720 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
KEY TO THE SPECIES. 
Lobes of the disk corollas short, obtuse; leaves mostly pinnatifid... 1. G. pinnatifida. 
Lobes of the disk corollas narrow, acute; leaves mostly entire... .. 2. G. pulchella. 
1. Gaillardia pinnatifida Torr. Ann. Lyc. N. Y. 2: 214. 1828. 
Tyrer Locauiry: ‘On the Canadian ?,’’ Colorado or New Mexico. 
RanGeE: Colorado to Arizona and Texas. 
New Mexico: Nearly throughout the State. Plains and low hills, in the Lower 
and Upper Sonoran zones. 
2. Gaillardia pulchella Foug. Mém. Acad. Sci. Paris 1786: 5. pl. 1, 2. 1788. 
TYPE LocaLity: ‘‘Louisiane.”’ 
RanGE: Arizona to Arkansas and Louisiana. 
New Mexico: Pajarito Park; Mogollon Mountains; Nutt Mountain; Burro Moun- 
tains; Animas Valley; Organ Mountains; Buchanan; south of Torrance; Nara Visa; 
Roswell. Plains and hills, in the Upper Sonoran Zone. 
98. SCHKUHRIA Roth. 
Slender, paniculately much branched annual with alternate leaves pinnately 
parted into filiform divisions and small pedunculate heads of yellow or purplish flow- 
ers; involucre turbinate, of 4 or 5 erect scarious-tipped bracts, 3 to 9-flowered; achenes 
obpyramidal, the pappus of 8 scarious pales. 
1. Schkuhria wrightii A. Gray, Pl. Wright. 2: 95. 1853. 
Type Loca.ity: ‘‘On the Sonoita near Deserted Rancho, Sonora.’’ 
Rance: Southern New Mexico and Arizona and adjacent Mexico. 
New Mexico: Trujillo Creek; Organ Mountains. Moist canyons, in the Upper 
Sonoran Zone, 
99. HYMENOPAPPUS L’Her. 
Perennial or biennial herbs with angled erect stems, alternate, once or twice parted 
or entire leaves, and corymbose or solitary, pedunculate heads of yellow or whitish 
flowers; rays wanting except in one species; involucres campanulate, many-flowered, 
of 6 to 12 appressed bracts with scarious tips; achenes obpyramidal, 4 or 5-angled, the 
faces 1 to 3-nerved; pappus of 10 to 20 hyaline obtuse scales. 
KEY TO THE SPECIES. 
Rays present. .. 2.2.2... cece ee eee eee eee cee ee eee eee 1. H. radiatus. 
Rays wanting. 
Basal and lower cauline leaves entire........................ 2. H. integer. 
Basal and cauline leaves, at least most of them, pinnate or 
pinnatifid. 
Divisions of the leaves broadly linear to oblong or lanceo- 
late. 
Corollas whitish; stems nearly naked................ 3. HH. mexicanus. 
Corollas bright yellow; stems very leafy. ............ 4. H. flavescens. 
Divisions of the leaves linear or filiform. 
Stems very leafy throughout. 
Plants permanently and densely tomentose; lobes 
of the corolla nearly equaling the throat... 5. H. robustus. 
Plants glabrate in age, thinly tomentose when 
young; lobes of the corolla much shorter 
than the throat... .......-.---.-.-.----- 6. H. tenuifolius, 
Stems scapose or the leaves much reduced and few. 
Heads 12 to 15 mm. in diameter; stems nearly 
naked, bearing only 1 or 2 much reduced 
leaves; stems densely arachnoid, tall...... 7. H. nudatus. 
