( 3372 ) 
HELiopsis L&vISs. SMOOTH-LEAVED 
HEtropsis. 
“Class and Order. 
SyNGENESIA SUPERFLUA. 
( Nat. Ord.—Composira. ) 
Generic Character. 
Radius uniserialis. Achenium angulato-compressum, om- 
nino calvum, glabrum, disco epigyno parvo.—Herbe Ame- 
ricaneé, foliis oppositis, integris ; capitulis luteis, solitariis, 
ramos superne aphyllos terminantibus ; involucris imbricatis ; 
rachide conico. Less. 
Specific Character and Synonyms. 
Heuiopsis levis ; caule glaberrimo, foliis glabris ovato-acu- 
minatis serratis, involucri squamis externis lanceolatis 
subserratis.. Dun. 
Hexiopsis levis. Pers. Syn. Pl. v. 2. p. 473. Pursh, Fl. 
Am. v. 2. p. 563. Dun. in Mem. du Mus. v. 5. p. 55. 
Bururuatmom helianthoides. Linn.—L’ Hérit. Stirp. p. 93. 
t.45. Ait. Hort. Kew. ed. 2. v. 5. p. 125. 
Sirpuium solidaginoides. Linn. Sp. Pl. v. 1302. 
Heiantuus levis. Linn. Sp. Pl. p. 1278. 
Rupsecxia oppositifolia. Linn. Sp. Pl. p. 1280. 
The Genus Hexiopsis (from 2ass the sum and o ¥ss, a re- 
semblance) was established by Persoon upon the species 
here figured, a native of the United States. To this was 
added another North American species, H. scabra, differing 
indeed but slightly from the present one, and perhaps not 
specifically, H. buphthalmoides of Peru and H. ? dubia, a 
very doubtful species, as its name implies, of South America, 
by Donat; and H. canescens, a Columbian plant. H. levis 
is 
