S3 



THE LEAF. 



10. Hastate (halbert-shapecl), hollowed out at the base and 

 .sides. Ex. Bitter-sweet. 



11. Sagittate (arrow-shaped), with pointed, descending lobes 

 at base. Ex. Polygonum sagittatum ; Sagittaria ; &c. 



12. Reniform (kidney-shaped), broad, rounded at the apex, 

 and hollowed at the base, as in the Asarum Canadense. 



a. The following forms depend less upon the proportion of 

 the veins than upon the imperfect development of the tissue 

 between them. 



FIG. 30. — 12 — 16, figures of feather- veined leaves, the remainder of radiale-veiiied. 



13. Runcinatc (re-uncinate), having the margin extended at 

 the veins into pointed segments, which curve backwards. Ex. 

 Taraxacum. 



14. Lyrate (lyi-e- shaped), with several deep, rounded sinuses, 

 occasioned by deficiency of tissue between the lower veins. Ex. 

 water-cress ( Sisymbrium). 



15. Pinnatifid (feather-cleft), with deep sinuses between all 

 the veins, separating each margin of the leaf into oblong, par- 

 allel segments. Ex. Lepidium. 



16. Sinuate, having deep, rounded openings between the 

 M?ins, as seen in the leaves of the white oak. 



233. Eadiate-veined leaves assume many forms, depending 

 upon the direction of the veins, and the quantity of the inter- 

 Acning tissue. Some of them are the following. 



17. Palm ate (palm-shaped), having five lobes, with as many 

 ncn-es (227) separated by deep divisions, so as to resemble the 

 palm of the hand with the fingers. Ex. passion-flower. 



