PAM. 173. 151 



rays yellow, drooping; disk greenish-yellow; pappus a 4-toothed or entire 

 crown. Swampy ground. Summer and Fall. 

 R. heterophylla. Stems pobeneat, ;'>.irinwjly branched; lower ^innately 



tad, to upper loaws ovuic, co mel y toothed, all petioled; reyi yel- 

 low. drooping at last; disk greenish yellow; pappus a cup-shaped border. 

 Swamps. Summer. 



R. hirta. Stems hirsute, usually bracted; leaves elliptic to oblong, with winged 

 petioles, or the upper leaves sessile; rays yellow or orange, disk purplish 

 brown; pappus absent. Dry soil. Summer and Fall. 



I'appus of 2 awns or scales, early deciduous; — herbs with alternate or 

 opposite, simple leaves, and conspicuous heads; bracts in several 

 rows; rays yellow; disk brownish, yellowish or dark purple, 

 florets perfect and fertile. Summer and Fall. - Helianthus, SunfUnver 



H. angustifolius. Scabrous perennial, 6-18 dm., branched; leaves few, alter- 

 nate, linear, sessile; bracts linear; rays 1 2- IS. disk purple. Moist soil. 



H. divaricatus. Perennial. 3-12 dm., smooth or glaucous, simple or with slender 

 branches above; leaves opposite, lanceolate or ovate-lanceolate, entire or 

 serrate, mostly sessile; bracts lanceolate; rays 7-15, disk yellow. Open 

 woods. 



H. radula. Hispid or hirsute; simple or branched at the base; leaves few near 

 the base, suborbicular or rhombic; ray-flowers few, minute or wanting; 

 disk purple. Low pine-barrens. 



H. Floridanus. Sparingly pubescent. 1-2 m., branched above; leaves lanceolatt 

 to linear; disk purple. Sandy soil. Throughout the year. 



H. annuus. Pubescent annual, 1-2-3 m. tall, branched above; leaves mainly 

 alternate, broadly ovate, toothed; bracts ovate to oblong. Cultivated 

 and escaped in sandy soil. 

 33. Awns hispid downward, --------- 34 



33. Awns hispid upward; — herbs with entire or pinnately divided leaves, 



and heads at the end of the peduncle-like branches; raj's com- 

 monly 8; disk-flowers perfect and fertile; pappus of 2 awns or 

 scales, ________ Coreopsis, Tickseed 



C. lanceolata. Glabrous, branched; leaves chiefly below, opposite, petioled, 

 spatulate to linear-oblanceolate; rays 3-lobed at the apex, the middle-lobe 

 notched, yellow; disk yellow; pappus a pair of small fimbriate scales. Dry 

 soil. Spring and Summer. 



C. angustifolia. Smooth, 4-angled, branched above; leaves opposite, the lower 

 petioled, oblanceolate, the upper sessile, linear, or mere scales; heads small, 

 corymbose; raj's 3- toothed, yellow; disk dark purple; pappus a pair of awns. 

 Wet pine-land. Summer and Fall. 



C. gladiata. Glabrous, branched above; leaves mostly alternate; the lower 

 ones elliptic-oblong to lanceolate, petioled; the upper sessile, reduced to 

 scales; rays yellow, disk purple; pappus a pair of slender awns. Low pine- 

 barrens. Fall. 



C. nudata. Smooth, slender, branched above; leaves alternate, rush-like, the 

 upper minute; rays pink to purple, 3-toothed; disk yellow; pappus a pair 

 of minute awns. Wet pine-land. Spring and Summer. 



C. Drummondii, Bnru.n-tyed Susie. Pubescent; leaves pinnately divided 

 rays yellow with purple base, unequally 5-toothed; disk dark purple. Cul- 



tted and escaped. Often with the inner row of the involucre col' 

 and sometimes with pistil and stamens in the ray-flowers. Summer. 



34. Achenes beakless; — herbs with chiefly opposite leaves and numer- 



