. A textbook of botany for colleges and universities ... Botany. LEAVES 575 of the rose (see figs. 1094-1096 and adjoining text). It is conceivable that the influence of gall insects upon hair production is essentially comparable to that of xerophytic factors, especially if the insects introduce osmotically active substances into the plant (see p. 785).. Figs. 821 822.—-Variation in Polygonum amphibium: 821, a branch from the aquatic form with floating leaves borne on a, submersed stem; note the lax horizontal stem, the smooth leaves, and the inconspicuous stipules (o); this represents the &qu
. A textbook of botany for colleges and universities ... Botany. LEAVES 575 of the rose (see figs. 1094-1096 and adjoining text). It is conceivable that the influence of gall insects upon hair production is essentially comparable to that of xerophytic factors, especially if the insects introduce osmotically active substances into the plant (see p. 785).. Figs. 821 822.—-Variation in Polygonum amphibium: 821, a branch from the aquatic form with floating leaves borne on a, submersed stem; note the lax horizontal stem, the smooth leaves, and the inconspicuous stipules (o); this represents the "typical" P. amphibium; 822, a branch from the land form (often erroneously called P. Hart- wrigMii); note the stout, erect emersed stem, the stiff hairy leaves, and the prominent sheathing stipules (0). Whatever may be the influence of desiccation or of insect activity upon hair production, neither these nor other external influences appear to modify hair form to any great extent. In most species the shape and structure of the hairs seem inherent, external factors determining only their presence or their absence. In. 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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