SYNGENESIA. ^^qFALIS. 139 



ticillated in 6's, stem terminated with 1, more rarely 3 

 pedunculated, hemispherical flowers, with the marg-in of 

 the seed campanulate and 5-toothed. 



Species. 1. S.vertidllatus. Flowers pale purple. Hab. 

 From New Jersey to Florida. (Common in Sussex coun- 

 ty, Delaware.) 



547. HYMENOPAPPUS. VHentier, 



Calix many-leaved, spreading; leaflets subo- 

 val, coloured. Receptacle naked. Pappus pa- 

 leaceous, many leaved (5 to 8?), segments very 

 short and obtuse, awnless. 



Herbaceous; leaves pinnatifid, alternate; lower ones 

 sometimes opposite; flowers subcorymbose. 



Species. 1. H. scabiosieus. 2- ieiivifoUus. Ph. Oes. 

 Biennial; root fusiform; stem erect and grooved, canea- 

 centiy tomentose in common with the leaves. Leaves al- 

 ternate, irregularly subbipinnatifid, segments filiformly- 

 linear, entire, thickish and convex. Flowers greenish- 

 white, fastigiately paniculate, as in many species of Sene- 

 cio; the calix scarcely spreading. Hab. On gravelly hills, 

 near the banks of the Missouri; common. 



The two species here enumerated appear at present to 

 constitute the genus; //. anthemoides with a double pap- 

 pus, and linear decurrent leaves, ought to be separated. 



548. =^ POLYPTERIS. f 



Calix many-leaved, spreading; leaflets subo- 

 val, coloured. Receptacle naked. Pappus palea- 

 ceous, about 12-leaved; leaflets rigid and cuspi- 

 date, tlie length of the seed. 



Herbaceous; leaves alternate and entire; flowers corym- 

 bose, distincir^ 



P. integnfoUa. 



Descript. Perennial. Stem erect and terete, slightly 

 scabrous, 3 or 4 feet high, branches fastigiate, corymbose. 

 Leaves all alternate, approximate, linear-lanceolate, 

 shortly petiolate, entire on tb.e margin, and on both sides 

 very scabrous; 2 to 4 inches long, and about 5 or 6 lines 

 wide. Peduncles by 3's, sometimes trichotomous, 1 to 2 



t (Many-winged.) In allusion to the conspicuous and copi- 

 ous f(>liaceous pappus. 



