168 BOTANY. 



lucral scales lanceolate, thin, canescent, acutiah; pappus scales oblong, 

 Bcarious, as long as the tube of the disk-flower, with a Btrong midrib, which 

 does nol reach tin- apex: achenia long-cylindrical or clavate, obscurely 

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



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

 feel altitude (457). 



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

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

 divisions filiform; 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. (703). 



Hymenothrix Wislizenii, Gray (PI. Fend! 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). 



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



* IIv.MEXoTinux, Gray (PI. Fcndl. p. 102). — Heads beteroganions, or iu absence of rays homogamous : 

 rays when 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 atd narrower, and slightly, if at 

 all, scarious. Receptacle small and Daked. Disk-flowers narrowly campanulate and the 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 s«.nles. — Erect, diffusely 

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

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

 purplish].— Berth. »fc Hook. 



t Yii.i.anova, Lagasca. — Heads beterogamons, radiate; ray- and disk-flowers both fertile, or aome- 

 times the innermost (lowers sterile. Involucre campanulate, the few broad herbaceous bracts sub-equal, 

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

 flowers ligulate, the blade small, 3-toothed. Disk-flowers regular, tubular; limb o-cleft, campanulate. 

 Anthers sagit ate at base, with small auricles. Styles of diskllow ers having a short acute appendage 

 terminating the branches; achenia cuucate-oblong. truncate, attenuated at base, more or less 3-angled, 

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

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

 dissec ed or often only fewlobcd. Heads small or niiddle-si/ed, peduncled, irregularly paniculate or 

 Corymbose. Corolla yellow. Achenia smooth.— Him ii A BOOK. 



