268 



CICHORIACEAE. 



[Vol. Ill, 



2. Ptiloria tenuifolia (Torr. ) 



Raf. White-plumed Ptiloria. 



(Fig. 3527.) 



Prenanthes? tenuifolia Torr. Ann. I,yc. 2: 

 210. 1828. 



Ptiloria tenuifolia Raf. Atl. Journ. 145. 1832. 



Lygodesmic minor Hook. Fl. Bor.Am. 1: 205. 



pi. 103 A. 1833. 

 Stephanomeria minor Nutt. Trans. Am. Phil. 



Soc. (II) 7: 427. 1841. 



Similar to the preceding species, but 

 commonly lower, bushy-branched, the 

 branches ascending. Basal leaves runci- 

 nate-pinnatifid, those of the stem linear 

 or filiform, entire, or sometimes runcinate- 

 dentate, the uppermost reduced to small 

 scales; heads numerous, usually solitary 

 at the ends of the branchlets; involucre 

 about \" high; pappus bright white, very 

 plumose to the base. 



Plains and dry, rocky soil, Northwest Terri- 

 tory to western Nebraska and Texas to Brit- 

 ish Columbia, Arizona and California. May-- 

 Aug. 



i. Ptiloria pauciflora (Torr.) 



Raf. Brown-plumed Ptiloria. 



(Fig. 3526.) 



Prenanthes? pauciflora Torr. Ann. I,yc. N. 

 Y. 2: 210. 1827. 



Ptiloria pauciflora Raf. Atl. Journ. 145. 1832. 



Stephanomeria rundnata Nutt. Trans. Am. 

 Phil. Soc. (II) 7:427. 1841. 



Perennial; stem rather stout, striate, 

 rigid, divergently branched, i-2 high. 

 Basal and lower leaves runcinate-pinnati- 

 fid, i / -2^ / long, $"-(>" wide, the upper 

 all short and narrowly linear or reduced 

 to scales; heads somewhat racemose-pan- 

 iculate along the brauches, usually about 

 5-flowered; involucre \"- ,f high; rays 

 i // -2 // long; pappus brownish, plumose 

 to near the base. 



Plains, Nebraska and Wyoming to Texas 

 and California. Summer. 



10. TRAGOPOGON L. Sp. PI. 789. 1753. 



Biennial or perennial, erect usually branched, somewhat succulent herbs, with slender 

 fleshy tap-roots, alternate entire linear-lanceolate long-acuminate leaves, clasping at the 

 base, and long-peduncled large heads of yellow or purple flowers, opening in the early 

 morning, usually closed by noon. Involucre cylindric or narrowly campanulate, its bracts 

 in 1 series, nearly equal, acuminate, united at the base. Rays truncate and 5 toothed at the 

 apex. Anthers sagittate at the base. Style-branches slender. Achenes linear, terete, or 

 5-angled, 5-10-ribbed, terminated by slender beaks ; or the outermost beakless. Pappus- 

 bristles in 1 series, plumose, connate at the base, the plume-branches interwebbed. [Greek, 

 goats-beard.] 



About 35 species, natives of the Old World. 



Flowers j'ellow; involucral bracts equalling or shorter than the rays. I. T. pralensis. 



Flowers purple; involucral bracts much longer than the rays. 2. T. porrifolius. 



