. Botany for high schools and colleges. Botany. INTERNAL STRUCTUBE OF LEAVES. 157 204.—Another curious leaf structure is to be seen in Stipa spartea, the Porcupine Grass of the interior ; each long harsh leaf is longi- tudinally channel- led on its upper surface, which, by the twisting of the basal portion of the leaf, becomes apparently the low- er, and the chlo- rophyll-bearing pa- renchyma is con- fined to the sides of tlie channels (Figs. 135 and 136). At the bottom of each channel the epider- mal cells are pe- culiarly developed into a hygroscopic tissue, which, by contracting, closes the
. Botany for high schools and colleges. Botany. INTERNAL STRUCTUBE OF LEAVES. 157 204.—Another curious leaf structure is to be seen in Stipa spartea, the Porcupine Grass of the interior ; each long harsh leaf is longi- tudinally channel- led on its upper surface, which, by the twisting of the basal portion of the leaf, becomes apparently the low- er, and the chlo- rophyll-bearing pa- renchyma is con- fined to the sides of tlie channels (Figs. 135 and 136). At the bottom of each channel the epider- mal cells are pe- culiarly developed into a hygroscopic tissue, which, by contracting, closes the channels and rolls the leaf to- gether, as always takes place in dry air. {a) Many Monocoty- ledons—as, for exam- ple, Iris and Indian nnvn ftflPriT-rl rtnr,A ot^o ^ig- 134.—Transverse section of the leaf of Silphium corn—y cd,reiuiiy lo^^r part of the leaf ; s, a Ptoma seen in transverse removing the outer section. X 235.—From a drawing by the author, leaves in succession all stages of leaf-development may be south—, with, the leaf-planes parallel to the plane of the meridian- see articles in the American Naturalist: 1870, p. 495; 1871, p, 1; 18?7, 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 Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
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