FORMS OF SIMPLE LEAVES. 



OBTUSK. 



Fig. 21. 



EMARGINATE 



An a'ctrose leaf (from the Latin, acer, a needle), 

 in the form of a needle, is seen on pines ; it is linear 

 acuminate. 



An obtuse leaf folium obtusnm (fig* 19), blunt 

 pointed ; the apex is broader than the base, and forms 

 the segment of a circle. The primrose has a leaf of 

 this kind. ' 



An obcordate leaf folium obcordatum (fg. 20). 

 The Latin word ob is prefixed to technical terms, 

 to indicate that a thing is inverted : obcordate means 

 inversely cordate (see Jig. 51), the notch being at 

 the apex instead of the base of the leaf. Example: 

 the Oxalis acetosella, sheep-sorrel. 



An ema'rginate leaf folivm emarginatum (Jig. 

 21). Ernarginate (from the Latin, e, from, and 

 margo, margin, or edge), notched. Having a notch 

 at the end. Example : the Geranium emarginatum. 



When the notch or sinus is very obtuse, it is said 

 to be refuse, or almost emarginate. 



A lanceolate leaf 

 folium Innceolatum (fig. 

 22) lance-shaped, as in 



the olive. Narrowly ob- Fig. 22. LANCEOLATE. 



long and tapering to each 

 end. The peach tree has leaves of this description. 



An acute leaf folium 

 acutum ( fig. 23). Sharp 

 pointed. Terminating in 

 nn acute point without Fi^. 23. ACUTE. 



tapering suddenly. The Solidago odora, an aromatic plant, i* 

 an instance. 



tum(fg. 24). (From the Ftg. 24. SETACKO-ACUMINATE. 



Latin, seta, a bristle.) The point of the leaf terminated by a 

 straight bristle-like projection. The Quercus phellos, willow- 

 .eaved oak, is an example. Leaves are 



Mucronate (from the Latin, mucro, in *he genitive, mucronis, 

 a sharp point), when an obtuse leaf terminates in a short, rigid 

 point, formed by the projection of the miclrib. 



Cuspidate (from the Latin, cuspis, the point of a spear or 

 other weapon), when it is more gradually prolonged into a rigid 

 point. 



Pungent, when it tei minates in a hard sharp point, like thp 

 eaves of thistles. 



