228 
divisions which are 8 to 5-parted, the ultimate segments mostly cuneate and 3-lobed: 
achenes pubescent on the faces, hispid-villous on the margins: awn of the pappus as 
long as the achene,—Chisos Mountains, southwestern Texas (Nealley). 
+ + Rays barely 4mm. long or none: disk-corollas slender, with long and narrow throat, 
3. P. ParryiGray. Minutely pubescent and obscurely viscid : leaves reniform-cor- 
date, crenately dentate and often lobed: rays barely 4mm. long: achenes strongly 
hirsute-ciliate: awn of pappus nearly equaling disk-corolla,—Cafions of south- 
western Texas (Parry and Havard). 
4. P. aglossa Gray. Somewhat puberulent, obscurely viscid: leaves roundish, 
with subcordate or truncate base, mostly 3 to 5-cleft and coarsely dentate: involu- 
eral bracts very narrowly linear: rays none: achenes with rather short and dense 
hirsute ciliation: awn of pappus equaling disk-corolla.—With or near the pre- 
ceding (Parry). 
83. BAHTA Lag. 
Suffruticose or mostly herbaceous plants, with opposite or sometimes 
alternate leaves, small or middle-sized pedunculate heads of yellow 
flowers (all fertile) terminating the branches, many- (at least 12 to 20-) 
flowered involucre with herbaceous uncolored bracts lax or open in fruit, 
small mostly flat receptacle, narrow quadrangular achenes, and pappus 
(rarely wanting) of several scarious scales with thickened base which 
is sometimes extended into a strong midnerve. 
* Leaves mainly opposite, pedately (sometimes pinnately) dissected or cleft: pappus of 
broad very obtuse scales scarious above and thickened at base. 
1. B. absinthifolia Benth. Diffusely branched tomentulose-canescent perennial, 
with sparsely corymbose-paniculate heads on slender peduncles: leaves 3 to5-parted 
into narrowly linear or lanceolate divisions and lobes: rays 9 to 12: achenes slender, 
pubescent: pappus nearly equaling the proper corolla tube.—A species of Mexico 
and Arizona, collected near Rio Grande City (Nealley). Var. DEALBATA Gray, of the 
dry plains of western Texas, is more whitened with fine pannose tomentum, and with 
less divided leaves commonly only 3-cleft into lanceolate or linear-oblong lobes, or 
some lower ones oblong-lanceolate and entire. 
2. B. Bigelovii Gray. Diffuse strigose-puberulent annual: leaves 3-parted and 
the divisions sometimes 2 or 3-parted into linear-filiform segments and lobes: pe- 
duncles elongated and filiform: involucral bracts viscidly hirsute: rays 8 or 9: 
achenes mostly hirsute along the slender attenuate base: pappus half the length of 
the corolla-tube.—In the valley of the Limpia, southwestern Texas. 
** Leaves all or mostly alternate, 2 or 3-ternately divided or parted : heads loosely cymose- 
paniculate at the naked summit of the erect stems: pappus of oblong to narrowly 
lanceolate scales with a distinet midrib (costa), 
3. B. pedataGray. Cinereous-puberulent : leaves pedately divided, commonly into 
3 petiolulate obovate or cuneate segments, of which the lateral are 2-parted and the 
middle 3 to 7-lobed; lobes obovate or broadly oblong: heads 10 mm. high: involu- 
eral bracts oblong: rays about 12, oblong: scales of pappus 10 to 12, spatulate-ob- 
long, with costa vanishing near the obtuse or retuse summit.—Southwestern Texas, 
beyond the Pecos. 
4. B. biternata Gray. More pubescent and slender: leaves biternately dissected 
into linear and obtuse (or spatulate) segments, the primary ones slightly petiolulate: 
heads 8 mm. high: involucral bracts obovate: rays 8 or 10, broadly obovate: scales 
of pappus 12 to 14, longer and narrower; those of outer flowers obovate and with 
costa vanishing below the apex; of inner ones longer, elongated-lanceolate and 
with costa excurrent into an awn-like cusp.—Borders of western Texas. 
