230 
* * * Pappus of conspicuous spatulate 1-nerved scales: involucre greener: stems leafy. 
4, H.flavescensGray. Densely white-tomentose: divisions of the leaves narrowly 
torather broadly linear: heads 8 to 10mm. high: involucral bracts roundish-obovate 
or ovate, with greenish-white or yellowish margins: corolla yellow: achenes rather 
short-villous.—Sandy plains and valleys of western Texas. 
5. H. tenuifolius Pursh. Slightly tomentose or glabrate: divisions of the leaves 
narrowly linear or filiform, revolute: heads 6 to 8mm. high: involucral bracts obo- 
vate-oblong, greenish with whitish apex and margins: corolla dull white: achenes 
long-villous.—Extending into Texas from the northern plains, 
87. FLORESTINA Cass. 
Slender leafy-stemmed loosely branched annual (pubescent and above 
beset with stipitate glands), with alternate (except lowest) petiolate 
simply palmately divided or rarely entire leaves, loosely paniculate 15 
to 25-flowered heads of white or flesh-colored flowers, no rays, small 
naked receptacle, 6 to 8 obovate-spatulate equal involucral bracts with 
scarious-colored rounded tips, narrowly obpyramidal 4 or 5-angled pubes- 
cent achenes, and pappus of 6 to 8 obovate pointless scales which are 
very thin scarious from a thickened narrow base or axis. 
1. F. tripteris DC. Lowest leaves commonly ovate or oblong and entire; others 
of 3 oval or oblong or the upper linear leaflets: tips of involucral bracts and flowers 
usually dull white.—Southeastern Texas, in the Lower Rio Grande region. 
88. POLYPTERIS Nutt. 
More or less scabrous-pubescent herbs, with undivided and mostly 
entire petiolate mostly alternate leaves, loosely corymbose or paniculate 
heads of rose-purple or flesh-colored flowers, rays wanting (except in 
one species), spatulate to linear-lanceolate involucral bracts with small 
colored tips, small naked receptacle, slender to narrowly obpyramidal 
4-sided minutely pubescent achenes, and pappus of 6 to 12 equal scales 
with a strong percurrent costa (rarely wanting). 
* Heads 6 to 10mm. high, rayless. 
1. P.callosa Gray. Slender, paniculately branched: leaves linear, slightly petioled : 
involucre 10 to 12-flowered, 6mm. high, of linear-oblong bracts: pappus-scales all 
short, obovate or roundish, the costa seldom reaching the obtuse or erose and retuse 
apex, occasionally minute or wholly wanting. (Has been variously placed under 
Stevia, Florestina, and Palafoxia.)—Low or dry ground, extending from Arkansas into 
northern and central Texas. 
2. P. Texana Gray. Stouter: leaves from lanceolate-linear to lanceolate-oblong, 
distinctly petioled: involucre 20 to 30-flowered, 6 to 10 mm. high, of spatulate-oblong 
bracts: pappus-scales oblong-ovate to oblong-lanceolate, with slender nearly com- 
plete or slightly excurrent costa. (Palafoxia Terana DC.)—River banks of Texas. 
* * Heads 12mm. or more high, with palmately 3-lobed rays. 
3. P. HookerianaGray. Above vlandular-pubescent and somewhat viscid: leaves 
from narrowly to broadly lanceolate: involucre many-flowered, of lanceolate bracts 
in 2 series (outer looser, inner with purplish tips): ray-flowers 8 to 10, with deeply 
3-cleft rose-red rays: ray-pappus a crown of 6 to8short and obtuse rather rigid scales; 
disk-pappus of narrowly lanceolate thin scales traversed by an excurrent costa and 
attenuate at apex into a slender point or shortawn. (Palafoxia Hookeriana Torr, & 
Gray.)—Extending from the sandy plains of the north through Texas into Mexico, 
