PARALLEL-VEINED LEAVES. 



89 



18. Digitate (finger-shaped), having narrower and deeper 

 segments than the pahiiate, as in the hemp. 



19. Pedate (foot-shaped). The same as palmate, except that 

 the two lateral lobes are themselves subdivided, as in the 

 peony and passion-flower. 



20. Laciniate (gashed), the nei-ves and veins all separate, as if 

 the blade were cut and gashed with scissors. Ex. Ranunculus. 



21. Peltate (shield-like)-, the nerves radiating in all directions, 

 and all connected by intervening tissue. This form is gener- 

 ally also orbicular, and appears to result from the union of the 

 base-lobes. Ex. Podophyllum peltatum, Tropeolun^, Brasenia. 



22. Rcmform, broad-ovate, broad- cor date, &c., may also rcsuh 

 from the radiate veining. 



234. The form of parallel-veined leaves is less diversified 

 than that of the preceding classes, being 



23. Linear, when the veins (or nerves) are straight, as in the 

 grasses. This form may also occur in the feather-veined leaf 

 by an equal development of all the veins, as in the Linaria vul- 

 firaris, &c. 



FIG. 31. 23, 24, 25, figures of leaves with parallel veins ; 2 — 10. margins of leaves. 



24. Oval, lanceolate, oblong, or some kindred form, when the 

 veins are cur\^ed, as in Carex, Cypripedium, Orchis, &c., or it 

 may be 



25. Cordate, when some of the lower veins are cun^ed back- 

 wards and then upwards, as in Pontaderia, and even sagittate, 

 when they are directed downwards at the base, as in the Sagit- 

 taria. 



8* 



