ASTERACE.2E. 



PYRETHRUM. 



Head many-flowered, heterogamous. Florets of the ray in 

 1 row, $ , ligulate, very rarely wanting ; of the disk tubular, $f , 

 5-toothed ; the tube usually obcompressed and 2-winged, rarely 

 nearly round. Involucre imbricated, campanulate, with the 

 scales scarious at the edge. Receptacle flat or convex, naked, 

 or occasionally bracteolate when the heads are flat. Style of 

 the disk with exappendiculate branches. Achaenia wingless, 

 angular, uniform, crowned by a coronetted pappus, which is 

 usually toothed, occasionally auriculate and as broad as the 

 achaenium. DC. 



930. P. Parthenium Smith Fl. Brit. 900. Eng.Bot. 1. 1231. 

 DC.prodr.vi. 58. Matricaria Parthenium Linn, sp.pl. 1255. 

 Woodv. t. 249. M. odorata Lam.Jl.fr. ii. 135. Common in 

 waste places in many parts of Europe. (Feverfew.) 



Root tapering. Stem erect, branched, leafy, round, furrowed, many- 

 flowered, about 2 feet high, or more, Leaves stalked, of a hoary 

 green, once or twice pinnate, or pinnatifid ; the leaflets, or segments, 

 inclining to ovate, decurrent, cut. Panicle corymbose, sometimes 

 compound; the peduncles long, naked, single-flowered, swelling up- 

 wards. Flower-heads erect, about | an inch broad, with a convex 

 yellow disk, and numerous short, broad, abrupt, 2-ribbed, white rays ; 

 often wanting ; sometimes multiplied, and, the disk being obliterated, 

 constituting a double flower. The achasnia are crowned with a short 

 membrane. The whole plant is bitter and strong-scented, reckoned 

 tonic, stimulating, and anti-hysteric. Smith. It was once a popular 

 remedy in ague. Its odour is said to be peculiarly disagreeable to bees, 

 and that these insects may be easily kept at a distance by carrying a 

 handful of the flower-heads. Burnett. 



ARTEMISIA. 



Heads discoidal, homogamous or heterogamous. Florets of 

 the ray in 1 row, usually ? and 3-toothed, with a long bifid 

 protruding style ; of the disk 5-toothed, $*, or by the abortion 

 of the ovary, neuter or $ . Involucral scales imbricated, dry, 

 scarious at the edge. Receptacle without paleae, flattish or con- 

 vex, naked or fringed with hairs. Achaenia obovate, bald, with 

 a minute epigynous disk. DC. 



* # * The species of this genus are generally bitter aromatic plants 

 and many of them have been used medicinally besides the following : 

 931, A. Judaica Linn.; 932, A. maritima Linn. ; 933, A. procera 

 Willd. ; 934-, A campestris Linn. ; 935, A. arborescens Linn. ; 936, 

 A. glacialis Linn.; 937, A. spicata Jacg.; 938, A. vallesiaca All.; and 

 939, A. rupestris Linn, have been particularly spoken of. 



940. A. indica Willd. iii. 1846. Bess. abr. n. 34. Roxb. fi. 

 ind. iii. 419. DC. prodr. vi. 114. Nepal, China, Japan. 



Stems several, shrubby, erect, sometimes biennial, branched, striated, 

 the tender parts villousj from 4 to 8 feet high. Leaves alternate, the 



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