. A manual of structural botany; an introductory textbook for students of science and pharmacy. Plant morphology. STliUCTlJliE OF rilE MONOCOTYLEDONOUS STEM 149 111 sonic stems the i)ith or medulla (lisii])])eiirs more or less eom- ])letely after a time, lea\'iiif^ a eylindrieal hollow cavity. This may be eontinuoiis throiif^h the nodes orse[)arated at those jjoiiits by transverse ])artitions. Structure of the Monocotyledonous Stem.âIn monoeotyledons (Fig. 121) we have the Closed bundle, in which the one element surrounds and encloses the other. In all medicinal monocotyledonous stems possessi
. A manual of structural botany; an introductory textbook for students of science and pharmacy. Plant morphology. STliUCTlJliE OF rilE MONOCOTYLEDONOUS STEM 149 111 sonic stems the i)ith or medulla (lisii])])eiirs more or less eom- ])letely after a time, lea\'iiif^ a eylindrieal hollow cavity. This may be eontinuoiis throiif^h the nodes orse[)arated at those jjoiiits by transverse ])artitions. Structure of the Monocotyledonous Stem.âIn monoeotyledons (Fig. 121) we have the Closed bundle, in which the one element surrounds and encloses the other. In all medicinal monocotyledonous stems possessing such bundles, it is the xyleni wiiich encl()S(>s the ])hloem. If the two cylinders thus formed have a connnon center, which form is not very common, it is called a Concentric bundle. It is clear that in the last two forms a cambium cylinder, such as distinguishes the stele, possessing the form i)re\i()usl>' considered, cannot be formed. In such. -a â 6 4H. l''if^. 424. TninHvorMo .si'i-linri of inonucut^lt^donouH wtrm: a, cloHcd buiullcy through piiren- oh>'iiin; /i, iiiicknis Hhi^ath, or I'luloduriiiiH. plants indefinite growth in thickness of the bundles obviously cannot occur, and the same is true of the entire stele, unless new bundles shall dexelop in it. Usually this does not occur, but if the upper portion of tlu> i)lant shall branch and continue to extend its leafy surface, meristem tissue will then fornr towiird the outer portion of the stele, and from this new bundles will suceessixcly arise, so that the thickness of the trunk will kee]) ])ace with the (>xtension of the crown, notwithstanding that the indixidual biuidles do not increase in thickness after the com- ])letion of their primary structure. In stems ])ossessing this form of bundles the hitter (Fig. 124, «.) are found more or less scattered through the fundamental or medullary tissue, though there is commonly more or less of a coneeutration of thcin in some one region, usuall
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1911
