. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. of the margins of leaves,like their forms, are interesting because they areintimately related to the origin or • evolution of theparticular leaf (and, therefore, of the plant), andalso as a means of affording descriptive char-acters. The simple straight margin is said to beentire (Figs. 85, 102, 113, 114). Departures fromthis form are the serrate, or saw-toothed (Fig. 91);dentate, or toothed (Figs. 79, 80, 115, the lastbeing, perhaps, intermediate between serrate anddentate); crenate, or scal
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. of the margins of leaves,like their forms, are interesting because they areintimately related to the origin or • evolution of theparticular leaf (and, therefore, of the plant), andalso as a means of affording descriptive char-acters. The simple straight margin is said to beentire (Figs. 85, 102, 113, 114). Departures fromthis form are the serrate, or saw-toothed (Fig. 91);dentate, or toothed (Figs. 79, 80, 115, the lastbeing, perhaps, intermediate between serrate anddentate); crenate, or scalloped (Fig. 116); repand,or wavy, or undulate (Fig. 112 is obscurely so);sinuate, which is a deep undulation; and thenfollow the deep margins, as cut, jagged, lobed,cleft, and the like, to which we have alreadygiven attention (104c). 133(1. The diagrams of forms and margins of leaves given byLinneeus are reproduced in exact form and size in Fig. 117: 1,orbiculate; 2, sub-orbioulate (or subrotundate); 3, ovate; 4, oval,or elliptical; 5, oblong; 6, lanceolate [narrower than present bot- f s- ^- r. 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-
Size: 1428px × 1750px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
