INTRODUCTORY LESSONS. 



xvn 



"which becomes reniform if the apex, is rounded, etc. Ohovate ; Oblance- 

 olate ; Obcordate, etc., apply to forms the reverse of ovate, lanceolate, etc. 



25 26 



27 28 29 30 



Forms of Leaves. — 25. Lanceolate, 

 shaped). 29. Cordite (Heart-shaped), 

 shaped'. 3 2. Hastate (Spear-shaped) . 32a. Aiiriculate (Eared) base 



31 32 33a 



23. Oblanceolate. 27. SpaUilate. 28. Ovate (Egg- 

 30. Reniforin_( Kidney-shaped). 31. Falcate (Sickie- 



Apexes of Leaves. There are terms descriptive of the apexes (the 

 upper ends) of leaves. Fig. 18 has a Cuspidate apex; Fig. 19, Notched or 

 Emarginate ; Figures 23, 24, 29, Acute; Fig. 25, Acuminate; Fig. 26, 

 Obtuse. 



Margins of Leaves. All these forms are represented as having 



Leaf IMargins.— 3 3 . Serrate. 34. Dentate. 35. Crenate. 36- Wavy. 37. Sinuate. 38. Incised. 

 39. Erose. 



entire or nearly entire margins, but the margins may be notched or cut 

 in various ways. Figures 33 to 39 will assist you in describing the mar- 

 gins of 3'our leaves. Here, also, yo\x will find it necessary to combine ad- 



