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 . Fig. 243.—Plants from 300 large belladonna seeds seven weeks after sowing,showing the unequal development of seedlings.—After Sievers, Amer. , 1914, p. 494. Inner Structure.—(Fig. 245.) Leaves bifacial; both the lowerand upper epidermis consist of cells, having thin undulate walls,stomata and hairs, these latter being more abundant on the dorsalsurface; a layer of short palisade cells; a crystal la
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 . Fig. 243.—Plants from 300 large belladonna seeds seven weeks after sowing,showing the unequal development of seedlings.—After Sievers, Amer. , 1914, p. 494. Inner Structure.—(Fig. 245.) Leaves bifacial; both the lowerand upper epidermis consist of cells, having thin undulate walls,stomata and hairs, these latter being more abundant on the dorsalsurface; a layer of short palisade cells; a crystal layer composed ofparenchyma, the nearly isodiametric cells being filled with sphenoidalmicrocrystals; several layers of loose mesophyll, among which are BELLADONNA 583 included the bicollateral fibre-vascular bundles occurring in the veins;non-glandular hairs, uniseriate, consisting of from 2 to 5 cells; gland-ular hairs of 2 types: (a), having a 2-to 3-celled stalk and a 1-celled-secreting head; (6), having a 1-celled stalk and 4- to 10-celled secret-ing head. It has been variously stated that calcium oxalate also. Fig. 244.—Atropa Belladonna; first years plant, grown at The H. K. MulfordCo. Drug Farm, Glenolden, Pa.—After Borneman, Amer. Jour. Pharm.,1912, p. 550. occurs in the leaves in the form of rosette aggregates and acicularcrystals. If true these forms are of very seldom occurrence. In the stem there occurs an outer epidermal layer having a thincuticle; a primary cortex of parenchyma, the cells being separatedby large intercellular spaces; an endodermis, beneath which in the 584 SCIENTIFIC AND APPLIED PHARMACOGNOSY pericycle occurs an interrupted circle of bast fibers occurring eithersingle or in small groups, the walls of which are relatively thin andslightly lignified (Fig. 245); a few layers of leptome; xylem con-sisting of a few tracheae associated with numerous wood fibers (); an internal phloem having small isolated groups of bast fibers
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