COMPOSITACEAE (COMPOSITE FAMILY) 229 



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



von Baer, a. Russian botanist.) Baeria arlstosa (gold fields) 



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



pappus.) Riglopappus leptocladus 



BB. Leaves palmately 2-5-parted. E. — (Honor of J. F. Bahi, a Spanish botanist.) 



Babla oppositlfolia 

 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) 



n. Involucre bracts not united; rays none; herbage viscid-pubescent. E. — ■ 

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



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

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

 because the rays are present, though short.) Actlnella rlchardsoni 



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. 

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

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



KK. Involucre bracts green to the tips. 

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

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

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

 las.) Chaendctls 



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. mtiltiflorum 



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. ^' autumnale 



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



