PAKALLEL-VEINED LEAVES. 



89 



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

 segments than the pahnate, 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 veins and veinlets separate, as if 

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



21. Peltate (shield-like), the veins 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, Tropeolum, Brasenia. 



22. Rc7viform, hroad-ovatc, broad-cordate, &c., may also result 

 from the radiate veining. 



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

 than that of the preceding classes, being 



23. Linear, when the veins (and fibres) are straight, as in the 

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

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

 garis, &:c. 



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



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

 veins are curved, as in Carex, Cypripedium, Orchis, Sec, or it 

 may be 



25. Cordate, when some of the lower veins are curved back- 

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

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

 taria. 



