma. 



CLASSIFICATION OF PEA OR BEAN PLANT. 



Sub-Kingdom Phanerogamia, because the sexual organs are conspicuous (Gr. phaneros, visible 



gamos, sexual union). 

 Class Dicotyledon 



The young plant has two cotyledons (PI. VII. fig. 4). 



The fibre-vascular bundles form a ring round the pith (PI. VIII. diag.). 



Leaf has reticulated venation. 



Flower leaves arranged in fives (PI. VI. fig. 9). 

 Order Leguminosa3, distinguished by the arrangement of the corolla leaves, and the fruit a pod 



or legume. 

 Genera Pisum (pea), Vicia (bean). 



