COMPOSITAE. IO07 



X. Hymenopappus Carolinensis (Lam.) Porter. WHITE-BRACTED HYMENO- 

 PAPPUS. (I. F. f. 3960.) Biennial ; stem leafy below, corymbosely branched and 

 nearly naked above, 6-9 dm. high. Basal and lower leaves petioled, 1-1.5 dm. l n g 

 i-2-pinnately parted or deeply pinnatifid into linear or oblong, obtuse or obtusish 

 lobes, more or less white-tomentose beneath; heads commonly numerous, corym- 

 bose, 12-20 mm. broad; bracts of involucre broadly ovate or oval, thin, bright white; 

 corolla lobes about as long as the throat, white; achenes puberulent or pubescent; 

 pappus of very small nerveless scales, shorter than the width of the top of the 

 achene. In dry sandy soil, 111. to Tex., S. Car. and Fla. March-June. 



2. Hymenopappus sulphureus Rydb. SULPHUR-BRACTED HYMENOPAPPUS. 

 Biennial; stem more or less permanently white-tomentose, branched above, 3-6 

 dm. high. Lower leaves pinnately divided into oblong or linear toothed often ob- 

 tuse lobes, white-tomentose beneath, glabrate above; upper leaves twice pinnate 

 with narrower lobes; heads corymbose, about I cm. broad; bracts obovate, their 

 tips light sulphur or almost white; corolla whitish; its lobes as long as the throat; 

 achenes puberulent, short-hairy on the angles; pappus-scales obovate, shorter than 

 the width of the achene. Prairies, Kans. to Tex. Apr.-July. [Type from Riley 

 Co., Kans., J. B. Norton, No. 285.] 



3. Hymenopappus corymbosus T. & G. CORYMBED, OR SMOOTH WHITE 

 HYMENOPAPPUS. (I. F. f. 3961.) Biennial; stem glabrous or nearly so, corym- 

 bosely branched and nearly naked above, 3-6 dm. high. Lower and basal leaves 

 petioled, i-2-pinnately parted into linear or nearly filiform, acute or acutish glabrous 

 lobes, or somewhat tomentose beneath; upper leaves few, much smaller and less 

 divided; heads corymbose, numerous, 8-12 dm. broad; bracts of the involucre 

 obovate to oblong, puberulent, their tips greenish white; corolla white, its lobes 

 about as long as the throat; achenes puberulent; pappus-scales small, nerveless, 

 shorter than the width of the achene. On dry prairies, Neb. to Tex. Summer. 



4. Hymenopappus flavescens A. Gray. WOOLLY YELLOW HYMENOPAP- 

 PUS. (I. F. f. 3963.) Biennial; stem densely white- woolly, at least when young, 

 3-7 dm. high, leafy, branched above. Leaves 1-3 -pinnately parted or divided into 

 linear segments; heads numerous, usually larger than those of the following spe- 

 cies; involucral bracts obovate to ovate with greenish-white margins; corolla yel- 

 low or yellowish, the lobes about equalling the throat; achenes sparingly short- 

 villous; pappus-scales spatulate, shorter than the slender corolla-tube. In sandy 

 soil, Kans. to Tex., Ariz, and northern Mex. 



5. Hymenopappus tenuifolius Pursh. WOOLLY WHITE HYMENOPAPPUS. 

 (I. F. f. 3962.) Biennial; stem lightly tomentose, or at length glabrate, 3-6 dm. 

 high, slender, leafy below, corymbosely branched and nearly naked above. Lower 

 and basal leaves petioled, 1-3 -pinnately parted into linear or filiform lobes, woolly- 

 pubescent beneath, at least when young; heads numerous, corymbose, 8-12 mm. 

 broad; bracts of the involucre obovate-oblong, usually densely tomentose; corolla 

 white, its lobes slightly shorter than the throat; achenes densely villous-pubescent; 

 pappus of several oblong to ovate ribbed or nerved scales, which are about as long 

 as the width of the top of the achene. On dry prairies, S. Dak. to Tex. June-Sept. 



6. Hymenopappus filifolius Hook. Low TUFTED HYMENOPAPPUS. (I. F. 

 f. 3964.) Perennial from a deep woody root; stems usually tufted, woolly when 

 young, sometimes glabrate when old, densely leafy toward the base, usually naked 

 or nearly so above, 1.5-4.5 dm. high. Leaves tomentose when young, the lower 

 and basal ones petioled, i-3-pinnately parted or pinnatifid into narrowly linear, 

 somewhat rigid lobes; heads commonly few, 12-25 mm - broad; bracts of the 

 involucre obovate-oblong, usually densely woolly, their tips whitish ; corolla yellow 

 or yellowish, its lobes much shorter than the throat; achenes densely villous; pap- 

 pus-scales costate. short. On prairies and in dry rocky soil, N. W. Terr, to S. Dak., 

 Neb. and Ariz. June-Sept. 



75. POLYPTERIS Nutt. 



Erect rough, glandular or cinereous herbs, with alternate, mostly entire leaves, 

 or the lower opposite, and corymbose heads of tubular or both tubular and radiate 

 pink or purple flowers. Involucre campanulate or obconic, its bracts in i or 2 

 series, narrow, herbaceous, nearly equal, or with a few exterior shorter ones, 

 appresssd, usually colored. Receptacle small, flat, naked. Ray-flowers, when 



