WOOTON AND STAKDLEY FLOEA OF NEW MEXICO. 721 



Heads mostly loss than 10 mm. in diameter; stems 



with more numerous, less reduced leaves; 



stems densely or sparsely pubescent, low. 



Stems densely tomentose; pappus evident, 



nearly equaling the corolla lobes 8. H. arenosus. 



Stems sparingly tomentose; pappus hidden 



by the hairs of the achenes 9. H. jilifolius. 



1. Hymenopappus radiatus Rose, Contr. U. S. Nat. Herb. 1: 122. 1891. 

 Type locality: Willow Springs, Arizona. 



Range: Mountains of southern Arizona and New Mexico. 



New Mexico: Black Range; White and Sacramento mountains. Transition Zone. 



This plant is difficult to distinguish from Lcucampyx neivberryi, the two being very 

 similar in general appearance. Leucampyx is usually a little taller and more 

 branched. The two may be definitely distinguished by the presence of chaff on the 

 disk in Leucampyx; in Hymenopappus there is none. 



2. Hymenopappup integer Greene, Pittonia 3: 249. 189 



Type locality: Mogollon Mountains, New Mexico. Type collected by Rusby 

 (no. 180). 

 Range: Mountains of southwestern New Mexico. 

 New Mexico: Mogollon Mountains; G O S Ranch. 



3. Hymenopappus mexicanus A. Gray, Proc. Amer. Acad. 19: 29. 1883. 

 Type locality: In the higher mountains near San Luis Potosi, Mexico. 

 Range: Mountains of southern New Mexico and northeastern Mexico. 



New Mexico: Mogollon Mountains; Santa Rita; Pinos Altos Mountains. Tran- 

 sition Zone. 



4. Hymenopappus flavescens A. Gray, Mem. Amer. Acad. n. ser. 4: 97. 1849. 

 nymenop2)aj}usfisheri Woot. & Standi. Contr. U. S. Nat. Herb. 16: 191. 1913. 

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



by Fendler (no. 464). 

 Range: Western Texas to New Mexico. 

 New Mexico: Near Las Vegas; Vara Nisa. Plains, Upper Sonoran Zone. 



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

 Type locality: New Mexico. 



Range: Western Texas to Arizona. 



New Mexico: Willard; Alamocitas Canyon; Aden; Silver City; Mesilla Valley; 

 Organ Mountains; Roswell. Sandy plains and valleys, in the Lower and Upper 

 Sonoran zones. 



6. Hymenopappus tenuiJolius Pursh, Fl. Amer. Sept. 742. 1814. 

 Type locality: "In Upper Louisiana." 



Range: Nebraska and Arkansas to Texas and New Mexico. 



New Mexico: Raton; Sierra Grande; San Lorenzo; Patterson; Hope. Plains, in 

 the Upper Sonoran Zone. 



7. Hymenopappus nudatus Woot. & Standi. Contr. U. S. Nat. Herb. 16: 191. 1913. 

 Type locality: Burro Mountains, Grant County, New Mexico. Type collected 



by Metcalfe (no. 107). 



Range: Western New Mexico. 



New Mexico: Burro Mountains; west of Patterson; Cactus Flat; Santa Rita; Silver 

 City. Plains and low hills, in the Upper Sonoran Zone. 

 52576°— 15 46 



