186 DICOTYLEDONOUS. 



Genus XXXV. POLYPTERIS. 



Involucre many leaved, oblong, membranaceous, florets all 

 perfect, tubular. Seed quadrangular. Pappus chaffy. 



1. P. Integrifolia. Stem erect, slightly scabrous, branching towards the 

 summit. Leaves alternaie, linear-lanceolate, entire ; involucre 8-12 leaved ; 

 florets numerou?, with a 5-cleft border. Seed somewhat scabrous, tapering 

 at the base ; pappus consisting of 9 membranaceous scales. 

 Southern Georgia. 3-4 feet. 



Genus XXXVI. SENECIO. 



Involucre cylindrical, scaly at the base ; scales withered 

 at the point. Florets of the disk perfect, of the ray pistillate. 

 Receptacle naked. Fappus pilose, abundant. 



(a.) Flowers until rays. 



1. S. Tomentosus. Stem, tomentose, or woolly. liadicle leaves oblong, 

 oval, serrulate, on lung petioles ; cauline ones oval-lanceolate, more or less 

 divided. i^/o«-e/-s in terminal umbels ; involucre many leaved, tomentose at 

 the base ; ray florets 12-15, nerved, slightlv 3 toothed ; pappus setaceous. 



White. ■^. April— May. Middle Carolina. 2-3 feet. 



2. S. Obovatus. S^em simple, glabrous. i^^r^/cZe leaves obovate, or near- 

 ly orbicular, crenate, wiih an attenuated base ; cauline leaves much smaller, 

 sessile, piimatifid, tomentose at the base. Flowers in terminal panicles; in- 

 volucre many leaved, glabrous ; ray florets 10-12, those of the disk numerous 

 SeecZ striate; pappus pilose. 



Yellow. % June— July. Middle Carolina. 12-18 inches. 



3. S. Balsamitje. Stem erect, simple, slender, glabrous. liadicle leaves 

 oblong, or ovate, serrate, glabrous, on long petioles, cauline ones pinnatifid, 

 toothed. Flowers in terminal umbels ; involucre many leaved, membianace- 

 ous along the margins; rav florets 10-12-c!eft. Se<'(Z striate ; pappus brisdy. 



Yellow. %. A/ril— May. Pme barrens. 1-2 feet. 



4. S. Aureus. Stem erect, glabrous, slender, sometimes pubescent near 

 the base. Radicle leaves cordate, or nearly orbicular, serrate, glabrous, sup- 

 ported on long petioles ; cauline leaves, the upper ones amplexicaule, pinna- 

 tifid, small, lower ones nearly orbicular. Flowers in terminal umbels. Seed 

 striate ; pappus bristly. 



Yellow. % June— July. Mountains. 2-3 feet. 



5. S. Fastigiatus. Stem erect, glabrous. Radicle leaves oblong-ovate, 

 somewhat aeute, dentate, glabrous ; cauline ones pinnatifid, with the geg- 

 ments notched and toothed, the terminal segment ovate ; involucre with sub- 

 ulate leaflets. <S'ee(Z striate ; pappus abundant, setaceous. 



Yellow. % May- June. Middle Car. 2-3 ft. 



6. S. Lobatus. 'S'/em erect, glabrous, angled, fistulous, succulent. Leaves 

 pinnatifid, sessile, with spatulate lobes, dentate, glabrous. Flowers in cor- 

 ymbose panicles; involucre with linear leaves; ray florets about 12, 3-tooth- 

 ed at the summit. Seed striate ; pappus bristly. Baiter weed. 



Yellow. Jan— .May. Conmion. 1-3 ft. 



(b) Ray florets wanting. 



7. S. Suaveolens. Stem erect, glabrous. Leaves ovate-hastate, serrate, 

 mucronate, petioles winged, colored. Flowers in erect corymbs ; involucre 

 many leaved, slightly pubescent at the summit, with irregular subulate scales 

 at the base ; disk florets numerous. Seed striate ; pappus pilose. 



Yellow. % August— Oct. Middle Car. and Ga. 3-5 ft, 



8. S. Hieracifolius. Stem erect, pubescent, branching towards the sum- 



