S8 



THE LEAF. 



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

 sides. Ex. Bitter-sweet. 



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

 at base. Ex. Polygonnm 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 veinlets than on the imperfect development of the tissue 

 between them. 



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



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

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

 Taraxacum. 



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

 occasioned by deficiency of tissue between the lower veinlets ; 

 water-cress (Sisymbrium). 



15. Pinnatijid (feather-cleft), with deep sinuses between the 

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

 allel segments. Ex. Lepidium. 



16. Sinuate, having deep, rounded openings between the 

 veinlets, seen in the leaves of the white oak. 



233. R.iDiATE-VEiNED Icavcs assume luany forms, depending 

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

 vening tissue. Some of them are the following. 



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

 veins (227) separated by deep divisions, so as to resemble the 

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



