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 . family of about 600 species of herbs, which are most abundantin temperate regions. The leaves are simple and usually opposite;the flowers are regular, and borne in terminal or axillary cymes; andthe fruit is a capsule. The plants of this family invariably containbitter principles. The primary cortex not infrequently containscollenchyma. A ring of sclerenchymatous tissues may or may notdevelop in the pericycle
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 . family of about 600 species of herbs, which are most abundantin temperate regions. The leaves are simple and usually opposite;the flowers are regular, and borne in terminal or axillary cymes; andthe fruit is a capsule. The plants of this family invariably containbitter principles. The primary cortex not infrequently containscollenchyma. A ring of sclerenchymatous tissues may or may notdevelop in the pericycle. Strands of interxylary phloem occur inGentiana, Erythraea and other genera. The walls of the tracheaepossess simple pores only. The wood fibers are marked usually bybordered pores. The medullary rays are very narrow and sometimesentirely wanting. The non-glandular hairs are unicellular. In theparenchyma cells throughout Menyanthes occur intercellularbranching hairs, having thick walls, which project into the inter-cellular spaces. At the margins of the leaves of Menyanthes therealso occur hydathodes, or water storing cells. Calcium oxalatecrystals are wanting. PHLOX CAROLINA 533. Fig. 228.—Phlox Carolina: A, lower portion of plant showing long roots withnumerous rootlets at the ends. B, parenchyma from cortex of rhizomeshowing two sclerotic cells (s). C, cross-section of portion of rhizome show-ing parenchyma of cortex (p) which contains protoplasm and starch grainsendodermis (e), leptome (s), tracheae (v), libriform (t), wood parenchyma(w), parenchyma of pith containing starch grains and protoplasm (pa).D, isolated sclerotic cells from cortex. E, tracheae having annular and spiralthickenings. F, libriform cells. G, glandular hair from the leaf. 534 SCIENTIFIC AND APPLIED PHARMACOGNOSY Gentiana.—Gentian.—The rhizome and roots of Gentianalutea (Fam. Gentianaceae), a perennial herb (Fig. 229) indigenous tocentral and southern Europe and Asia Minor. The fleshy rhizomesand
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1920
