WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 713 
80. XIMENESIA Cav. 
Annual, more or less canescent, with alternate petiolate toothed leaves and large 
showy heads of yellow flowers; involucre of spreading linear foliaceous equal bracts; 
disk and receptacle merely convex; rays numerous, large, bright yellow, usually 
fertile; achenes flat, obovate, broadly winged, with short setiform awns, the awns 
not hooked. 
1. Ximenesia exauriculata (Robins. & Greenm.) Rydb. Bull. Torrey Club 33: 
154. 1906. 
Verbesina encelioides exauriculata Robins. & Greenm. Proc. Amer. Acad. 34: 544. 
1899. 
Type Locality: Kansas. 
RanaeE: Kansas and Colorado to Arizona and western Texas and southward. 
New Mexico: Abundant throughout the State. Fields and low hills, from the 
Lower Sonoran to the Transition Zone. 
This is one of the commonest plants of New Mexico, being found in abundance 
almost everywhere except in the highest parts of the mountains and on the driest 
plains. It is nearly always to be seen in cultivated fields and waste ground. In the 
northern part of the State, especially in favorable seasons, it covers large areas of 
ground to the exclusion of almost everything else, presenting a wide unbroken sheet 
of rich yellow. 
81. WOOTONELLA Standley. 
Low perennial, 20 cm. high or less, with slender deep-seated rootstocks; stems 
simple or branched, ascending, canescent; lower leaves opposite, the upper alternate, 
irregularly dentate, narrowed into winged petioles, these mostly dilated and dentate 
at the base; heads 15 to 20 mm. broad, solitary on naked terminal peduncles; bracts 
foliaceous, canescent; rays rather pale yellow, conspicuously exceeding the involucre; 
ray flowers fertile, the disk flowers sterile; pale very narrow, nearly filiform, per- 
sistent; achenes obovate or oblong, villous, broadly winged, the wings corky-thickened 
near the apex; pappus none. 
1. Wootonella nana (A. Gray) Standley, Proc. Biol. Soc. Washington 25: 120. 1912. 
Ximenesia encelioides nana A. Gray, Pl. Wright. 2: 92. 1853. 
Verbesina nana Robinson, Proc. Amer. Acad. 34: 543. 1899. 
Typr Locauity: ‘‘Around the dwellings of Prairie-dogs, between the Limpio and 
the Rio Grande,’’ Texas. 
Rance: Southern New Mexico to western Texas and northeastern Mexico. 
New Mexico: Artesia; Dayton. Plains, in the Lower Sonoran Zone. 
This is said to be a common weed in cultivated fields of the Pecos Valley. 
82. VERBESINA L. CROWNBEARD. 
Coarse annual or perennial herbs with opposite or alternate, petioled or sessile 
leaves and few or numerous small or medium-sized heads of yellow flowers; bracts 
imbricated in 2 or more series, appressed or at least erect, not elongated; receptacle 
convex to conic; rays several or numerous, large and showy, usually sterile; achenes 
flat, glabrous or nearly so; awns of the pappus straight, often obsolete or wanting. 
KEY TO THE SPECIES. 
Leaves elongated-linear......-..-..22-.22-22 20-22 e eee ee eee eee eee 1. V. longifolia. 
Leaves lanceolate to ovate or oblong. 
Leaves thick, sessile, cordate; heads few, 15 mm. in diameter or 
7000) 9: 2. V. rothrockit. 
Leaves thin, petioled, narrowed at the base; heads several to 
many, 12 mm. in diameter or less...........-+-+-020e0eee 3. V. oreophila. 
