36 



A SYNOPSIS OF THE VEGETABLE KINGDOM. 



7. riELENiUM Tribe. 



A. InvoUioral bracts united 

 nearly througboiit into 

 an oMong cup or tube.. . .89. Tagetes. 

 (See also Lasthenia.) 

 AA. InvoUicral bracts hardly at 

 a 1 1 imbricated ; when 

 broad nearly equal or in 



1 series 



B. Receptacle mostly high- 

 conical, and acute. 

 beset after the akenes 

 have fallen by project- 

 ing points (as if pe- 

 dicels on which they 



were inserted) 



c. The involucre a single 

 series of bracts con- 

 nate by their edges 

 into a 5-15-toothed 



green cup OO. Lasthema. 



cc. The involucre of loose. 



distinct bracts !)1. B.eria. 



(Including Actinolepis coronaria.) 

 BB. Receptacle flat or convex, 

 rarely obtusely coni- 

 cal : akenes from linear 

 to obpyramidal. rarely 

 5-angled. See also 



BBB 



c. Herbage mostly woolly : 

 Involucral bracts 

 erect not membran- 

 ous ^-- Ekiophyllum. 



cc. Herbage usually not 



woolly 



D. Disc fls. deeply 5- 

 cleft : involucral 

 bracts mostly ap- 



pressed 93. Polypteris. 



DD. Disc fls. with long 

 and narrow throat 

 and 5 short lobes 



or teeth 



E. Akenes merely pube- 

 scent 94. CHiENACTIS. 



EE. Akenes villous 95. Hulsea. 



BBB. Receptacle from convex 

 to oblong : akenes short, 

 obpyramidal or top- 

 shaped, 5-10-ribbed or 

 angled, mostly silky 

 hairv : disc fls. all fer- 

 tile 



c. The receptacle destitute 

 of awn-like fimbrillae 



among the fls 4 



D. Involucre erect or 



nearly so 96. Actinella. 



DD. Involucre spreading 



or soon reflexed . . . 97. Helexiu.m. 

 cc. The receptacle beset 

 with bristle-like or 

 awl-shaped or rarely 

 dentiform fimbrillre 

 among the fls 98. Gaillardia. 



8. Antiie.mis Tribe. 



. Receptacle chaffy 



B. Heads usually discoid. . . 



c. Corolla with a hood 



like appendage 



at 



..0 



such 



.99. Santolixa. 



cc. Corolla without 



appendage 100. Lonas. 



BB. Heads usually radiate. . . 

 c. Akene compressed, with 



2 narrow margins. ..101. Achillea. 

 cc. Akenes 4-5-cornered or 



00 -ribbed 



D. Heads peduncled at 



tips of branches. .. 102. Anthemis. 

 DD, Heads sessile in 

 forks, surrounded 

 bv 5-6 dissected 



floral Ivs 103. Cladanthus. 



A^. Receptacle naked or alveo- 

 late-fimbrilliferous 



B. Involucral bracts in many 



series 



c. Rays present 104. Chrysanthe- 

 mum. 

 (Consult also Pyreth- 

 rum.) 



cc. Rays absent 105. Tanacetum. 



BB. Involucral bracts in 1 or 



2 or few series 



c. Rays present. 106. Matricaria. 



cc. Rays absent or incon- 

 spicuous 



D. Involucre top-shaped. 107. Cenia. 

 DD. Involcure ovoid or 

 broadly bell- 

 shaped 108. Artemisia. 



9. Senecio Tribe. 



A. Involucral bracts in 1 series 

 and connate at the base 

 or beyond the middle in 

 a cup ; no outer bracts : 

 style branches of the fer- 

 tile hermaphro lite fls. 

 truncate at ape.x, usually 



peniciliate 



b. Style undivided ; disc fls. 



sterile 109. Othonna. 



BB. Style bifld : disc fls. all or 



some fertile HO. Gamolepis. 



AA. Involucral bracts in 1 or 2 

 series, not connate in a 

 cup but free, at least fin- 

 ally 



B. Style branches of herma- 

 phrodite fertile fls. 

 roundish obtuse or at 

 least not truncate and 

 wholly without appen- 

 dage or hariness at 



summit 



c. Heads composed entire- 

 ly of hermaphrodite 

 and fertile fls. homo- 

 gamous. discoid. . . . iH. Cacaliopsis. 

 cc. Heads submonoecious or 

 subdioecious. the fls. 

 containing both sta- 

 mens and pistils, 



sterile 



D. Fls. solitary, yellow. .112. Tussilago. 

 DD. Fls. racemose or 

 corymbose, white or 



purplish 113. Petasites. 



BB. Style branches (of herma- 

 phrodite fls.) either 

 truncate or capltellate 

 at summit, which Is 

 either peniciliate. hairy 

 or naked and not rare- 

 ly bears a short conical 

 or flattened appendage. 

 c. Bracts of involucre 

 herbaceous, acumi- 

 nate 114. Arxica. 



D. Receptacle flat 



DD. Receptacle hemispher- 

 ical 115. DORONICDM. 



CC. Bracts of involucre nar- 

 row, strict, usu- 

 ally ribbed or keeled. 

 D. Apex of style usually 

 truncate and peni- 

 ciliate 



E. Involucral bracts 



numerous 



F. Akenes subterete. 116. Sexecio. 

 FF. Akenes dorsally 



compressed. ..117. Cixeraria. 

 EE. Involucral bracts 

 few, 4-5 : heads 



homogamous US. Tetradymia. 



DD. Apex of style with 

 long, subulate 

 hairy appendages : 

 heads homogamous. 119. Gi'XURA. 

 DDD. Apex of stvle with 

 appendages .short 

 and obtuse or long 

 and acutish : heads 

 homogamous 120. Emilia. 



