WOOTON AND STAISTDLEY FLORA OF NEW MEXICO. 691 



42. APHANOSTEPHUS DC. 



Slender low annuals or perennials, much branched, with entire to pinnatifid leaves 

 and pedunculate white-rayed heads; bracts broadly lanceolate, well hnbricated; 

 receptacle conic or hemispheric; achenes terete truncate, striate, with low, laciniate 

 or ciliate pappus. 



KEY TO THE SPECIES. 



Perennial; leaves linear 1. A. perennis. 



Annuals or biennials; leaves oblanceolate, oblong-lanceolate, 

 or spatulate, often lobed or toothed. 

 Corolla much thickened at the base in age; pappus con- 

 spicuously dentate or laciniate 2. A. skirrobasis. 



Corolla not thickened at the base; pappus merely a ciliate- 



fringed edge 3. A. ramosissimus. 



1. Aphanostephus perennis Woot. & Standi. Contr. U. S. Nat. Herb. 16: 189. 1913. 

 Type locality: Knowles, New Mexico. Type collected by Wooton, July 29, 1909. 

 Range : Kno^vn only from t^-pe locality, in the Upper Sonoran Zone. 



2. Aphanostephus skirrobasis (DC.) Trel. Rep. Ark. Geol. Surv. 4: 191. 1891. 

 Keerlia skirrobasis DC. Prodr. 5: 310. 183G. 



Egletes arkansanu Nutt. Trans. Amer. Phil. Soc. n. ser. 7: 394. 1841. 



Aphanostephus arkansanus A. Gray, PI. Wright. 1: 93. 1852. 



Type locality: "In Mexico inter Bejar et flum. Trinitas." This is now Texas 

 rather than Mexico. 



Range: Kansas and Arkansas to New Mexico and Mexico. 



New Mexico: Arroyo Ranch {Griffiths 5677, 573(3). Plains and low hills, in the 

 Upper Sonoran Zone. 



3. Aphanostephus ramosissimus DC. Prodr. 5: 310. 1836. 

 Egletes ramosissivia A. Gray, Mem. Amer. Acad. n. ser. 4: 71. 1849. 

 Type locality: "In Mexico circa Bejar et Laredo." This is now Texas. 

 Range: "Western Texas to southern Arizona, south into Mexico. 



New Mexico: North of Santa Fe; McCarthys Ranch; Mesilla Valley; Florida 

 "Mountains; Dog Spring; mountains west of San Antonio; Rincon; Artesia; Roswell. 

 Dry hills and mesas, in the Lower and Upper Sonoran zones. 



43. TOWNSENDIA Hook. 



Annual, biennial, or perennial herbs, often cespitose, caulescent or acaulescent; 

 heads large, with purple or white rays; involucre hemispheric, of numerous large, 

 imbricated, scarious-margined, often purplish bracts; pappus of numerous barbellate 

 bristles, that of the ray flowers shorter or reduced to very short bristles or scales. 



KEY TO THE SPECIES. 



Plants apparently acaulescent 1 . T. exscapa. 



Plants with evident stems. 



Bracts not acuminate; rays whitish. 



Pappus of ray achenes equaUng that of the disk achenes; 



heads 10 to 15 mm. high 2. T. arizonica. 



Pappus of ray achenes much shorter than that of the disk 

 flowers; heads less than 10 mm. high. 

 Perennial, with very short stems; heads usually equal- 

 ed by the leaves , 3. T. incana. 



Annual or biennial with long stems; heads much siu'- 



passing the leaves 4. T. /endleri. 



