229 
84. SCHKUHRIA Roth. 
Slender and paniculately much branched annuals, with alternate (or 
lower opposite) pinnately 3 to 7-parted (or uppermost entire) impressed- 
punctate leaves with filiform divisions and rhachis, small pedunculate 
effusely paniculate 3 to 5-flowered heads of yellow (rarely purplish) 
flowers, clavate involucre of 4 or 5 erect bracts with scarious purple- 
tinged tips, single ray-flower or none, obpyramidal achenes with very 
densely long-villous angles, and pappus of 8 searious scales. 
1. S. Wrightii Gray. Pappus shorter than the corolla, its scales all obovate 
and obtuse or erose-truncate, destitute of costa.—Limpia Cation, southwestern Texas 
(Nealley). 
85. HYMENOTHRIX (ray. 
Glabrous or somewhat pubescent herbs, with alternate leaves once 
to thrice parted into linear divisions, numerous corymbosely cymose 
many-flowered heads, no rays (in ours), 7 to 10 obovate or lanceolate- 
oblong thin involucral bracts half or more scarious-petaloid, small 
naked receptacle, top-shaped achenes with a slender base, and pappus 
of 12 to 20 narrow lanceolate very thin scales traversed by a strong 
costa which is excurrent into a scabrous awn. 
1. H. Wrightii Gray. Leaves with very narrow linear or almost filiform divisions, 
the lower cauline hirsute: involucre of obovate-oblong and very obtuse purple-tinged 
bracts (a few smaller narrow accessory ones): disk-corollas white or purplish: 
achenes villous.—Chenate Mountains, southwestern Texas (Nealley). 
86. HYMENOPAPPUS L’Her. 
Biennial or perennial herbs, with alternate mostly dissected leaves, 
corymbed small many-flowered heads of usually whitish flowers, no 
rays, 6 to 12 loose and broad thin involucral bracts with the upper part 
petal-like (usually white), small naked receptacle, top-shaped striate 
achenes with slender base, and pappus of 15 to 20 very thin blunt 
scales in a single row. 
* Pappus of very small roundish nerveless scales: involucre partly white-petaloid. 
1. H. scabioseus L’Her. Somewhat flocculent-woolly when young, leafy to the 
top: leaves 1 to 2-pinnately parted into linear or oblong lobes: involucral bracts 
roundish, mainly whitish. Extending into Texas from the sandy pine-barrens of the 
Gulf States. 
2. H. corymbosus Torr. & Gray. More slender, glabrate, naked above: involu- 
cral bracts obovate-oblong, petaloid at apex.—Extending into Texas from the north- 
ern prairies. 
** Pappus of larger spatulate-obovate scales partly traversed by a thickened axis or 
obscure costa: involucre half whitish. 
3. H. artemisizfolius DC. Pannosely or somewhat floccosely white-tomentose: 
leaves from simply pinnatifid or lyrately few-lobed (sometimes entire) to bipinnately 
parted into linear-oblong lobes.—Southern Texas. 
