[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 cylindric 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 1 series of rather rigid plumose bristles. [Greek, referring to the feathery pappus.1

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.

1. P. pauciflora.

Involucre about 4 high; pappus white, plumose almost to the base.

2. P. ramosa.

11 Ptiloria Raf Atl Journ 145 1832 727

1. 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.

Stephanomeria runcinata Nutt. Trans. Am. Phil. Soc. (II.) 7: 427. 1841.

Perennial; stem rather stout, striate, rigid, divergently branched, 1°-2° high. Basal and lower leaves runcinate-pinnatifid, 1 '-21/2' 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 1"-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. Gard. •1: 453- 1900.

Similar to the preceding species, but commonly lower, bushy-branched, the branches ascending. Basal leaves runcinate-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 4" high; pappus bright white, very plumose to near the base.

Plains and dry, rocky soil, western Nebraska to Wyoming, Montana and Colorado. In first edition of this work not distinguished from the western Ptiloria tenuifolia (Torr.) Raf. May-Aug.

2 Ptiloria Ramosa Rydb White Plumed Ptiloria 728