446 



COMPOSITAE. 



[Vol. III. 



3. Hymenopappus tenuifolius Pursh. 



Woolly White Hymenopappus. 



(Fig. 3962.) 



Hyme?iopappus tenuifolius Pursh, Am. Sept. 742. 

 1814. 



Biennial; stem lightly tomentose, or at length 

 glabrate, i-2 high, slender, leafy below, cor- 

 ymbosely branched and nearly naked above. 

 Lower and basal leaves petioled, 1-3-pinnately 

 parted into linear or filiform lobes, woolly pu- 

 bescent beneath, at least when young; upper 

 leaves much smaller and less compound; heads 

 numerous, corymbose, 4 // -6 // 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, Nebraska to Texas. June-Sept. 



4. Hymenopappus flavescens A. Gray. Woolly Yellow Hymenopappus. 



(Fig. 3963.) 



Hymenopappus flavescens A. Gray, Mem. Am. Acad. 

 (11)4:97. 1849. 



Biennial; stem densely white- woolly, at least 

 when young, i-2^ high, leafy, branched 

 above. Leaves 1-3-pinnately parted or divided 

 into linear segments; heads numerous, usually 

 larger than those of the preceding species; in- 

 volucral bracts obovate to ovate with greenish 

 white margins; corolla yellow or yellowish, the 

 lobes about equalling the throat, achenes short- 

 villous; pappus-scales spatulate, shorter than 

 the slender corolla-tube. 



In sandy soil, Kansas to Texas, Arizona and 

 northern Mexico. 



5. Hymenopappus filifolius Hook. Low 

 Tufted Hymenopappus. (Fig. 3964.) 



Hymenopappus filifolius Hook. Fl. Bor. Am. 1: 317. 

 1833- 

 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 and sparingly branched above, 

 6 / -i8 / high. Leaves tomentose when young, the 

 lower and basal ones petioled, 1-3-pinnately parted 

 or pinuatifid into narrowly linear, somewhat rigid 

 lobes; heads commonly few, 6 // -i2 // broad; bracts 

 of the involucre obovate-oblong, usually densely 

 woolly, their tips whitish ; corolla yellow or yellow- 

 ish, its lobes much shorter than the throat; achenes 

 densely villous; pappus-scales costate, short. 



On prairies and in dry rocky soil, Northwest Terri- 

 tory to Nebraska and Arizona. June-Sept. 



