168 BOTANY. 
lucral 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). 
Hymenorurix* Wricutu, Gray (Pl. 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. (763). 
Hymenorurix Wistizenu, 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). 
VILLANOVA + CHRYSANTHEMOIDES, Gray (Pl. Wright. 2, p. 96).—Erect, 
YMENOTHRIX, Gray (P]. Fendl. p. 102).—Head g ori ysl g : 
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 searious or more or less colored; the exterior are shorter and narrower, and slightly, if at 
all, scarious. Receptacle small and naked. 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.ales.—Erect, diffusely 
branching herbs, which are smooth or alittle pilose. Leaves alternate, once or twice pinnately parted or 
the upper ones simple. Heads middle-sized, irregularly paniculate or corymbose. Corollas yellow [or 
purplish].—Brentu. & Hook. 
t VirLaNova, Lagasca.—Heads heterogamous, radiate; ray-and disk-flowers both fertile, or some- 
times the innermost flowers sterile. Involucre campanulate, the few broad herbaceous bracts sub-equal 
subtending the ray-flowers, or even almost embracing their achenia. Small receptacle naked. Ray 
flowers ligulate, the blade small, 3-toothed. Disk-flowers regular, tubular; limb 5-cleft, campanulate. 
Anthers sagittate at base, 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-angled, 
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 
dissec'ed or often only few-lobed. Heads small or middle-sized, peduncled, irregularly paniculate or 
corymbose. Corolla yellow. Achenia smooth.—Benru. & Hook. 
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