. Plant studies; an elementary botany. Botany. Fk;. 334. Section across a young twig of bos elder, showing the four stem regions: â¬, epidermis, represented by the heavy bounding line; c, cortex: w, vascular cyl- inder; p, pith.âFrom "Plant Relations.'' eter of woody stems (Fig. .')o5, «'), and a possiblo increase of the braneli and foliage dis- jilay eacli year. (:)) Leaf veins foriu- ing an open system (Fig. 333, figure to riglit). The network of smaller veinlets lietween the larger veins is usually very evident, esjieeially on the under surface of the leaf, suggesting the name
. Plant studies; an elementary botany. Botany. Fk;. 334. Section across a young twig of bos elder, showing the four stem regions: â¬, epidermis, represented by the heavy bounding line; c, cortex: w, vascular cyl- inder; p, pith.âFrom "Plant Relations.'' eter of woody stems (Fig. .')o5, «'), and a possiblo increase of the braneli and foliage dis- jilay eacli year. (:)) Leaf veins foriu- ing an open system (Fig. 333, figure to riglit). The network of smaller veinlets lietween the larger veins is usually very evident, esjieeially on the under surface of the leaf, suggesting the name "n e t - v e i n e d ' leaves, in contrast to the " parallel-veined " leaves of Mono- cotyledons. The vein system ends freely in the margin of tlie leaf, forming an " open ; In consequence of this, altliough the leaf may remain entire, it very commonly be- comes toothed, lobed, anil divided in various ways. Two main types of venation may be noted, wliieli influence the form of leaves. In one case a siii,2;le very prominent vein (///') runs through the mid- dle of the blade, and is called tlie niidriJi. From tliis all the mi- nor veins arise as branches (l''ig. â >,!(;), adid such a k'af is said. tliRT y(.':irs did, show ii LT IliHT annn il riiiLTS, or Lz:ro\vtti ririLi:s, in Itic \ aM'iil;ir cylin Ut; tlie radialiTiij; liiu\« [iii) \\ li eh rrns,^ thr vascnlar r('i;inii i)!') ri'iircsriil tin pidi ray,^, tli ' jirinci- ji;il onos fxtnuliiiix fro n (hr pith to thr cor- tex ((â ). âKmiii 'â Plant I .<';^.^^. 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
