DICOTYLEDONS. '243 



1. H. AXNUUS L. Sunflower. Annual; stein erect, striate, 

 hispid, branched above, 6-12 ft. high ; leaves ovate to deltoid, 

 8-nerved, dentate, petioled, rough above, rough-pubescent beneath; 

 heads terminating the branches, -1-10 in. wide ; ray flowers numer- 

 ous, yellow; disk flowers purple; chaff 3-cleft; achenes ol)ovate, 

 smooth or slightly pubescent. June-September. Native of the 

 northwestern states; common in gardens. 



'2. II. DiVARiCATUS L. WooDLANi) SuNFLowKH. Perennial, 

 from a slender rootstock; stem slender, smooth, branched above, 

 "2-5 ft. high ; leaves opposite, ovate-lanceolate, acuminate at the 

 apex, roimded at the base, serrate, very rough above, smooth or 

 juibescent beneath; heads few, l-o in. wide, on short peduncles; 

 bracts lanceolate to linear, spreading, as long as the disk ; ray flowers 

 8-12, light yellow, disk flowers yellow; chaff entire or 3-toothed, 

 pubescent at the apex ; achenes obovate, smooth ; pappus of 2 awns. 

 July-September. Common in woods. 



3. II. DECAPETALUs L. WiLD SuNFLOWEK'. Perennial, from a 

 thickened rootstock; stem erect, slender, pubescent above, smooth 

 below, branched, 2-5 ft. high ; leaves ovate to ovate-lanceolate, thin, 

 rough al)ove, 3-nerved, acuminate at the apex, rounded at the base, 

 coarsely serrate, short-petioled, the lower opposite, the upper alter- 

 nate ; heads many, yellow, 2-3 in. wide ; bracts lanceolate-linear, 

 spreading, the outer longer than the disk; ray flowers 8-12 ; chaff 

 3-toothed or entire, i)ubescent at the apex: achenes smooth: pap^uis 

 of 2 slender awns. fIuly-Septenil»ei\ C'<)innu)n on damp soil. 



XI. COREOPSIS. 



Annual or perennial herbs; leaves ()p[)usite or the upper 

 alternate, entire or pinnately divided ; heads radiate, solitary 

 or corymbed, many-flowered; bracts in 2 rows of about 8 

 each, the inner membranaceous and a])pressed, the outer nar- 

 rower and spreading; receptacle chaffy; ray flowers neutral, 

 disk flowers tubular, perfect; achenes compressed, oval to ob- 

 long, often winged ; pajjpus of 2 scales or bristles, or wanting. 



1. C. TiNCToinA Xiitt. (i.vKDKN CoKKopsis. .Vnuiial: stem 

 erect, smootli, inanched, 2-3 ft. high; leaves 2-3 times pinnately 

 divided, the divisions linear, lower leaves petioled, the np)>er often 

 sessile and entire; heads 1-1 A in. wiile, on slender jiednncles; inner 

 bracts brown witii scarions margins, outer bracts very short; ray 

 flowers about 8, yellow with a brown base, 3-l()bed at the a^>ex ; 

 achenes linear; ]»appiis miniite or none. .V])ril -Se|)tember. Com- 

 mon in gardens. 



