196 



DICOTYLEDONOUS. 



base. /nt'oZMcre hispid exterior leaves largest, somewhat foliaceous. Ray 

 flarets 12-14, 2-clefr. Pr/;j;^M5 a slight margin. CAoJ glabrous. 

 Yellow. August— Oct. Mountains. 2-3 ft. 



12. R. HiRTA. S/em hirsute, sparingly branched. Leaves alternate ses- 

 sile, spatulate lanceolate, hirsute, upper ones narrower. Flowers solitary 

 termmal. Lnvolacrem^ny leaved, hairy ; exterior leaves the largest. Pai- 

 ;)Ms wanting. t;A«# fnrged at the summit. 



Yellow. %. .lune— Sept. Sandy soils. Common. 2-3 ft. 



13. R. Aristata. Stem erect, corymbosely branched. Leaves serrate, 

 lanceo ate, hispid. Flowers at the extremities of the branches. Involucre 

 manv leaved, disk nearly hemispherical. Pappus subulate. 



Yellow. %.. 



Genus LV. SILPHIUM. 



Involucre leafy, squarrose. Ray florets pistillate, those of 

 the disk staminate. Seed compressed, obcordate, emarginate, 

 2 toothed. Receptacle chaffy. 



1; S. Laciniatum. Stem hispid, simple, nearly glabrous towards the base. 

 Leaves alternate, about 2 feet long and 1 wide, pinnatifid, the seaments tooth- 

 ed and sinuate, scabrous. Involucre consisting of 10 leaves, subulate. Ray 

 florets numerous, about as long as the involucre. Pappus 2'small awns. 

 Yellow. % August— Sept. Western Ga 8-12 ft. 



2. S. PiNNATiFiDUM. Stem glabrous. Leaves large, pinnatifid, sinuate ; 

 segments usually acute, upper surface glabrous, the under slightly scabrous. 

 Flon-ers in panicles, large. Involucre glabrous with the exterior leaves orbi- 

 cular, the interior oval. 



Yellow. % July— Western Ga. and Ala. 4-6 ft. 



3. S. CoMPosiTUM. Stem glabrous. Leaves irregularly lobed, sinuate, 

 sometimes pinnatifid, glabrous above, somewhat hairy beneath. Flowers in 

 terminal panicles. Involucre w-ith the leaves sli^htlv ciliate. 



Yellow. % May— Aug. Pine barrens ~ 2-3 ft. 



4. S. Terebinthinaceum. Stem erect, glabrous. Radicle leaves cordate 

 or nearly orbicular, or reniform, sometimes lobed and dentate ; cauline ones 

 alternate, serrate, scabrous, ovate. Flowers numerous, in corymbose pani- 

 cles, exterior leaves of the involucre ovate, acute, the interior obtuse. Ray 

 florets 10-12. 



Yellow. % July — Aug. Mountains. 4-5 ft. 



5. S. Perfoliatum. Stem glabrous, quadrangular. Leaves opposite, con- 

 nate, serrate, ovate, the upper ones perfoliate, broad. Flon-ers on axillary 

 peduncles. Involucre squarrose. Ray florets 24. 



Yellow. % July- Sept. Mountains. 4-6 ft. 



6. S. CoNNATUM. Stem erect, terete, hispid, with reflexed hairs. Leaves 

 opposite, perfoliate, scabrous, serrate. Flouers in terminal panicles. Invo- 

 lucre squarrose, with ovate leaves, reflexed at the summit. Ray florets 12. 



Yellow. % August — Sept. Middle & western Ga. 4-5 ft. 



7. S- Integrifolium. Stem quadrangular, hispid. Leaves opposite, ses" 

 sile, oblong, entire, scabrous on the upper surface. Flowers few, on short 

 peduncles. Involucre with oblong ovate leaves. 



Yellow. %- August — ^Sept. Mountains. 3-4 ft: 



8. S. L^viGATUM. N/ew quadrangular, glabrous. J?acZ?'rZe leaves lanceo- 

 late, oblong ; the lower cauline ones oval-lanceolate, on short petioles, which 

 are connate at the base ; the upper ones sessile, ovate, the highest cordate, 

 glabrous. Flowers in corymbs. Involucre with ciliate leaves, the inner ones 

 largest. 



Yellow. % August— Sept. Middle Ga 2-3 ft. 



9 S ScABERRiMUM. Stem angled when young, becoming terete when old, 



