116 NORTH AMERICAN FLORA [Volume 34 



17. Hymenoxys Greenei (Cockerell) Rydb. Bull. Torrey Club 

 37: 448. 1910. 



Picradenia biennis Greene, Pittonia 3: 273, in part. 1898. Not Actinella biennis A. Gray. 1878. 

 Hymenoxys Lemmonii Greenei Cockerell, Bull. Torrey Club 31: 479. 1904. 



A biennial or perennial but not eespitose; stem 3-5 dm. high, branched above with erect 

 branches, striate, puberulent; leaves erect, 5-10 cm. long, divided into 3-5 linear divisions, 

 which are 2-3 mm. wide, puberulent; heads corymbose; involucre hemispheric, 5 mm. high 

 and about 10 mm. broad; outer bracts 9-12, lanceolate, united at the base, carinate, acute; 

 inner bracts ovate, acute, erose; ligules about 8 mm. long and 4 mm. wide; disk-corollas 3.5 

 mm. long, glandular; achenes 3 mm. long, densely hirsute; squamellae 3 mm. long, ovate, 

 aristate-acuminate. 



Type locality: Rock Creek, Utah. 



Distribution: Utah, Nevada, and northern Arizona. 



18. Hymenoxys subintegra Cockerell, Bull. Torrey Club 31: 480. 



1904. 



A perennial, with a tap-root and short thick caudex; stems solitary or few, about 2 dm. 

 high, canescent; lower leaves linear, canescent, 5-6 cm. long, 2-3 mm. wide, entire; middle 

 cauline leaves broader and usually with a few linear or lance-linear divisions; upper leaves 

 linear and entire; heads several but inflorescence not flat-topped; involucre hemispheric, 

 5-6 mm. high, 10-12 mm. broad; outer bracts about 12, united one fourth to one third their 

 length, carinate below, the free portions narrowly lanceolate and green, woolly; inner bracts 

 broadly oval, short-acuminate; ligules deep-yellow, 8-9 mm. long; disk-corollas 3.2 mm. long; 

 achenes 2.5 mm. long, silky; squamellae ovate-lanceolate, long-acuminate, nearly as long as 

 the disk-corollas. 



Type locality: Nagle's Ranch, Arizona. 

 Distribution: Known only from the type locality. 



19. Hymenoxys helenioides (Rydb.) Cockerell, Bull. Torrey Club 



31: 4S1. 1904. 



Picradenia helenioides Rydb. Bull. Torrey Club 28: 21. 1901. 

 Dugaldia helenioides A. Nelson; Coult. & Nels. Man. 562. 1909. 



A tall biennial; stem branched above, about 5 dm. high, finely puberulent; leaves rather 

 firm, finely puberulent, 5-15 cm. long, 5-10 mm. wide, linear or narrowly linear-oblanceolate, 

 some of the middle ones often parted into 3-5 linear divisions; heads corymbose; involucre 

 somewhat tomentose, hemispheric, 8-9 mm. high and about 15 mm. broad; outer bracts 14-18, 

 narrowly lanceolate, united only at the base, longer than the inner; ligules orange, about 

 10 mm. long and 3 mm. wide; disk-corollas 4 mm. long, sparingly glandular; tube 1 mm. 

 long; achenes 3 mm. long, silky-hirsute; squamellae 3 mm. long, lanceolate, attenuate into 

 an awn-point. 



Type locality: Sangre de Cristo Creek, southern Colorado. 

 Distribution: Known only from the type locality. 



20. Hymenoxys chrysanthemoides (H. B. K.) DC. Prodr. 5: 661. 



1836. 



Actinea chrysanthemoides H. B. K. Nov. Gen. & Sp. 4: 298. 1820. 

 Dugaldia chrysanthemoides Cass. Diet. Sci. Nat. 55: 271. 1828. 

 Actinella chrysanthemoides A. Gray, Proc. Am. Acad. 19: 32. 1883. 



An annual; stem 2-5 dm. high, branched above, striate, puberulent; leaves 2-4 cm. long, 

 bipinnatifid into linear-filiform divisions, sparingly puberulent or glabrate; heads corymbose; 

 peduncles 5-15 cm. long; involucre depressed-hemispheric, 6 mm. high, 12-18 mm. broad; 

 outer bracts 12-16, linear, united only at the base, with spreading tips, pubescent; inner 

 bracts similar, but longer and broader, acute, not erose; receptacle conic; ligules 8-10 mm. 

 long, 3-4 mm. wide, deeply 3-lobed; disk-corollas 3.5-4 mm. long; tube glandular, about 



