American journal of pharmacy . TERISTICS. Parthenium hysteroi)horous is a composite plant, sub-orderTubulifcra, with radiate heads, pistillate rays and sterile disc is a pubescent annual, having diffuse stem, pinnatifid leaves, withlinear toothed lobes and {)r()minent nervature (Prontisf>iece). (169) I/O Parthenium Hysterophorous. {^^llxiiXm^.^ Its heads are loosely panicled with involucre of five ovate scales,arranged in two rows, (Fig. i). There are in each head five rayflorets in a single row, each resting within an oval chaffy scale whichis hairy above, and which, on separati
American journal of pharmacy . TERISTICS. Parthenium hysteroi)horous is a composite plant, sub-orderTubulifcra, with radiate heads, pistillate rays and sterile disc is a pubescent annual, having diffuse stem, pinnatifid leaves, withlinear toothed lobes and {)r()minent nervature (Prontisf>iece). (169) I/O Parthenium Hysterophorous. {^^llxiiXm^.^ Its heads are loosely panicled with involucre of five ovate scales,arranged in two rows, (Fig. i). There are in each head five rayflorets in a single row, each resting within an oval chaffy scale whichis hairy above, and which, on separating, usually divide in threeportions. The ray florets are short, pistillate, ripening to smooth,compressed achenia, with pappus composed of oval scales {Fig. 2). The disc florets are tubular, five-toothed and sterile, having syn-genesious anthers producing pollen grains, which are prickled simi-larly to those of malva. Those nearest the ray florets are attached inpairs to each of the chaffy scales mentioned above {Fig. j). Each. Fig. I. Parthenium Hysterophorous. Outer involucre, magnified twentydiameters. inner floret has its own chaffy scale, which is more narrow thanthose on the outer rim. The receptacle is conical and not veryprominent. The plant commonly called Bastard Feverfew grows in the WestIndies (where it is known as Escoba amargo), in Florida and inLouisiana. It has been introduced in Europe as Absinthe sauvagedes Antilles. It attains the height of three feet, possesses a peculiarheavy odor, while the leaves and flowers have an intensely bittertaste. The anatomy of the active part of Parthenium hysterophorous issimple. The chaff is composed of longitudinally elongated cells in Am. Jour. Pharnj. April, 18OT. Partheniu m Hysterophoroiis. 171 single layers, through which pass branching fibro-vascular bundles,the prominent constituent of which are spiral ducts. The scalesterminate in a mass of hairs composed of two to four cells, of whichthe terminal one is the largest.
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