VEINS AND RIBS OF LEAVES. 141 



lutea, t, 321, and Ixia crispa (more properly undu- 

 lata*) Curt, Mag. t. 599. ^ 



Crispum, f. 87, curled, when the border of the leaf be- 

 comes more expanded than the disk, so as to grow 

 elegantly curled and twisted, which Linnasus consid- 

 ers as a disease. Malva crispa^ Ger. em. 931, is an 

 example of it, and may probably be a variety of M. 

 verticillata, Jacq. Hort. Find. v. I. t. 40. 



Concavum, hollow, depressed in the middle, owing to a 

 tightness in the border, as Cyamus jYelumbo, Exot. 

 Bot. t. 32. 



Venosum^ Jl 8S, veiny, when the vessels by which the 

 leaf is nourished are branched, subdivided, and more 

 or less prominent, forming a network over either or 

 both its surfaces, as Crat^gus, or rather Fyrus, tor- 

 minalis, Engl. Bot, t. 298, and Verhascum Lychnitis, 

 t. 58. 



Neroosiim^f. 89, or costatum, ribbed, when they extend 

 in simple lines from the base to the point, as in Cyp- 

 ripediiim Calceoliis, t. 1, the Convallaria, t. 279 and 

 280, Stratiotes alismoides, Exot. Bot. t, 15, and 

 Roxburghia viridijlora, t. 57. The greater clusters 

 of vessels are generally called nej-vi or cost/^^ nerves 

 or ribs, and the smaller veiiis, veins, whether they are 

 branched and reticulated, or simple and parallel. 



Avenium, veinless, and enerve, ribless, are opposed to 

 the former. 



Trinerve^ f. 90, three-ribbed, is applied to a leaf that 

 has three ribs all distinct from the very base, as well 

 as unconnected with the margin, in the manner of 



* Salinb. Hort, o7 



