Scientific and applied pharmacognosy intended for the use of students in pharmacy, as a hand book for pharmacists, and as a reference book for food and drug analysts and pharmacologists . Linum.—Linseed or Flaxseed.—The seed of Linum usitatissi-mum (Fam. Linacese), an annual, which is cultivated in nearly alltemperate and tropical regions, either for the fiber (flax) or seed. Description.—Anatropous, ovid or oblong-lanceolate, flattened,somewhat less rounded on one side and on one margin, summit acuteor beaked, chalazal end rounded, plano-convex in cross-section;from 4 to 5 mm. in length, 2 to
Scientific and applied pharmacognosy intended for the use of students in pharmacy, as a hand book for pharmacists, and as a reference book for food and drug analysts and pharmacologists . Linum.—Linseed or Flaxseed.—The seed of Linum usitatissi-mum (Fam. Linacese), an annual, which is cultivated in nearly alltemperate and tropical regions, either for the fiber (flax) or seed. Description.—Anatropous, ovid or oblong-lanceolate, flattened,somewhat less rounded on one side and on one margin, summit acuteor beaked, chalazal end rounded, plano-convex in cross-section;from 4 to 5 mm. in length, 2 to mm. in breadth, to thickness; externally light brown, very smooth and glossy, theraphe extending as a distinct, light yellow ridge along one edge,outer wall of epidermal cells transparent, mucilaginous and swellingin water; easily cut; endosperm white, adhering to the seed-coat,embryo light green, straight, 3 to 4 mm. in length, 1 to 2 mm. inbreadth, cotyledons plano-convex; odor slight; taste mucilaginousand slightly unpleasant. Inner Structure.—(Fig. 152). A thin mucilaginous epidermis;two layers of parenchyma which overlie a continuous ring of stone-. Fig. 152.—Transverse section of flaxseed: E, epidermal cells with small luminaand very thick outer wall showing mucilage lamellae; PY, PO, parenchymacells; ST, stone cells; P, parenchyma beneath stone cells; 0, obliteratedcells; CO, cells with reddish-brown contents; EN, endosperm. cells having yellowish, porous walls and rather large lumina; apigment layer, the cells having a reddish-brown content; endosperm FLAXSEED 351 consisting of from 6 to 10 rows of cells, surrounding the two largeplano-convex cotyledons; the cells of both the endosperm and thecotyledons contain a fixed oil and aleurone grains, the latter beingfrom to mm. in diameter. Linseed or Flaxseed Meal.—(Fig. 153.) Lemon-yellow; frag-ments of seed-coat with mucilaginous epidermal cells; sub-epidermaltissue composed of tw
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1920
