. A textbook of botany for colleges and universities ... Botany. Fig. 641. — Enlarged details of spiral {$), pitted (p), and reticulate (r) tracheae; at i, traces of original partition walls. — Adapted from Haberlandt and TscHIRCH. ones. When numerous primary and secondary strands are produced, they may form a column of xylem, with pith in the center, interrupted by thin radiating plates of parenchyma, the. pith rays. Such is the condition in the sun- flower, castor bean (fig. 644), and many other dicotyledons. In case the xylem strands do not undergo individual secondary thickening (as is the
. A textbook of botany for colleges and universities ... Botany. Fig. 641. — Enlarged details of spiral {$), pitted (p), and reticulate (r) tracheae; at i, traces of original partition walls. — Adapted from Haberlandt and TscHIRCH. ones. When numerous primary and secondary strands are produced, they may form a column of xylem, with pith in the center, interrupted by thin radiating plates of parenchyma, the. pith rays. Such is the condition in the sun- flower, castor bean (fig. 644), and many other dicotyledons. In case the xylem strands do not undergo individual secondary thickening (as is the case in most monocoty- ledons), there may be a cylinder of meristem which repeatedly produces new bundles, as in asparagus. But in all plants which produce numerous leaves the increasing evaporation is Fig. 642. — Young vas- cular bundle: p, primary phloem ; x^ primary xylem ; c, iirst divisions of cambium cells.—After Bonnier. 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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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
