. Plants and their uses; an introduction to botany . (a, a) and finally produce fruit dots or sori on the back. j. 2, rootstock cut showing the woody vessels (a, a) through whichthe sap runs. 3, segment of the leaf, under side, showing sori or clustersof spore-cases (6) each cluster protected by a cover or indusiumia). sorus cut vertically across the indusium. -5, the same cut at rightangle to 4 through the leaf (a), much enlarged to show the indusium (6),and the spore-cases (c). 6, a discharging spores. (^Yos-sidlo.)—A perennial herb: leaves about .30-100 cm. long; fru
. Plants and their uses; an introduction to botany . (a, a) and finally produce fruit dots or sori on the back. j. 2, rootstock cut showing the woody vessels (a, a) through whichthe sap runs. 3, segment of the leaf, under side, showing sori or clustersof spore-cases (6) each cluster protected by a cover or indusiumia). sorus cut vertically across the indusium. -5, the same cut at rightangle to 4 through the leaf (a), much enlarged to show the indusium (6),and the spore-cases (c). 6, a discharging spores. (^Yos-sidlo.)—A perennial herb: leaves about .30-100 cm. long; fruit dotsbrownish. Native home, Northern Europe and North -America. 180 MEDICINAL AND POISONOUS PLANTS from the circumstance that they are commonly associatedin plants with volatile oils it is supj^osed that they are derivedfrom the latter by oxitlation; but they arc often complexmixtures of obscure chemical composition. Comparativelyfew resins are poisonous, and of these, only those containedin the drugs called male-fern and Indian hemp need here. Fig. 171, I.—Indian Hemp (Caniuibis nulini. Mulberry Family, Moracece).Staminate and pistillate plants. (Baillon.)—. annual 1-3 m. tall;leaves roughish, flowers greenish; fruit dry. Native home, CentralAsia. concern us. It is the dried and pulverized underground stemof the male-fern (Fig. 170) and related species which con-stitutes the drug long known as a most valuable means ofexpelling tapeworms. The resin, which is the active con-stituent, has proved, however, in overdoses to be a violent POISONOUS DRUGS 181 poison. Tho resin of Indian hemp (Fig. 171) is obtainedchiefly from the pistillate flower-clusters and fruits. Underthe name of hashish resinous parts of the plant are smokedas an intoxicant by Eastern peoples. IMedicinall} the drugis used for its quieting efi^ect upon the nerves in certain dis-eased conditions. It is highly injurious when taken in over-doses, and terrible effects follows its habitual use as an in-toxicant
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
