4>4 



COMPOSITAE. 



[Vol. III. 



I. Tetragonotheca helianthoides 



L. Tetragonotheca. 

 (Fig. 3881.) 



Tetragonotheca helianthoides L. Sp. PI. 903. 

 1753- 



Viscidly pubescent; stem branched or sim- 

 ple, l°-2^° high. Leaves ovate, ovate-ob- 

 long, or somewhat rhomboid, thin, coarsely 

 and unequally dentate, pinnately veined, 

 acute at the apex, narrowed at the base, 

 sessile, orconnate-perfoliate, 2'-6'long, l'-3' 

 wide; heads usually few, i>^'-3' broad; in- 

 volucre 4-angled in the bud, its principal 

 bracts broadly ovate, acute; rays 6-10, strong- 

 ly parallel-ner\'ed, 2-3-toothed; corolla-tube 

 villous below; achenes 4-sided, or nearly 

 terete; pappus none. 



In dry soil, Virginia to Florida and ."Vlabania. 

 Maj'-June. Sometimes flowering again in the 

 autumn. 



J 



59. SPILANTHES Jacq. Stirp. Am. 214.//. 126. 1763. 



Aunual branching herbs, or some species perennial, with opposite, usually toothed leaves 

 and rather small, long-peduncled discoid and radiate heads, terminal, or in the upper axils, 

 or rays wanting in some species. Involucre campauulate, its bracts in about 2 series, her- 

 baceous, loosely appressed. Receptacle convex or elongated, chaffy, its chaff embracing 

 the disk-achencs and at length falling away with them. Ray-flowers yellow, or white, pis- 

 tillate. Disk-flowers yellow, perfect, their corollas tubular with an expanded 4-5-cleft limb. 

 Anthers truncate at the base. Style-branches of the disk-flowers long, sometimes penicillate 

 at the summit. Ray-achenes 3-sided, or compressed, those of the disk-flowers compressed, 

 margined. Pappus of 1-3 awns, or more. [Greek, spot- or stain-flower, not significant.] 



About 30 species, natives of warm and tropical regions. 



Spilanthes repens (Walt.) Michx. 

 Spilanthes. (Fig. 3SS2.) 



Anthemis repens Walt. Fl. Car. 211. 178S. 

 Spilanthes repens Michx. Fl. Bor. Am. 2: 131. 



1S03. 



Perennial, usually rooting at the lower nodes; 



stem slender, simple or branched, spreading or 



ascending, S'-2° long, pubescent, or nearly 



glabrous. Leaves ovate to lanceolate, petioled, 



acute or acuminate at the apex, or the lower 



obtuse, coarsely toothed, or nearly entire, I '-5' 



long; heads long-peduncled, solitary at the end 



of the stem and branches, 6"-lo" broad; bracts 



of the involucre oblong to oblong-lanceolate, 



obtuse or acute; rays S-12, yellow; receptacle 



narrowly conic; achenes oblong, most of them 



roughened when mature and hispidulous; pap- ' 



pus of I or 2 very short awns, or none. 



In moist or wet soil, Missouri to Texas, east to 

 South Carolina and Florida. June-Sept. 



60. RUDBECKIA L. Sp. PI. 906. 1753. 

 Perennial or biennial (rarely annual 1, mostly rigid, usually rough or hispid herbs, with 

 alternate undivided lobed or pinnatifid leaves, and large long-peduncled heads of tubular 

 (mostly purple) and radiate (yellow) flowers. Involucre hemispheric, its bracts imbricated 



