. A textbook of botany for colleges and universities ... Botany. 6o2 ECOLOGY light and carbon dioxid for synthesis. In the xerophytic leaf there is a relatively large amount of cell division parallel to the surface,. Figs. 876-879. — Leaf variation in Geum virginianum ; 876, a basal leaf from a winter rosette; 877, a higher leaf from a winter rosette; 878, a leaf from the lower part of a stem; 879, a leaf from the upper part of a stem. resulting in dorsiventral enlargement, while in the mesoph3ftic leaf, sur- face enlargement results from the extensive lateral development of the individual cel
. A textbook of botany for colleges and universities ... Botany. 6o2 ECOLOGY light and carbon dioxid for synthesis. In the xerophytic leaf there is a relatively large amount of cell division parallel to the surface,. Figs. 876-879. — Leaf variation in Geum virginianum ; 876, a basal leaf from a winter rosette; 877, a higher leaf from a winter rosette; 878, a leaf from the lower part of a stem; 879, a leaf from the upper part of a stem. resulting in dorsiventral enlargement, while in the mesoph3ftic leaf, sur- face enlargement results from the extensive lateral development of the individual cells sup- plemented some- times by an increased number of cell divi- sions perpendicular to the surface. Variation in the leaf contour of land plants.—The hare- bell (Campanula rotundifolia) has a basal rosette of peti- oled, round, or ovate leaves, while the up- per stem leaves are narrowly lanceolate or even linear (figs. 871, 872). Early experiments related these leaf variations to light, the large basal being thought to result from shade or diffuse light, and the narrow upper leaves from intense light. However, the basal leaves are. 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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