. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. Fig. 190. — Narrow leaves in crowded vertical rows. bane and bitterweed {Helenium tenuifolium), illustrate this relation. On the other hand, when the leaves are large and rounded in outline, as those of the sunflower, hollyhock, and catalpa, they are usually separated by longer internodes, or their blades are cut and incised so that the sun- light easily strikes through to the lower ones. 170. Other external characteristics to be observed in leaves are: — whether round, ov
. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. Fig. 190. — Narrow leaves in crowded vertical rows. bane and bitterweed {Helenium tenuifolium), illustrate this relation. On the other hand, when the leaves are large and rounded in outline, as those of the sunflower, hollyhock, and catalpa, they are usually separated by longer internodes, or their blades are cut and incised so that the sun- light easily strikes through to the lower ones. 170. Other external characteristics to be observed in leaves are: — whether round, oval, heart-shaped, (1) General Outline etc. (Figs. 191-197). (2) Margins: whether unbroken (entire), or variously toothed and indented. (Figs. 198-202.). 195 196. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Andrews, Eliza Frances, b. 1840; Lloyd, Francis Ernest, 1868-1947. ed. New York, Cincinnati [etc. ] American book company
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