. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. EXTERNAL CHARACTERISTICS 209 (See that right at the axils; such leaves are called sessile. Figure 72.) Sessile leaves often embrace the stems is, their blades extend some- what below the point of at- tachment ; such leaves are said to be clasping. This de- velopment of the bases of the leaf blades along the sides of the stem sometimes completely covers the stem. The leaves are then said to be sheathing. Corn is a plant whose leaf bases completely sheathe t
. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. EXTERNAL CHARACTERISTICS 209 (See that right at the axils; such leaves are called sessile. Figure 72.) Sessile leaves often embrace the stems is, their blades extend some- what below the point of at- tachment ; such leaves are said to be clasping. This de- velopment of the bases of the leaf blades along the sides of the stem sometimes completely covers the stem. The leaves are then said to be sheathing. Corn is a plant whose leaf bases completely sheathe the stem. The attachment of leaves and the length of their petioles often have a good deal to do with the relation of the leaves to light. Leaves are attached to stems singly, or in pairs, or in clusters, but, whatever the method, one principle appears to be observed by all. That principle is the avoidance of getting in each other's light. A leaf which is shaded by another leaf has its photo- synthesis much reduced, and, if the light has to pass through two leaves first, it has been noted that no photosynthesis „ r J Fig. 72. — Phlox, showing opposite OCCUrS at all. and sessile 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 G. (John Gaylord), b. 1876. New York, American Book Co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
