132 SUBSTANCE, ETC. OF LEAVES. 



longs ; but his definition is foreign to tiie purpose, 

 see/;. 1 19, and alludes to the outline of a fiat 

 leaf. 



Triquetrum differs from tngonum only in being 



used by Linnaeus for a three-sided awl-shaped 



leaf, as M. emarginatum, Dill. Elth. t. 197, 



f. 9,50s and bicolorum, t. 202, also Sa.vifraga 



birrseriana. 



Tetragonum^ f, 100, four-edged, having four pro- 

 minent angles, as Iris tubcrosa, Fl. Grcec. t.^X. -J 



Lingidatnm^ tongue-shaped, of a thick, oblong, 'I 

 blunt fiHure, ^ieneraliv cartilaginous at the ed^es. ' 

 as MesembryantJiemum liuguifonne, Dendrobiiim 

 Ibiguiformc, E.vot. Bol. t. II, and several species 

 of ScLvifraga, as S. viutata. Curt. Mag. t. 351, 

 S. Cotijkdon, &c. 



Mcmbranaceum, membranous, of a thin and pliable 

 texture, as in Aristolochia SlpJio, t. 534, Rubtis 

 odoratusy t. 323, AlaguoUa purpurea, t. 390, &c. 



Corlacewn, leathery, thick, tough and somewhat 

 rigid, as MagiioUa grandlflora, -..lid Hydrangea 

 hortcnsk, Sm. Ic. Pict. t. 12, CurtyMag. t. 438. 



Sempervlrens, evergreen, permanent through one, 

 two, or more winters, .so that the bi'anches are 

 never stripped, as the Ivy, the Fir, the Cherry 

 Laurel, the Bav, &c. 



Declduwn, deciduous, falling off at the approach of 

 winter, as in most European trees and shrubs. 



Alienatum, f. 101, alienated, when the first leaves 



