WOOTON AND STANDLEY PLOEA OF NEW MEXICO. 709 



74. WYETHIA Nutt. 



Coarse perennial herbs with mostly simple stems, alternate, usually entire leaves, 

 and large heads of yellow flowers; involucre campanulate or hemispheric, the bracts 

 loosely imbricated in 2 or more series, foliaceous; receptacle slightly convex, the 

 chaff lanceolate, equaling and embracing the flowers; rays large, pistillate; achenea 

 elongated, 4 or 5-angled, with coroniform 5 to 10-toothed or laciniate pappus. 



KEY TO THE SPECIES. 



Leaves oblong -lanceolate, tapering to both ends, soft-pubescent; 



bracts equal, in 2 or 3 series; stems not white 1. W. arizonica. 



Leaves linear-oblong, scabrous, not tapering at the ends; bracts very 



unequal, in 5 to 6 series; stems white 2. W. scabra. 



1. Wyethia arizonica A. Gray, Proc. Amer. Acad. 8: 655. 1873. 

 Type locality: Near Bear Springs, northern Arizona. 



Range: Colorado and Utah to Arizona and northern New Mexico. 

 New Mexico: Southeast of Tierra Amarilla (Eggleston 6516). Open slopes in the 

 mountains, in the Transition Zone. 



2. Wyethia scabra Hook. Lond. Journ. Bot. 6: 245. 1847. 



Type locality: "Clayey argillaceous declivities of the high hills of Upper Colo- 

 rado River." 



Range: New Mexico and Colorado to Utah and Wyoming. 



New Mexico: Carrizo Mountains (Standley 7439). Dry hills among rocks, in the 

 Upper Sonoran Zone. 



75. VIGUIERA H. B. K. 



Coarse perennials with chiefly opposite, petioled or sessile, mostly ovate or cordate 

 leaves and large heads on long terminal peduncles; rays bright yellow, showy, 

 sterile; bracts much imbricated, the outer usually foliaceous; achenea pubescent, 

 quadrangular-compressed, not margined nor winged; pappus of 2 awns or paleae, one 

 al each of the principal angles. 



key to the species. 



Disk stongly convex at maturity; leaves thin, all petioled, rounded 



or acute at the base, pubescent; stems much branched 1. V. texana. 



Disk flattish; Leaves thick, the upper sessile or nearly so, subcordate, 



scabrous; stems sparingly branched 2. V. cordifolia. 



1. Viguiera texana Torr. & Gray, Fl. N. Amer. 2: 318. 1842. 

 Type locality: Texas. 



Range: Western Texas to southern Arizona. 



New Mexico: Fort Bayard; Bear Mountains; San Luis Mountains; near White 

 Water; White Mountains; Van Pattens. Thickets and open fields, in the Transition 

 and Upper Sonoran zones. 



2. Viguiera cordifolia A. Gray, PI. Wright. 1: 107. 1852. 



Tvim: i in a i irv: Plains a I l hi ■ base of tin- < iiiadaliipe Mountains. Texas. 



I j am. i Western Texas to southern Arizona. 



Xr« Mi \n o: Mangas Springs; Mogollon Mountains; Fairview; Dog Spring; Organ 

 Mountains; White Mountains: Gray; Sandia Mountains. Dry hills and canyons, in 



the I pper .Sonoran Zone 



