728 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Rays pale yellow; heads about 7 mm. broad; plants dull 
green, pubescent, usually densely branched........ 2. H. mearnsii. 
Rays bright yellow; heads 5 or 6 mm. wide; plants bright 
green, glabrate, sparingly branched................. 3. H. multiflora, 
Perennials with erect stems and branches; inner bracts usually dii- 
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................ wee eee ee ee eee eee eee eee 4. H. rusbyi. 
Leaves all much divided, with narrowly linear or filiform 
divisions; rays much shorter than the involucre.... 5, H. brachyactis. 
Peduncles and outer bracts cinereous or tomentose; plants 
usually less thar 35 cm. high, 
Basal leaves all entire..... 2.2.22... 00. cece ce cee eeeceece 6. H. 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. H. vaseyi. 
Inner involucral bracts acute or acutish, never trun- 
cate; plants not loosely branched, usually closely 
corymbose above; disk corollas not long-hairy. 
Pale of the pappus abruptly acuminate, with 
aristiform tips; plants bright green, usually 
tall; heads large, 7 mm. in diameter....... 8. H. metcal fei. 
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- 
a 9. H. macrantha. 
Heads smaller, 5 or 6 mm. high, numerous; 
pappus shorter than the achenes, much 
shorter than the disk corollas......... 10. H. floribunda, 
1, Hymenoxys cockerellii Woot. & Standl. Contr. U. 8. Nat. Herb, 16: 192. 1913. 
Hymenoxys chrysanthemoides juxta Cockerell, Bull. Torrey Club 81: 503. 1904, 
TYPE Locality: Mangas Springs, New Mexico. Type collected by Metcalfe (no. 
118). 
RanaGeE: 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. & Standl. Contr. U. 8. Nat. Herb. 16: 
192. 1913. 
Hymenoxys chrysanthemoides Cockerell, Bull. Torrey Club 81: 506. 1904. 
Tyre Locauity: Dog Spring, New Mexico. Type collected by E. A. Mearns (no. 
142), 
Ranae: 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. 
