SYNGENES1A SUPERFLUA. 
407 
HELIOPSIS. Persoon. 
Involucrum imbrica- 
tum, squamis ovatis, 
subequalibus. Corol- 
lutce radii lineares. 
Pappus nullus. Semi- 
na tetragona. Recep- 
taculum conicum. 
Involucrum imbri- 
cate, the scales ovate, 
nearly equal. Florets 
of the ray linear. Pap- 
pus 0. Seeds 4-an- 
gled. Receptacle co- 
nic. 
1. Levis. 
'-P 
Persoon, 2. p. 4 73. Pursh, 2. p. 563. Nutt. 2. p. 172. 
Buphthalmum Helianthoides. Sp. pi. 3. p. 2236. Walt. p. 212. Mich. 
2. p. 130. 
Root perennial. Stem two to four feet high, glabrous, dichotomously 
branching. Leaves opposite, ovate-lanceolate, triplinerved, coarsely ser- 
rate, nearly smooth, and glabrous. Flowers solitary, terminal, and in the 
divisions of the stem, on long peduncles. Involucrum many leaved, imbri- 
cate, leaves oblong, rather obtuse. Florets of the ray oblong, yellow, about 
ten? of the disk numerous. Seeds four-angled, naked. Receptacle convex, 
scaly, the scales longer than the seeds. 
Grows in dry sandy soils — not common in the low country of Carolina. 
Flowers May — June. 
TETRAGONOTHECA. L’Heritier. 
Involucrum mono- 
phyllum, 4-gonum, 4- 
partitum, latissimum. 
Pappus nullus. Re- 
ceptaculum paleaceum. 
Involucrum one-lea- 
ved, 4-angled, 4-part- 
ed, very broad. Pap- 
pus none. Receptacle 
chaffy. 
1. Helianthoides. 
Willd. Sp. pi. 3. p. 2116. Pursh, 2. p. 563. Nutt. 2. p. 
Polymnia Tetragonotheca. Walt. p. 21 6. Mich. 2. p. 147* 
Root perennial. Stem herbaceous, erect, two to three feet high, branch- 
ing, somewhat hispid, and with the whole plant scabrous. Leaves opposite, 
