318 LXXVITI. COMPOSITE. (J. D. Hooker.) [Tanacetum. 



men but Wallich's. Kurz is the authority for the Siam habitat. Bentham had not 

 seen it, or would never have confounded it with Centipeda orbicularis (C. minuta, 

 Benth., Myriogyne minuta, Less.), even generically. It is, however, generically allied 

 to that plant and to Dichrocephala, near which I think that both should be placed. 



71. TANACETUM, Linn. 



Annual or perennial herbs. Leaves usually pinnatisect. Heads corymbose 

 (rarely large, long-peduncled, and solitary), heterogamous or homogamous, 

 disciform, yellow ; outer fl. or $ , 1 -seriate, fertile, terete or compressed, 2-3- 

 fid ; disk-fl. $ , fertile, tube stout cylindric, limb 5-n'd. Involucre usually broad 

 and short ; bracts oo -seriate, appressed, margins often scarious and brown, outer 

 smaller. Receptacle flat or convex, naked. Anther-bases obtuse, entire. Style- 

 arms of ^ with truncate peuicillate tips. Achenes compressed, 5-angled or -ribbed, 

 or of the ray triquetrous, truncate ; pappus annular or corouiform or 0, rarely a 

 dimidiate auricle. DISTRIB. Species about 30, north temperate regions. 



* Leaves all cauline. and pinnatisect^ stems or branches all flowering. 



1. T. fruticulosum, Ledeb. Fl. Alt. iv. 58 ; Ic. t. 38 ; hoary or woolly, 

 stems ver} r many from the woody root 10-14 in. strict erect leafy upwards, leaves 

 |- in. 1-2-pinnatisect, segments spreading linear obtuse, heads many peduncled 

 or sessile in. diam., invol. bracts broadly oblong nearly glabrous all scarious and 

 pale or margins faintly coloured, receptacle conic. DC. Prodr. vi. 129. Py- 

 rethrum Athanasia, Bess. ; Boiss. Fl. Orient, iii. 353. 



WESTERN TIBET, alt. 12-15,000 ft., Thomson, &c. DISTRIB. Altai Mts., Aff- 

 ghanistan. 



Root as thick as the thumb and less ; stems rather slender. Heads numerous. 

 Achenes, ripe not seen. The species is easily confounded with Artemisia, fascicidat a ; it 

 differs from T. artemisioides in the narrower leaf-segments and glabrous involucre, 

 from A. gracile in habit and the much larger heads. 



2. T. artemisioides, Schultz-Bip. in Herb. Hook. ; hoary-pubescent, 

 stem 1-2 ft. slender naked below sparsely leafy ribbed simple or corymbosely 

 branched above, leaves -1 in. subpalmately 1-2-pinuatisect, segments short 

 broad obtuse, heads \ in. in small corymbs terminating very long slender 

 branches, invol. bracts broadly oblong concave coriaceous pubescent wholly pale, 

 receptacle conical. Artemisia fasciculata, Herb. Ind. Or. H. f. fy T. ; Clarke 

 Comp. Ind. 162, not of M. Bieb. 



WESTERN TIBET; Balti, alt. 8-9000 ft., Thomson. 



Stems sometimes simple, at others copiously branched from the base; the branches 

 all long, slender, and sparsely leafy, both angled and ribbed, greenish grey. Heads 

 sessile in a cluster, or peduncled and forming a small flat-topped or rounded corymb 

 rarely 1 in. diam. ; flowers about 20 ; receptacle conic. Achenes, ripe not seen. \ 



3. T. gracile, Hook. f. fy Thorns. ; hoary-pubescent, stems many from a 

 woody stock very slender 1-2 ft. corymbosely branched above, branches slender 

 spreading, leaves ^-1 in. few scattered palmately 2-pinnatisect, segments very 

 slender, heads ^ in. diam. in small corymbs terminating the long slender branches, 

 invol. bracts broadly oblong scarious glabrous pale, receptacJe conical, achenes 

 obovoid with a terminal cupula. T. fruticulosum, Clarke Comp. Ind. 153. 



WESTERN TIBET, Falconer; Ladak, alt. 11-12,000 ft., Thomson; Sutlej river, N. of 

 Kumaon, alt. 13,500 ft., Strach. $ Winterb. 



This is very near T. artemisioides, but is much more slender, with slender leaf- 

 segments and much smaller heads, with glabrous invol. bracts. 



4. T. nubig-enum, Watt, in DC. Prodr. vi. 130; hoary or woolly, stems 



