388 OKDER LXVIII. COMPOSITE. 



expanding ; ray florets 3-toothed. — Yellow. If. July — Aug. Mount- 

 ains. 10 — 18 inches. 



13. R. hir'ta, (L.) Stem hirsute, sparingly branched. Leaves alter- 

 nate, sessile, spatulate, lanceolate, hirsute, upper ones narrower. Flow- 

 era solitary, terminal ; involucre many-leaved, hairy ; exterior haves 

 the largest; pappus wanting; chaff fringed at the summit. — Yellow. 

 U. Juue — Sept. Sandy soils. Common. 2—3 feet. 



14. R. akista'ta, (Pursh.) Stem erect, corymbosely branched. Leaves 

 serrate, lanceolate, hispid. Flowers at the extremities of the branches; 

 involucre many-leaved, disk nearly hemispherical ; pappus subulate. — 

 Yellow. U . 



Genus XLVIIL— LEPA CHYS. Raf. 

 (From lepis, a scale, and pachus, thick.) 



Heads many-flowered ; ray florets in a single series, neutral ; 

 those of the disk perfect. Scales of the involucre linear, spread- 

 ing-, few. Receptacle elongated ; chaff truncated, thickened at 

 the summit, partly inclosing the achenia. Achenia of the ray 

 5-angled, hairy, abortive ; of the disk compressed, with a wing- 

 like margin on one or both sides. 



1. L. tinna'ta, (T. <fe G) (JRndbcckia tomentosa,~E\\.) Stem erect, 

 pubescent, slightly furrowed, much branched, branches erect, virgate. 

 Leaves alternate, lanceolate, acute, scabrous, tomentose, the lower ones 

 somewhat trifoliate, upper leaves entire. Flowers at the extremities of 

 the branches ; involucre tomentose, with nearly subulate reflexed leaves ; 

 ray florets about 8; pappus almost wanting. — Yellow. 2£. Sept. — 

 Oct. Middle and western Geo. 3 — 1 feet. 



Gexus XLIX.— DRACO'PIS. Cass. 

 (From drakon, a dragon, and opsis, like.) 



Heads many-flowered ; ray florets neutral, those of the disk 

 perfect. Scales of the involucre in 2 series, the exterior largest, 

 the inner very small. Receptacle cylindrical, pointed. Chaff 

 linear. Achenia terete. Pappus none. 



1. D. amplexicau'lis, (Cass.) Stem branching, glabrous, striate ; up- 

 per leaves cordate, clasping, entire, lower ones serrate. Heads solitary. 

 — Yellow. Louisiana. 



Genus L.— HELIAN'THUS. L. 



(From helios, the sun, and ajithos, a flower.) 



Involucre imbricate, leafy, generally squarrose ; ray florets 

 neutral, those of the disk perfect Receptacle chaffy. Pappus 

 2-leaved, caducous. 



a. Florets of the disk dark purple. 

 1. H. deb'ilis, (Nutt.) Stem decumbent, slender, branching. Leaves 

 mostly alternate, ovate, serrulate. Heads terminal, on slender pedun- 

 cles ; achenia pubescent ; pappus 2 chaffy awns. — 0. E. Florida and 

 Louisiana. 1 — 2 feet. 



