312 



CICHORIACEAE. 



VOL. III. 



ii. PTILORIA Raf. Atl. Journ. 145. 1832. 

 [STEPHANOMERIA Nutt. Trans. Amer. Phil. Soc. (II.) 7: 427. 1841.] 



Annual or perennial, mostly glabrous, often glaucous herbs, with erect, simple or branched, 

 usually rigid stems, alternate or basal, entire dentate or runcinate-pinnatifid leaves, those of 

 the stem and branches often reduced to subulate scales, and small erect heads of pink flowers, 

 paniculate, or solitary at the ends of the branches, opening in the morning. Involucre cylin- 

 dric or oblong, its principal bracts few, equal, scarious-margined, slightly united at the base, 

 with numerous short exterior ones and sometimes a few of intermediate length. Receptacle 

 flat, naked. Anthers sagittate at the base. Style-branches slender. Achenes oblong or 

 linear, terete or columnar, 5-ribbed, truncate or beaked at the summit, the ribs smooth or 

 rugose. Pappus of i series of rather rigid plumose bristles. [Greek, referring to the 

 feathery pappus.] 



About 20 species, natives of western and central North America. Type species : Ptiloria 

 pauciflora (Torr.) Raf. 



Involucre about 5" high; pappus brownish, plumose to below the middle. i. P. pauciflora. 



Involucre about 4" high ; pappus white, plumose almost to the base. 2. P. ramosa. 



i. Ptiloria pauciflora (Torr.) Raf. 

 Brown-plumed Ptiloria. Fig. 4056. 



Prenanthes? pauciflora Torr. Ann. Lye. N. Y. 

 2: 210. 1827. 



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



Stcphanomeria runcinata 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-pinnatifid, 

 i'-2i' long, 3"-6" wide, the upper all short 

 and narrowly linear or reduced to scales ; 

 heads somewhat racemose-paniculate along 

 the branches, usually about 5-flowered ; 

 involucre 4"-s" high; rays i"-2" long; 

 pappus brownish, plumose to below the 

 middle. 



Plains, Nebraska, Kansas to Wyoming, 

 Texas and California. Summer. 



2. Ptiloria ramosa Rydb. White- 

 plumed Ptiloria. Fig. 4057. 



Ptiloria ramosa Rydb. Mem. N. Y. Bot. Card, 

 i : 453- 1900. 



Similar to the preceding species, but com- 

 monly lower, bushy-branched, the branches 

 ascending. Basal leaves runcinate-pinnati- 

 fid, 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 4" high ; 

 pappus bright white, very plumose to near 

 the base. 



Plains and dry, rocky soil, western Ne- 

 braska to Wyoming, Montana and Colorado. 

 In first edition of this work not distinguished 

 from the western Ptiloria tenuifolia (Torr.) 

 Raf. May-Aug. 



