LEPACHrs. COMPOSITE. 381 



what branching stems. Leaves alternate, pinnately or bipinnately divided. Heads on 

 long naked peduncles. Rays spreading or drooping, yellow, sometimes partly or entirely 

 orange-brown. Disk cylindrical. Corolla, anthers and branches of the style fuscous. 



1. Lepachys pinnata, Torr. S)- Gr. Tall Lepachys. 



Leaves pinnately divided ; the divisions 3-7, lanceolate, acute at each end, sparingly 

 serrate or entire, the uppermost undivided ; disk oval-oblong, much shorter than the rays. — 

 Torr. <^ Gr. I. c. L. pinnatifida and angustifolia, Raf. I. c. Rudbeckia pinnata, Vent. hort. 

 Cels. t. 71 ; Michx. Jl. 2. p. 144 ; Bot. mag. t. 2310 ; Pursh, fl. 2. p. 576 ; Beck, hot. 

 p. 205. R. digitata, Willd. sp. 3. p. 2247 ; Ell. sk. 2. p. 451 ; Beck, I. c. R. tomentosa, 

 Ell. I. c. (excl. syn.). Obeliscaria, Cass. ; DC. prodr. 5. p. 558. 



Stem 3-4 feet high, rough and pubescent with strigose hairs, deeply sulcate. Leaves 

 usually with about five divisions, which are either coarsely serrate or entire. Rays bright 

 yellow, 1 J - 2 inches long, slightly toothed at the extremity. Corolla of the disk-flowers with 

 short recurved teeth. Achenia quadrangular, compressed, obscurely winged on each margin ; 

 the wing slightly produced at the summit. 



Shore of Lake Erie {Dr. Sartwell). A common plant in the Western States, but hitherto 

 found in only one locality in JNfew-York, 



24. HELIANTHUS. Linn. ; Endl. gen. 2538. SUNFLOWER. 



[ From the Greek, hclios, the sun, and anthos, a flower ; in allusion to the form of the heads of flowers.] 



Heads many-flowered : ray-flowers several or numerous, neutral ; those of the disk perfect, 

 commonly 10-nerved, with a short tube. Involucre imbricate in several series; the scales 

 (isually with foliaceous tips. Receptacle flat or convex ; the persistent chaff" embracing the 

 achenia. Branches of the style hispid, with a subulate appendage. Achenia quadrangular 

 or compressed, not winged or margined. Pappus consisting of two chafly scales or awns, 

 and often of two or more intermediate scales, deciduous. — Annual or perennial herbs, mostly 

 rough, with opposite or alternate leaves which are commonly triplinerved. Heads on long 

 peduncles. Rays yellow. Disk-flowers yellow or sometimes purple. 



1. Helianthus giganteus, Linn. Tall Wild Sun/lower. 



Stem rough and more or less hairy ; leaves lanceolate, acuminate-serrate, slightly triphnerved, 

 very rough above, strigosely hairy and somewhat rough underneath, narrowed and ciliate at 

 the base, the lower opposite, upper ones alternate and scattered ; scales of the involucre linear- 

 lanceolate, attenuate at the summit, ciliate ; pappus of two short lanceolate-subulate chafly 

 scales. — Linn. sp. 2. p. 905 (escl. syn. Cfronov.) ; Willd. sp. 3. p. 2242 ; Pursh, jl. 2. p. 571 ; 

 Ell sk. 2. p. 420 ; Hook. Jl. Bor.-Am. 1 p. 312 ; Beck, bot. p. 207; Darlingt. fl. Cest. 

 p. 485 ; Torr. ^ Gr. Jl. K Am. 2. p. 325. H. altissimus, Linn.?; Willd. I. c. 



