280 COMPOSITAE. 



ous, pistillate; disk-flowers yellower turning brownish or purplish, 

 small and very numerous, all fertile; involucral bracts spreading 

 or reflexed at maturity; pappus of 5-12 thin or hyaline chaffy 

 scales with or without midribs ; akenes top-shaped, striate-ribbed, 

 hairy on the ribs. 



Helenium autumnale grandiflorum (Nutt.) Gray. Perennial, erect, 30-90 

 cm. high, glabrous or puberulent; leaves oblong or ovate-lanceolate, acute, 

 dentate or nearly enure, 5-12 cm. long, decurrent on the stem forming wings, 

 heads few or many, long-peduncled, 10-15 mm. broad; involucre nearly flat, 

 the bracts linear or linear-spatulate, pubescent; rays 10-16, yellow, somewhat 

 drooping, 1-2 cm. long, all fertile; akenes pubescent; pappus scarious, the 

 scales acuminate, awn-pointed. Banks of Snake River. 



ADDENDA. 



(Insert on page 253.) 



377. IV A. 



Heads in dense panicles; leaves ovate to orbicular, coarsely serrate. 



/. xanthiifolia. 

 Heads solitary, axillary; leaves oblong to obovate, most entire. 



/. axillaris. 



Iva xanthiifolia Nutt. See page 253. 



Iva axillaris Pursh. Stems erect or nearly so, 30-60 cm. tall, simple or 

 but little branched, arising from creeping rootstocks; leaves numerous, firm 

 in texture, narrowly oblong to obovate, sessile, entire or nearly so, obtuse; 

 2-3 cm. long; heads axillary, mostly solitary, the peduncle much shorter than 

 the leaf; involucre hemispheric, the bracts united into a 4- to 5-lobcd or cleft 

 cup. Washtucna, Elmer. Abundant in the sagebrush region. 



