48 



FIRST LESSONS WITH PLANTS 



anists define lanceolate to be]; 7, linear; 8, sabulate [awl-like]; 

 9, reniform; 10, cordate; 11, lunulate [or crescent - shaped] ; 12, tri- 

 angular; 13, sagittate; 14, cordate -sagittate; 15, hastate; 16, cleft 

 ["fissum," now called obcordate] ; 17, three-lobed, or trilobate; IS, 

 preinorse [irregularly notched at the end]; 19, lobod, or lobate; 20, 

 five-angled; 21, erose [jagged or bitten]; 22, palmate; 23, pinnati- 



fid; 24, laciniate; 25, sinuate; 26, 

 dentate -sinuate; 27, retrorse- sinu- 

 ate ; 28, parted ; 29, repand ; 30, 

 dentate; 31, serrate; 32, doubly- 



FIG. 41. 

 Variation in birch leaves from the same tree. 



serrate; 33, doubly-crenate ; 34, cartilaginous; 35, acutely-erenate ; 

 36, obtusely-crenate ; 37, plicate ; 38, crenate ; 39, crisped ; 40, ob- 

 tuse ; 41, acute ; 42, acuminate, ; 43, obtusely -acuminate ; 44, emar- 

 ginate acute. 



SUGGESTIONS. Let the pupil cut the form of any leaf in paper, 

 and then endeavor to match it in other leaves. He will discover 

 how difficult it is to describe a leaf with accuracy, and will also 

 apprehend the greater truth that there are no two leaves alike. 



