A companion to the United States pharmacopia; . re generally some-what less thick than the pieces of root. Externally brown. Has fine wrinkles lengthwise. Has no deep fissures. Shows thin. Bark always brown or darker than thewood. Stem frequently splits longitudinally. Woody portion always more or lesstough. Either has a plain pith, or is hollow inthe center. Taste slightly or scarcely bitter. UNITED STATES PHARMACOPCEIA. 1G1 The root of Apocynum cannabinum has a reddish-brown cambiumline between bark and wood. In the stem this is also the case, and asimilar brown line separates the
A companion to the United States pharmacopia; . re generally some-what less thick than the pieces of root. Externally brown. Has fine wrinkles lengthwise. Has no deep fissures. Shows thin. Bark always brown or darker than thewood. Stem frequently splits longitudinally. Woody portion always more or lesstough. Either has a plain pith, or is hollow inthe center. Taste slightly or scarcely bitter. UNITED STATES PHARMACOPCEIA. 1G1 The root of Apocynum cannabinum has a reddish-brown cambiumline between bark and wood. In the stem this is also the case, and asimilar brown line separates the woody ring of the stem from its thin corky layer of the bark of both root and stem sometimes chipsoff in large blotches. When thoroughly dry the root breaks readilywith an abrupt fracture ; but when not dry it bends before breaking. Often the bulk of the drug consists of pieces of stem, usually ofsmaller diameter than the accompanying pieces of root. In its interiorthe bark of the root varies from nearly white to dark brown. Old dark-. Figs. 55-57.—Apocynum cannabinum. Transverse sections: a, of root, natural size,dry; b% of root, enlarged, by reflected light, after soaking in water ; c, of root, enlarged, bytransmitted light, after removal of cell-contents by caustic lye. colored bark has plainly visible resin ducts, and sometimes a glisteningfracture. The medullary rays of the wood are continued into the inner bark,and the large vessels in the woody portion are more or less concentri-cally arranged, while the resin ducts or laticiferous vessels in the barkare scattered. In illustrating the general appearance of the two drugs, the pieceswere purposely selected so as to show the close resemblance between theroots, the only obvious differences being in the relative thicknesses andthe color of their barks. Differences between the root of Apocynum cannabinum and the rootof Apocynum androsazmifolium: Root of A. cannabinum. Diameter generally averages seven mil-limeters (
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishernewyo, bookyear1884
