. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Fig. diagrams of leaves. 1751. THE FORMS OF LEA VES 121 anists define lanceolate to be]; 7, linear; 8, subulate [awl-like];9, reniform; 10, cordate; 11, luuulate [or crescent-shaped]; 12, tri-angular; 13, sagittate; 14, cordate-sagittate; 15, hastate; 16, cleft[fissum, now called obcordate] ; 17, three-lobed, or trilobate; 18,premorse [irregularly notched at the end]; 19, lobed, or lobate; 20,five-angled; 21, erose [jagged or bitten]; 22, palmate; 23, pinnati- fid; 24, laciniate
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Fig. diagrams of leaves. 1751. THE FORMS OF LEA VES 121 anists define lanceolate to be]; 7, linear; 8, subulate [awl-like];9, reniform; 10, cordate; 11, luuulate [or crescent-shaped]; 12, tri-angular; 13, sagittate; 14, cordate-sagittate; 15, hastate; 16, cleft[fissum, now called obcordate] ; 17, three-lobed, or trilobate; 18,premorse [irregularly notched at the end]; 19, lobed, 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. in birch leaves. serrate; 33, doubly - crenate; 34, cartilaginous; 35, acutely-erenate;36, obtusely-crenate; 37, plicate; 38, erenate; 39, crisped; 40, ob-tuse; 41, acute; 42, acuminate; 43, obtusely - acuminate; 44, emar-ginate acute. Suggestions.—We have said (127) that the forms of leaves aredescribed by comparing them with purely arbitrary measures. Weshould not expect them always to match these measures; in illus-tration of which, let the pupil cut the form of any leaf in paper. 122 LSSSOJVS WITS PLANTS and then endeavor to match it in other leaves. He will soondiscover how difficult it is to describe a leaf with accuracy, andhe will also apprehend the greater truth that there are probablynot two leaves alike. XXII. VARIATION IN PLANT, AND ONTHE SAME KIND
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
