506 



COMPOSIT \i: 



Vol. III. 



3. Hymenopappus tenuifolius Pursh. 



Woolly White Hymenopappus. 



Fig- 4531- 



Hymenopappus tenuifolius Pursh. Am. Sept. 742. 1S14. 



Biennial; stem lightly tomentose, or at length 

 glabrate, I-2 high, slender, Italy below, corym- 

 bosely branched and nearly naked above. Lower 

 and basal leaves petioled, 1-3-pinnately parted 

 into linear or filiform lobes, woolly pubescent be- 

 neath, at least when young - , upper leaves much 

 smaller and less compound ; heads numerous, co- 

 rymbose, 4"-6" broad ; bracts of the involucre 

 obovate-oblong, usually densely tomentose ; co- 

 rolla 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 or shorter. 



On dry prairies, South Dakota to Nebraska, Kansas 

 and Texas. June-Sept. 



4. Hymenopappus flavescens A. Gray. 



Wo,olly Yellow Hymenopappus. 



Fig- 453 2 - 



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

 (II) 4: 97. 1849. 



Biennial ; stem densely white-woolly, at least 

 when young, i-2l high, leafy, branched above. 

 Leaves 1-3-pinnately parted or divided into linear 

 segments ; heads numerous, usually larger than 

 those of the preceding species ; involucral bracts 

 obovate to ovate with greenish white margins ; 

 corolla yellow or yellowish, the lobes about equal- 

 ling the throat, achenes short-villous ; pappus scales 

 spatulate, shorter than the slender corolla-tube. 



In sandy soil, Kansas to Texas. Arizona and north- 

 ern Mexico. 



5. Hymenopappus filifolius Hook. Low 

 Tufted Hymenopappus. Fig. 4533- 



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'-l8' high. 

 Leaves tomentose when young, the lower and basal 

 ones petioled, 1-3-pinnately parted or pinnatifid into 

 narro'wly linear, somewhat rigid lobes ; heads com- 

 monly few, 6"-i2" 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; 

 pappus scales costate, short. 



On prairies and in dry rocky soil, Saskatchewan to 

 North Dakota, Montana, Nebraska and Colorado. June- 

 Sept. 



