COMPOSITAE. 



[Vol. III. 



19. Helianthus hirsutus Raf. Stiff- 

 haired Sunflower. (Fig. 3916.) 



Helianlhus hiisutus Raf. Ann. Nat. 14. 1820. 



Perennial; stem densely hirsute, usually branched' 

 above, stout, rigid, 2°-4° high. Leaves ovate-lance- 

 olate or the upper lanceolate, rounded, truncate or 

 subcordate at the base, acuminate at the apex, thick, 

 very rough above, rough-pubescent beneath, 3- 

 uerved, serrate or serrulate, 3'-6' long, Yz'-i' wide, 

 short-petioled, or the uppermost sessile, nearly all' 

 opposite; heads usually several, I'-^Yz' broad; in- 

 volucre hemispheric, its bracts lanceolate, or ovate- 

 lanceolate, acuminate, ciliate, mostly puberulent, 

 erect or but slightly spreading, e<|ualling or shorter 

 than the yellow disk; rays 12-15; chaff obtusish, 

 pubescent at the summit; achenes oval, rounded at 

 the summit, glabrous; pappus of I or 2 subulate awns. 



In dry soil, Pennsylvania and Ohio to Wisconsin, 

 south to "West ^'i^ginia, Georgia and Texas. July-Oct. 



HeUanthus hirsiitus trachyphyllus T. & f".. Fl. N. A. 2: 329. 

 Leaves thick, very rough oti both sides; heads larger; 

 involucral bracts more spreading. Nebraska to Arkansas. 



20. Helianthus laetiflorus Per.s. Showy 



Sunflower. (Fig. 3917.) 



/fi'Hanllius laetiflorus Pers. Syn. 2: 476. 1807. 



Perennial; stem scabrous or hispid, leafy, 4°-8° 

 high. Leaves oval -lanceolate or ovate lanceolate, 

 short-petioled, 3-nerved, rough on both sides, nar- 

 rowed at the base, long-acuminate at the apex, serrate 

 or serrulate, 4'-io' long, ^^'-2^' wide, the upper of- 

 ten alternate; heads usually several, 2'-4' broad, 

 mostly short-peduncled; bracts of the hemispheric 

 involucre ovate-lanceolate, or oblong-lanceolate, im- 

 bricated in only 2 or 3 series, ciliate, otherwise nearly 

 glabrous, appressed or but little spreading, shorter 

 than or equalling the yellow disk; rays 15-25, showy; 

 chaff of the receptacle entire, or sometimes 3-toothed. 



On prairies and barrens, Pennsylvania and Ohio to 

 Minnesota. Aug. -Sept. 



21. Helianthus tomentosus Michx. 

 WooU}^ Sunflower. (Fig. 3918.) 



Helianlhus tomenlosus Michx. Fl. Bor. Am. 2: 141. 



1803. 



Perennial; stem stout, hirsute or hispid, especi- 

 ally above, branched, 4°-io° high. Leaves rather 

 thin, ovate, or the lower oblong, mostly alternate, 

 3ribbed above the base, gradually or abruplly con- 

 tracted into margined petioles, rough above, softly 

 villouspubescent beneath, .sparingly serrate, the 

 lower often 1° long and 4' wide; heads commonly 

 several or numerous, 3'-4' broad; involucre hemi- 

 spheric, its bracts imbricated in many series, linear- 

 lanceolate, long-acuminate, squarrose, densely hir- 

 sute and ciliate, usually longer than the broad 

 yellowish disk ; chaff of the receptacle and lobes of 

 the disk corollas pubescent; pappus of 2 subulate 

 awns. 



In dry soil, Virginia to Georgia and Alabama. Re- 

 ported from Illinois. .\ug.-Oct. 



