125. CoMPOsiTAE 257 



1. Leaves pinnatifid or pinnately dissected; adw from trop. Am.; 

 Cook Co. Aug. -Oct. Santa Maria P. hysUrophorus L. 



28. Heliopsis Pers. 



H. helianthoides (L.) Sweet. Open woods, and along roads, com- 

 mon. July-Aug. [H. scahra Dunal ; H . laevis Pers.]. 



29. Eclipta L. 



E. alba (L.) Hassk. Shores, sloughs, and fields throughout 111., 

 except the northern counties. July-Sept. 



30. Rudbeckia L. — Coneflower 



1. Leaves clasping; along railroads, rarely adv. from w. U.S 



R. a77i/)lcxicaulis Vahl 



1. Leaves not clasping, usually petiolate. 



2. Peduncles glabrous; disk greenish-yellow; rays 2.5-5 cm long, 

 soon drooping; lower leaves pinnately parted, the upper 3- 

 lobed or entire; stem 1.5-3 m tall, glabrous; alluvial soil, 



common. July-Sept. Goldenglow R. laciniata L. 



2. Peduncles more or less pubescent; disk brown or purple; stem 

 30-150 cm tall. 

 3. Chaff of the receptacle acuminate, glabrous; basal leaves 

 ovate, coarsely serrate, long-petioled ; lower stem-leaves, 

 or some of them, 3-lobed or 3-parted, the upper lanceo- 

 late, entire or serrate; rays 8-12, orange-yellow, 1.5-2.5 

 cm long; woods, locally throughout 111. Aug.-Oct. Brown- 

 eyed Susan - R. triloba L. 



3. Chaff obtuse or acutish, puberulent toward the tip. 



4. Stem (at least the upper part) tomentulose or puberulent; 

 leaves thick, tomentulose beneath, the lower ones, or 

 some of them frequently deeply 3-lobed or 3-parted; 

 rays 15-20, 2-3 cm long; prairie soil, or in open woods, 



local. Aug.-Sept. Fragrant Coneflower 



R. subtomentosa Pursh 



4. Stem strigose or hirsute; leaves merely toothed, or entire. 

 5. Leaves irregularly coarsely dentate, or serrate; stem 

 hirsute; rays 2-4 cm long; plants perennial; moist 

 ground, rare; Kankakee, Menard, Richland, Ver- 

 milion, and Wabash counties 



R. sullivantii Boynt. & Beadle 



5. Leav'es denticulate or entire. 



6. Stem sparsely strigose; rays orange-yellow, 1-1.5 cm 

 long; stigmas obtuse; pappus a minute crown; 

 plants perennial ; dry open woods, rare ; Herod, 

 Pope Co., July 29, 1898, G. P. Clinton, also Monroe 

 and Randolph counties. [R. missouriensis Engelm.| 

 Orange Coneflower R. fulgida Ait. 



