168 BOTANY. 



literal scales lanceolate, thin, canescent, acutish ; pappus scales oblong, 

 scarious, as long as the tube of the disk-flower, with a strong midrib, which 

 does not reach the apex ; achenia long-cylindrical or clavate, obscurely 

 angled, pubescent. Entire plant densely covered with a close, white 

 tomentum, which may be readily rubbed off. — Camp Grant, Ariz., at 5,300 

 feet altitude (457). 



Hymenothrix* Wkightii, Gray (PI. Wright, 2, p. 97). — Erect, 2-3° 

 high, glabrous, diffusely branched ; lower leaves bi- or tripinnately parted, 

 divisions liliform ; upper ones entire or trifid. with the divisions entire ; 

 involucre loose, inner series broadly hyaline-margined, purple-tipped ; 

 pappus of 12-15 scales, the awn of which is as long or nearly as long as 

 the scale portion. Achenia narrowly turbinate, black, densely silky-vil- 

 lous; rays none. — Camp Grant, Ariz. (763). 



Hymenothrix Wislizenii, Gray (PL Fendl. p. 102). — Erect, puberu- 

 lent, branching; lower leaves bipinnately parted, upper ones trifid or entire; 

 lobes linear or linear lanceolate ; rays bright sulphur-yellow, three-lobed ; 

 disk-flowers merely lobed, yellow; pappus of 12-15 awns, which are bar- 

 bellate above and slightly expanded into hyaline wings below ; achenia 

 whitish and somewhat silky-villous. — Cottonwood, Arizona, at 4,300 feet 

 altitude (350). 



ViLEANOVAf chrysanthemoides, Gray (PI. Wright. 2, p. 96). — Erect, 



* Hymenothrix, Gray (PI. Fendl. p. 102). — Heads heterogarnous, or iu absence of rays boinogamous ; 

 rays wbeu present fertile and in a single series; disk-flowers perfect. Involucre turbinate or narrowly 

 campanulate, the appressed membranaceous bracts in two series, the interior of which have the margins 

 and apices scarious or more or less colored; the exterior are shorter ard narrower, and slightly, if at 

 all, scarious. Receptacle small and naked. Disk-flowers narrowly campanulate and th? limb deeply 

 5-lobed or 5-cleft. Anthers sagittate at base with small auricles. Styles of the disk-flowers with long 

 branches, which are terminated by broad and acute or short subulate appendages. Achenia narrowly 

 turbinate and more or less silky-villous. Pappus of many hyaline, awn-tipped scales.— Erect, diffusely 

 branching herbs, which are smooth or a little pilose. Leaves alternate, once or twice piunately parted or 

 the upper ones simple. Heads middle-sized, irregularly paniculate or corymbose. Corollas yellow [or 

 purplish]. — Benth. & Hook. 



t Villanova, Lagasca. — Heads heterogamous, radiate ; ray- and disk- flowers both fertile, or some- 

 times the innermost flowers sterile. Involucre campanulate, the few broad hirbaceous bracts sub-equal, 

 subtending the ray-flowers, or even almost embracing their achenia, Small receptacle naked. Ray- 

 flowers ligulate, the blade small, :i-toothed. Disk-flowers regular, tubular; limb 5-cleft, campanulate. 

 Anthers sagittate at baso, with small auricles. Styles of disk -flowers having a short acute appendage 

 terminating the branches; achenia cuneate-oblong, truncate, attenuated at base, more or less 3-augled, 

 the exterior strongly and the interior slightly compressed upon the back, smooth, naked. — Diffuse, gland- 

 ular, pubescent herbs. Inferior leaves opposite, sometimes the superior alternate, ternately or pinnately 

 dissee'ed or often only few-lobed. Heads small or middle-sized, pcduucled, irregularly paniculate or 

 corymbose. Corolla yellow. Achenia smooth. — Benth. it Hook. 



