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 . rthern countries of bothhemispheres. They possess simple leaves, regular and perfectflowers, capsular fruits, and are especially characterized by theirthick-walled, unicellular hairs, which are frequently united, formingstellate groups (Fig. 194). The glandular hairs are always uniseriate(Fig. 194). As pointed out by Holm the pericycle is a continuous ringincluding both sclereids and stereids, the former bein
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 . rthern countries of bothhemispheres. They possess simple leaves, regular and perfectflowers, capsular fruits, and are especially characterized by theirthick-walled, unicellular hairs, which are frequently united, formingstellate groups (Fig. 194). The glandular hairs are always uniseriate(Fig. 194). As pointed out by Holm the pericycle is a continuous ringincluding both sclereids and stereids, the former being in the natureof stone cells and the latter being in the nature of lignified scleren-chymatous fibers. The trachea? are provided with simple pores andpossess small lumina; the wood fibers have bordered pores; and themedullary rays are narrow. Calcium oxalate is secreted in the formof rosette aggregates. Helianthemum.—Frostweed, Frost-wort.—The over-groundplant of Helianthemum canadense (Fam. Cistacese) a low shrubgrowing in dry, sandy soil from Massachusetts to North stem portions, with leaves and flowers, are collected in summerand carefully dried. FROSTWEED 445. Fig. 194.—Helianthemum canadense: The plant produces two kinds of flowers,the normal or ephemeral, being terminal and having large yellow petals(A); and others that are very small, axillary and apetalous (B). C, one ofthe lanceolate leaves. D, a pistil from one of the normal flowers. E, anopen capsule developed from one of the normal flowers and enclosing anumber of small seeds. F, a capsule from one of the apetalous , section through one of the small seeds showing the curved embryo. H,transverse section of leaf: ep, epidermal cells of ventral surface; P, palisadecells; M, loose mesophyll; D, epidermal cells from the lower or dorsal sur-face. I, stellate hairs which are abundant on the dorsal surface of the leafand occur to some extent also on the ventral surface. K, one of the long-stalke
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1920
