. Plant studies; an elementary botany. Botany. u PLAKT STUDIES ally arranged in a delinite nnmber of vertical rows. It is to the advantage of tlie plant for tliese leaves to sliade one another as little as p(jssible. Therefore^ the narrower the leaves, the more nuniei'ous may be the vortical rows (see Figs. 7. s) : and ^ the broader the leaves tlie fewer tlie verti(-al rows (see Fig. 1). A relation exists, t h e r e f o re. b e - tween thcl)readth of leaves and the nnndjer of verti- cal rows, and the meaning of this becomes plain when the light-re- lation is consid- ered. IS. Relation of lengt
. Plant studies; an elementary botany. Botany. u PLAKT STUDIES ally arranged in a delinite nnmber of vertical rows. It is to the advantage of tlie plant for tliese leaves to sliade one another as little as p(jssible. Therefore^ the narrower the leaves, the more nuniei'ous may be the vortical rows (see Figs. 7. s) : and ^ the broader the leaves tlie fewer tlie verti(-al rows (see Fig. 1). A relation exists, t h e r e f o re. b e - tween thcl)readth of leaves and the nnndjer of verti- cal rows, and the meaning of this becomes plain when the light-re- lation is consid- ered. IS. Relation of length to the dis- tance between leaves of the same row.—Tlic leaves in a. vci'tical row may Ije close togtfhcr or far ajiart. If they should lie close together at the same time hmg. it is evident that they will shade each other consideraldy, as tlie light cannot well strike in between them and reacli tlic snrface of the lower leaf. Therefore, flu; (closer together the Icavi's of a verti- cal row, the shorter are the leaves ; and tlic farllicr apart the leaves of a row. ilie longer iiiav thev be. ShdiM leaves permit the light to strike between thcni even if llicv arc close together on the stem ; and long leaves permit the same thing only when tliey are apart on the stem. A. Fig. 7. An lily, showing narrow Icavc's and numerous vertical 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. New York, D. Appleton and Company
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