50 NORTH AMERICAN FLORA [Volume; 34 



6. Hymenopappus corymbosus T. &. G. Fl. N. Am. 2: .372. 1842. 



Hymenopappus corymbosus Nuttallii T. &. G. Fl. N. Am. 2: 372. 1842. 

 Hymenopappus tenuifolius Nutt. ; T. & G. Fl. N. Am. 2: 372, as synonym. 1842. 



A leafy-stemmed biennial; stem 3-7 dm. high, angled and grooved, glabrate below, 

 glandular and puberulent above; leaves twice pinnatifid with narrowly linear divisions, some- 

 what floccose when young, glabrate in age; heads numerous, corymbose; bracts oblong or 

 oblong-obovate, with greenish-white tips; corolla yellowish; tube about 2 mm. long; throat 

 campanulate, 1.5 mm. long, about equaling the oblong lobes; anthers wholly exserted; 

 filaments partly so; achenes 3.5 mm. long, broadly obpyramidal, merely puberulent, strongly 

 muricate and striate; squamellae minute. 



Type locality: Arkansas. 



Distribution: Missouri and Arkansas to Kansas and Texas. 



7. Hymenopappus artemisiaefolius DC. Prodr. 5: 658. 1836. 



A leafy-stemmed biennial; stem 3-10 dm. high, floccose, striate; leaves loosely floccose 

 and glabrate above, densely white-tomentose beneath, the earliest ones with lanceolate entire 

 blades, those following lyrately lobed, the main stem-leaves once or twice pinnatifid with 

 linear-lanceolate or oblong, entire or toothed lobes; heads corymbose; involucre 6 mm. high,, 

 about 1 cm. broad; bracts obovate, with sulphur-yellow or whitish tips; corolla- tube about 2 

 mm. long; lobes more than 1 mm. long, about equaling the broadly campanulate throat; 

 anthers wholly exserted; achenes 3 mm. long, striate, hirsute; squamellae about 1 mm. long. 



Type locality: Texas. 

 Distribution: Texas and Oklahoma. 



8. Hymenopappus robustus Greene, Bull. Torrey Club 9: 63. 1882. 



Hymenopappus flavescens A. Gray, PI. Wright. 2: 94. 1853. Not H. flavescens A. Gray. 1849. 



A leafy-stemmed biennial; stem 3-8 dm. high, striate, white-tomentose, corymbosely 



branched ; leaves bipinnatifid into narrowly linear divisions, or the earliest ones rarely pinnatifid 



with lanceolate divisions, loosely floccose above, white-tomentose beneath; heads corymbose; 



involucre 6 mm. high, about 8 mm. broad; bracts obovate, tomentose with yellow tips; corollas 



yellow; tube about 2 mm. long; lobes lance-oblong, about equaling the campanulate throat, 



1.5 mm. long; anthers wholly and filaments partly exserted; achenes 4 mm. long, striate, 



long-villous on the angles; squamellae oblong, fully half as long as the corolla-tube. 



Type locality: New Mexico. 



Distribution: Texas to Arizona, Coahuila, and Chihuahua. 



Illustrations: Britt. & Brown, 111. Fl./. 3963; ed. 2./. 4532. 



9. Hymenopappus flavescens A. Gray, Mem. Am. Acad. II. 4: 97. 



1849. 

 Hymenopappus Fisheri Wooton & Standley, Contr. TJ. S. Nat. Herb. 16: 191. 1913. 



A leafy-stemmed biennial; stem erect, 3-4 dm. high, floccose; leaves once pinnatifid 

 with oblong or broadly linear obtuse divisions, densely tomentose beneath, sparingly floccose 

 but soon glabrate above; heads numerous, corymbose; involucre 5~6 mm. high, 8-10 mm. 

 broad; bracts sparingly tomentose, obovate, with thin yellow scarious tips and margins; 

 corollas bright-yellow; tube 2 mm. long; throat campanulate, about equaling the lanceolate 

 lobes; achenes nearly naked on the faces, densely villous on the angles; squamellae con- 

 spicuous, 1 mm. long. 



Type locality: Between San Miguel and Las Vegas, New Mexico. 

 Distribution: Western Texas and New Mexico. 



♦ 10. Hymenopappus tenuifolius Pursh, Fl. Am. Sept. 742. 1814. 



A leafy-stemmed biennial; stem 3-7 dm. high, corymbosely branched above, loosely 

 floccose; leaves 2-10 cm. long, twice pinnatifid into filiform divisions, loosely floccose; in- 

 volucre hemispheric, 5 mm. high, 7-8 mm. broad; bracts obovate, with yellow tips, floccose; 



