54 NORTH AMERICAN FLORA [Volume 34 



as the lobes; achenes 3 mm. long, strongly striate, silky-hirsutulous ; squamellae cuneate- 



obovate, about 1 mm. long. 



Type locality: Gunnison, Colorado. 

 Distribution: Known only from the type locality. 



25. Hymenopappus integer Greene, Pittonia 3: 249. 1897. 



Hymenopappus ftavescens var. A. Gray. PI. Wright. 2: 94. 1853. 



Perennial with a thick caudex; stems 3-6 dm. high, floccose; basal leaves numerous, 



usually entire, petioled, oblanceolate, thin-floccose above, white-tomentose beneath, 5-10 cm. 



long; stem-leaves similar or irregularly 3-5-lobed with lanceolate divisions; heads few, corj^m- 



bose ; involucre densely tomentose, somewhat turbinate at the base, 7-8 mm. high and about 



as broad; bracts ovate or elliptic, narrowed upwards but obtuse, with yellow tips; corollas 



ochroleucous ; tube and throat each 1.5 mm. long, the latter more than twice as long as the 



ovate lobes; achenes 4 mm. long, faintly striate, muriculate, glabrous; pappus obsolete. 



Type locality: Mogollon Mountains, New Mexico. 

 Distribution: Western Texas to Arizona. 



26. Hymenopappus mexicanus A. Gray, Proc. Am. Acad. 19: 29. 



1883. 

 Hymenopappus obtusifolius A. Heller, Bull. Torrey Club 26: 251. 1899. 



A perennial with cespitose caudex; stems 3-6 dm. high, tomentose-floccose; leaves mostly 

 basal, the earlier ones entire, linear-oblanceolate, 5-10 cm. long, somewhat floccose above, 

 white-tomentose beneath, the rest of the lower leaves pinnatifid with linear-lanceolate or 

 oblong, acute or obtuse divisions ; stem-leaves reduced, either entire or with 2-4 approximate 

 lobes below, sessile; heads few, corymbose; involucre hemispheric, about 6 mm. high and fully 

 1 cm. broad; bracts broadly obovate, tomentose below, with conspicuous yellow tips; 

 corolla light- yellow; tube and campanulate throat each 1.5 mm. long; lobes ovate, shorter 

 than the throat; anthers partly exserted; achenes 4 mm. long, faintly striate on the faces, 

 hispidulous or in age glabrate; pappus a mere minute crown or wanting. 



Type locality: San Luis Potosi, Mexico. 



Distribution: New Mexico and Arizona to San Luis Potosi. 



27. Hymenopappus petaloideus Rydberg, sp. nov. 



A leafy-stemmed perennial with a branched caudex; stems floccose, terete, about 3 dm. 

 high; leaves 5-10 cm. long, pinnatifid with linear, acute, spreading divisions, floccose on both 

 sides; heads few, corymbose; involucre 8-9 mm. high, 10-12 mm. broad, sparingly floccose; 

 bracts lanceolate or lance-elliptic, acute, yellow and petaloid about half their length; 

 corollas light-yellow; tube more than 1 mm. long; throat 1.5 mm. long, campanulate, longer 

 than the ovate lobes; achenes 4 mm. long, faintly striate, puberulent; pappus a minute crown 

 of squamellae. 



Type collected at the head of Rock Creek Canyon, Chiricahua Mountains, Arizona, Blunter 1202 

 (herb. N. Y. Bot. Gard.). 



28. Hymenopappus radiatus Rose, Contr. U. S. Nat. Herb. 1: 122. 



1891. 



A perennial with branched caudex; stems 3-5 dm. high, floccose; leaves mostly basal, 

 once to twice pinnate into narrowly linear segments, 5-10 cm. long; heads few, corymbose; 

 involucre about 6 mm. high and 1 cm. broad, not densely floccose; bracts obovate, with only 

 a narrow yellowish scarious portion; ray-flowers about 5; ligules white, 6-8 mm. long, elliptic 

 or oval; disk-corollas yellowish; tube and throat about 1.5 mm. long each, the latter more than 

 twice as long as the lobes; achenes 4 mm. long, indistinctly striate on the faces, muriculate, 

 slightly puberulent; pappus of minute squamellae. 



Type locality: Willow Springs, Arizona. 

 Distribution: Arizona and New Mexico. 



