. A textbook of botany for colleges and universities ... Botany. S82 ECOLOGY are of significance in relation to transpiration, since the closely appressed leaves of desiccated individuals have a greatly reduced aggregate surface. Epinasty and hyponasty. — If a leaf exhibits curvatures by reason of greater growth at the upper surface, it is said to display epinasty, while if the greater growth is at the lower surface, it displays hyponasty. Various plants, as Juniperus (fig. 838) and Sempervivum, manifest hyponasty in the autumn, the erected leaves becoming closely appressed to the stem or to o
. A textbook of botany for colleges and universities ... Botany. S82 ECOLOGY are of significance in relation to transpiration, since the closely appressed leaves of desiccated individuals have a greatly reduced aggregate surface. Epinasty and hyponasty. — If a leaf exhibits curvatures by reason of greater growth at the upper surface, it is said to display epinasty, while if the greater growth is at the lower surface, it displays hyponasty. Various plants, as Juniperus (fig. 838) and Sempervivum, manifest hyponasty in the autumn, the erected leaves becoming closely appressed to the stem or to one another, while epinasty the fol- lowing spring results in leaf horizontality and increased surface exposure ( Figs. 838, 839. — Shoots of the juni- per {Juniperus communis), showing vary- ing leaf orientation: 838, a shoot as seen in winter; note the ascending or erect leaves, whose orientation probably is due to a preponderance of growth beneath (hyponasty); 839, a shoot as seen in sum- mer; note the spreading leaves, whose orientation probably is due to a pre- ponderance of growth above (epinasty).. 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
Size: 1488px × 1679px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
