ftancioXDM] SYNGENESIA 479 



itC) palmate-lobed, hairy ami scabrous, on slightly margined striate ciliatc 

 !iohs' Heads of flowers small,— the staminate ones numerous, in lone terminal 

 ^niculate racemes,— the pistillate ones in small clusters of 2 or 3 to 5 at the base 

 P f the racemes. Involucre of the staminate heads 1-leaved (or in a sincle series 

 ith the leaflets connate), sublobed, or crenate on the margin, "pilose externally 

 the Hereto Sinall, tubular, whitish; involucre of the pistillate heads 5-lobcd, per- 

 sistent. Akene obovoid, acuminate, crowned with 6 short erect spines, or teeth, 

 which surround the base of the acuminatum. 

 Hub. Fence-rows, and low grounds: frequent. Fl. August. Fr. October. 



2. A. et.atior ? /,. Leaves bipinnatiful, the petioles eiliate with 



| onfr hair? ; racemes paniculate, terminal. Beck, Bot. p. 209. 



A. ortemisifolia. Florid. Cestr. p. 101. Bart. Phil. 2. p. 133. and 



others ? 



Taller Ambtiosta. Vulgd — Bitter-weed. Rag-weed. Hog-wecd. 



Root annual. Stem 1 to 3 or 4 fret high, hairy and somewhat scabrous, usually 

 much branched. Leaves 2 to 4 or 5 inches long bipinnately dissected, roughish- 

 pubescent with short hairs, petiolate, the petioles mostly eiliate with long white 

 hairs. Heals of flowers small,— the staminate ones numerous, in terminal slender 

 paniculate racemes,— the pistillate florets in small bracteate or axillary clusters 

 neffT the base of the staminate racemes ; sometimes the flowers are ih'oicous,— the 

 terminal racemes (or rather spikes), as well as the clusters beneath, being all 

 pistillate, with the flowers in small sessile bracteate clusters. Akenes obovoidt 

 acuminate, with short erect teeth around the base of the acumination. 



Hub. Cultivated fields ; pastures, &c. common. Fl. August— Sept. Fr. Octo. 



Obs. This worthless weed is usually very abundant among the stubble, after a 

 crop of wheat ; but, if the land be pood, the plant seems to give place, the next 

 seasm, to the crop of clover and timothy. I have been puzzled to determine this 

 species satisfactorily. It is evidently, I think, the A. elatior, of BigeloVD % and some 

 others,— and as clearly the A. art cmi si folia, of Darton, &c. :— whilst, at the same 

 time, it acrees pretty well with EUiotPa A. paniculata ! Are they all really dis- 

 tinct species? Five or six additional species are enumerated in the U. States. 



Sub-Tribe 2. HsMANTH2.fi. Ilca'ls, when heterogamous, with the marginal 

 florets in a sincrle series, bearing ligulate corollas, the rest perfect ; never di. ti- 

 tans, n^r Dionpfcous. Receptacle mostly bracteate. Pup/ms either awned, or 

 irregular and obsolete, or crown-form, or 0. Anthers blackish, ecaudate. 



§ 2. Hemopside-e. TTearte mostly heterogamous, with the marginal florets 

 pistillate ; akenes without coating, wings, or beak, bald, or with a crown-form 

 pappus. 



383. HELIOPSIS. Pers. Mitt. Gen. G82. 

 [Greek, Helios, the Sun, and Opsis, face, or aspect ; in allusion to the flowers.] 



Involucre imbricated. Ray florets in a single series. Akenes quad- 

 rangular, somewhat compressed, entirely bald, smooth, with the epigy- 

 nous disk small. Receptacle convex, with long chaffy bracts. 



1. H. lxyjs, Pers. Leaves opposite, lance-ovate, serrate, 3-nerved r 

 srnoothish, petiolate. Beck, Bot. p. 204. 



Buphthalmum helianthoides. Mx. Am. 2. />. 130. Willd. Sp, 3. p. 

 2236. ettf. Kev>. 5. p. 125. 





