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CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Rays pale yellow; heads about 7 mm. broad; plants dull 



green, pubescent, usually densely branched 2. H. meamsii. 



Rays bright yellow; heads 5 or 6 mm. wide; plants bright 



green , glabrate , sparing] y branched 3 . E. multiflora . 



Perennials with erect stems and branches; inner bracts usually dif- 

 ferent from the outer, fimbriate; disk corollas not expanded 

 at the mouth. 

 Peduncles and other bracts not cinereous or tomentose, glabrous 

 or nearly so; plants 50 cm. high or more. 

 Leaves entire or with few divisions, the segments linear- 

 oblong or broadly linear; rays mostly equaling the 



involucre 4. E. rusbyi. 



Leaves all much divided, with narrowly linear or filiform 



divisions; rays much shorter than the involucre 5. E. brachjactis. 



Peduncles and outer bracts cinereous or tomentose; plants 

 usually less than 35 cm. high. 



Basal leaves all entire 6. E. olivacea. 



Basal leaves all or mostly divided. 



Inner involucral bracts truncate or obtuse; plants 

 loosely branched almost throughout; corollas 



of the disk flowers long-hairy at the base 7. E. vaseyi. 



Inner involucral bracts acute or acutish, never trun- 

 cate; plants not loosely branched, usually closely 

 corymbose above; disk corollas not long-hairy. 

 Paleae of the pappus abruptly acuminate, with 

 aristiform tips; plants bright green, usually 



tall; heads large, 7 mm. in diameter 8. E. metcalfei. 



Palese of pappus long-attenuate; plants various; 

 heads large or small. 

 Heads large, 8 mm. high, 8 or 9 mm. in diam- 

 eter, few; pappus longer than the 

 achenes, nearly equaling the disk corol- 

 las 9. E. macrantha. 



Heads smaller, 5 or 6 mm. high, numerous; 

 pappus shorter than the achenes, much 

 shorter than the disk corollas 10. E. floribunda. 



1. Hymenoxys cockerellii Woot. & Standi. Contr. U. S. Nat. Herb. 16: 192. 1913. 

 Eymenoxys chrysanthemoides juxta Cockerell, Bull. Torrey Club 31: 503. 1904. 

 Type locality: Mangas Springs, New Mexico. Type collected by Metcalfe (no. 



118). 



Range : Western Texas and southern New Mexico to northern Mexico. 



New Mexico: Mangas Springs; Berendo Creek; Rincon; Mesilla Valley. River val- 

 leys and low plains, in the Lower Sonoran Zone. 



2. Hymenoxys mearnsii (Cockerell) Woot. & Standi. Contr. U. S. Nat. Herb. 16: 



192. 1913. 



Eymenoxys ch-ysanihemoidcs Cockerell, Bull. Torrey Club 31: 506. 1904. 



Type locality: Dog Spring, New Mexico. Type collected by E. A. Mearns (no. 

 142). 



Range: Southern New Mexico and Arizona. 



New Mexico: Lake Valley; Mangas Springs; Dog Spring; San Luis Pass; Cliff; Sil- 

 ver City; Mesilla Valley; Roswell. Plains and dry hills, in the Lower Sonoran Zone. 



