COMPOSITACEAE (COMPOSITE FAMILY) 229 



E. Involucre bracts flat; receptacle conic to subulate. U. (Honor of K. E. 



von Baer, a Russian botanist.) Baeria aristosa (GOLD FIELDS) 



EE. Involucre bracts inrolled; receptacle flat. E. (Gk. rigios = stiff; + 



pappus.) Rigiopappus leptocladus 



BB. Leaves palmately 2-s-parted. E. (Honor of J. F. Bahi, a Spanish botanist.) 



Baliia oppositif olia 

 AA. Leaves alternate. 

 F. Heads radiate. 

 G. Receptacle not chaffy. 

 H. Akenes 4-angled; pappus scales blunt or lacerate. 



I. Involucre bracts somewhat united; rays none or present; herbage floccose- 

 woolly. ERIOPHYLLUM (p. 229) 



II. Involucre bracts not united; rays none; herbage viscid-pubescent. E. 

 (Honor of G. W. Hulse, a U. S. army surgeon.; Hulsea nana 



HH. Akenes 5-io-ribbed; pappus scales acuminate or aristate. 

 J. Involucre bracts erect. E. (Diminutive of Gk. aktis = a ray; probably 

 because the rays are present, though short.) Actinella richardsoni 



JJ. Involucre bracts spreading or reflexed. HELENIUM (p. 229) 



GG. Receptacle with bristlelike chaff. W. E. (Honor of Gaillard de Meren- 

 tonneau, a French botanist.) Gaillardia aristata 



FF. Heads rayless. 



K. Involucre bracts with white or purplish tips. E. (Gk. hymen = a membrane; 

 + pappus; because the pappus scales are hyaline.) Hymenopappus filifolius 



KK. Involucre bracts green to the tips. 



L. Involucre bracts somewhat united; corollaslyellow. ERIOPHYLLUM (p. 229) 

 LL. Involucre bracts not united ; corollas yellow or white or flesh-colored. 

 (Gk. chainein = to yawn, aktis = a ray; referring to the dilated marginal corol- 

 las.) Chaenactis 



ERIOPHYLLUM (WOOLLY SUNFLOWER) 



Floccose-woolly. Heads many-flowered ; involucre green. Ray flowers 

 yellow, or so short that there are practically none. Disk flowers yellow. 

 Pappus of blunt veinless chaffy scales. (Gk. erion wool, phyllon = a 

 leaf.) 



A. Rays 1-3 mm. long. U. E. stachadifolium 



AA. Rays 10-20 mm. long. 



B. Akenes glabrous. W. C. E. E. lanatum 



BB. Akenes glandular. U. C. E. E. multiflorum 



HELENIUM (SNEEZEWEED) 



Heads many-flowered; involucre herbaceous. All flowers yellow. 

 Akenes hairy on the ribs. Pappus scales 5-6, thin, scarious, acuminate or 

 awn-pointed. (Said to be in honor of Helen of Troy, who used it cos- 

 metically.) 



A. Leaf blades not decurrent on the stem. E. H. hoopesii 

 AA. Leaf blades decurrent on the stem. 



B. Leaves dentate; heads several to many. W. C. E. Poisonous to cattle and 



sheep. H. autumnale 



BB. Leaves entire; head i. U. H. bigelovii 



