278 COMPOSITE. (COMPOSITE FAMILY.) 



1. Annuals; leaves mostly alternate, pet iolate ; receptacle flat ; disk brownish- 



1. H. annuus, L. (COMMOX SUNFLOWER.) Tall, rough ; leaves triple- 

 ribbed, ovate or the lower cordate, serrate ; involucral scales broadly ovate to 

 obloug, long-pointed, ciliate; disk usually 1' broad or more. Minn, to Tex., 

 and westward ; long cultivated, and occasionally found in waste grounds. 



2. H. petiolaris, Nutt. More slender, 1-3 high; leaves oblong- or 

 ovate-lanceolate, smaller (1 -3' long), mostly entire; scales lanceolate or ob- 

 long-lanceolate, seldom ciliate; disk ^' broad or more. Minn, to Tex., and 

 westward. 



2. Perennials ; receptacle convex or at length low-conical ; lower leaves usually 



opposite. 



* fnvolucral scales loose, becoming squarrose, narrowly lanceolate, pointed (' 



long) ; disk usual/ // purple or brownish ; leaves linear, l-neroed. 



3. H. orgyalis, DC. Stem glabrous, tall, very leafy ; leaves mostly al- 

 ternate, linear to filiform and entire, or the lowest lanceolate and serrulate ; 

 scales filiform-attenuate. Dry plains, Mo. to Neb., south and westward. 



4. H. angustifolius, L. Stem slender (2-6 high), usually scabrous; 

 leaves long and linear, sessile, entire, with revolute margins ; heads loosely 

 corymbed, long-peduncled ; scales acute or pointed. Low pine barrens, N. J. 

 to Ky., and southward. 



* * Involucral scales closer, more imbricated, short, unequal and not foliaceous ; 



leaves lanceolate to ovate, mostly opposite and 3-nerred. 



H- Disk dark. 



5. H. atrorubens, L. Rough-hair;/; stem slender (2 -4 high), smooth 

 and naked and forking above ; leaves thinnish, ocate or oval to oblong-lanceolate, 

 or the lowest heart-shaped (3-6' long), serrate, abruptly contracted into a 

 margined petiole ; heads small, corymbed ; scales ovate, obtuse, ciliolate, ap- 

 pressed ; rays 10-16; pappus of 2 fringed scales. Dry soil, Va. to Ark., and 

 southward. 



6. H. rigidus, Desf. Stem stout (2-6 high or more), simple or spar- 

 inglv branched, rough ; leaves very thick and rigid, rough both sides, oblong-Ian- 

 cenlate, usually pointed at both ends, nearly sessile, entire or serrate, the lowest 

 oval ; heads nearly solitary, pretty large ; scales ovate or oblong, obtuse, or 

 mostly acute, ciliate, appressed ; rays 20 - 25 , pappus of 2 large and often sev- 

 eral small scales. Dry prairies, Mich, to 111., and westward. 



H- *- Disk yell on\ 



7. H. Isetifldrus, Pers. Closely resembling the last; leaves rather 

 thinner; heads single or corymbed; scales rather fewer (in 2 or 3 rows), uar 

 rower and acute or mostly acuminate. Dry open places, Ohio to Wise, and 

 Minn., and southward. Rays showy, 1-2' long. 



8. H. OCCidentaliS, Kiddell. Somewhat hairy, stem slender, simple, 

 naked above (1-3 high, sending out runners from the base), bearing 1-5 

 small heads on long peduncles ; lowest leaves oval or lanceolate-ovate, entire or 

 obscurely serrate, roughish-pubescent beneath, abruptly contracted into long hairy 

 petioles ; the upper small and remote ; scales ovate to lanceolate, acute or pointed, 

 sometimes ciliate. Dry barrens, Ohio to Wise, and Miun., and southward. 



