Order 10.— COMPOSITE. 449 



15 H. einfireua. /3. SuLLrvAUTH, Torr. & Gr. Eough, oinerous-pubesoent ; st. 

 virgate, somewhat naked and branched above ; Ivs. opposite (the upper often 

 alternate), ovate-oblong, narrowed to the sessils base, the bwer to a winged peiiok; 

 scales lanceolate, canesoent, pales pointed, with 2 lateral teeth. — Ohio (Suliivant). 

 St. 2 to 3f high. Hda. as large as in No. 14. 



16 H. decap^talus L. Inis. opposite, ovate, acuminate, irregularly toothed, thin, 

 3-veined, scabrous above, smooth or nearly so beneath, on "winged petioles ; scales 

 lanceolate-linear, suboiliate spreading, nearly equal; rays 9 to 12, pale yellow. — 

 Copses, along streams, Can., N. Eng. and Middle States. St. 3 to 4f high, pur- 

 plish. Invol. varying in all degrees of leaflness between the present form and 

 the variety following. Aug. f 



|3. PEONDOSUS. Outer scales larger and leaf-like. (H. irondosus L.) 



17 H. trachasfolius 'Willd. Lvs. opposite, those of the branches mostly alternate, 

 thin, scabrous both sides, tripli-veined, appressed-serrate, acuminate, petiolate, 

 lower ones ovate, middle lance-ovate, upper lance-linear ; scales lance-linear, atten- 

 uate-acuminate, longer than the disk, loosely spreading, ciliate ; chaff slightly 3- 

 toothed; rays 12 to 15. — Tall, handsome, in thickets, &o., Ohio to 111. and Tenn. 

 St. purplish, 3 to 8f high. ' Lv3.'3 to 6' long. Hds. middle size, at top of the slen- 

 der, suberect branchesi Rays expanding 2 to 3'. 



18 H. doronicoides Lam. St. branched, rough or hirsute above; Ivs. opposite, 

 petiolate, ifte upper alternate and subsessile, ovate and ovate-lanceolate, acuminate, 

 tripli-veined, serrate, very scabrous above, smooth and pubescent beneath ; scales 

 lance-lincar, cUiate, longer than the dish; rays 12 to 15. — ^W. and S. States. St. 4 

 to Tf high, with irregular, alternate branches. Lvs. 3 to 10' by 1 to 3' ; petioles 

 Jto 1' long. Rays very showy, 15 to 20" by 4 to 6". Jl. — Sept. 



/3. PLENA-FLOEA. Ms. all radiate. — Gardens. A handsome flower, somewhat 

 like a yellow Dahlia. ^ 



19 H. strumosus L. St. smooth below, scabrous above; lvs. ovate-lanceolati 

 short petinled, all similar, acuminate, finely serrate, scabrous above, smooth 01 

 tomentous-oaneacent beneath; hds. few, about 10-rayed; scales ciliate, equaling 

 the disk, squarrous-spreading at tip. — 11 Grows in swamps, &c.. Can. and U. S. 

 St. 3 to 5f high, erect, branching above, Lvs. petiolate, with an acute point and 

 dose serratures, the lower surface varying in the degree of pubescence. Rays 

 bright yellow, an inch or more in length. Scales hairy. Jl. 



20 H. hirsiitus Eaf. St. simple or dichotomous above, scabrous, hirsute; lvs. 

 opposite, petiolate, subserrate, 3-veined, ovate-lanceolate, obtuse at base, acumi- 

 nate, very scabrous above, hirsute beneath ; scales ovate-lcmceolate, acuminate, hir- 

 sute, as long as the disk; rays 11 — 15. — Dry soils, "Western and Southern States. 

 Stem 4 — 7f high, with irregular, alternate branches. Leaves 3 — 10' by 1 — 3', 

 petioles^ — 1' long. Rays very showy, 15 — 18" by 4 — 6". Jl. — Sept. (H. diver- 

 sifolius Ell.) 



/3. PUEESOBNS. Lvs. tomentous beneath, subsessile. (H. pubescens Hook.) 



21 H. divaricdtus L. St. smooth, branching or simple ; lvs. nearly opposite, 

 sessile, ovate-lanceolate, 3-veined, scabrous above, smooth beneath; panicle tricho- 

 tomous, slender, few-flowered. — Rocky woods, brook-sides, U. S. and Brit. Am. 

 Stem 5f high, glaucous. Leaves rather abrupt at base, tapering to a long, acute 

 point, with obtuse serratures. Elowers large, although small for the genus, few, 

 yellow and showy. The panicle is either 2 or 3-forked. Aug., Sept. 



0. SCABEEBIMUS. St. subsimple ; lvs. thick, exceedingly rough and rigid ; op- 

 posite or temately verticillate. — Barrens, West. 



22 H. micTOCephalus Torr. & Gr. St. glabrous; lvs. opposite, thin, oblong-lance- 

 olate, acuminate at each end, petiolate, roughish above, downy, beneath ; hds. very 

 small; scales with slender, spreading points; fays 5 to T.^Thlckets, W. Can., 

 "W. States, to La. St. 3 to 6f high, fork-branched, or sometimes irregdarly. Lvs. 

 4 to 5' long. Hds. 3 to 4" diam., rays spreading 1^'. Jl. — Sept. 



23 H. Sch-OT-einitzii Torr. <fc Gr. St. pubescent, with appressed, bristly hairs; lvs. 

 rough above, densely tomentous-canescent beneath, otherwise as in No. 22. — "S. Car. 

 in the upland counties (Curtis). Similar to H. microcephalus, except in its rough 

 and downy clothing. 



24 H. iBBVigattiB Toit. & Gr. Smooth throughout; st. slender, nearly simple; 



29 



