ch*:nactis COMPOSITE 357 



HDLSEA 



ligule, not surpassing the disk. Disk-flowers more numerous, 

 their corollas small, with short proper tube, elongated narrow 

 throat and 3-5 short erect teeth. Anthers included. Style- 

 branches with short and linear glabrous stigmatic portion, and 

 larger slender-subulate hispidulous appendage. Pappus nearly- 

 similar in ray and disk, of 3-5 rigid and wholly opaque paleace- 

 ous naked awns, rarely obsolete 



R. leptocladns Gray 1. c Stem slender, 6-12 inches high, paniculately 

 or subcorymbosely branched: branches commonly filiform, elongated and 

 leafless below, smooth, bearing solitary heads: leaves all alternate very 

 narrowly linear, sessile, erect, entire, those of the branches near the heads, 

 small and subulate : involucre 3 lines high : flowers yellow but often chang- 

 ing to purple or whitish : palese of the pappus two-thirds the length of the 

 achene, 3-5, rarely only 2 or 1 or none. Dry plains east of the Cascade 

 Mountains, Brit. Columbia to California. 



65 CH^NACTIS DC. Prodr. v, 659. 



.Herbaceous or rarely surTrutescent plants with alternate most- 

 ly pinnately dissected leaves and pedunculate solitary or some- 

 times cymosely disposed heads of yellow white or flesh-colored 

 flowers. Head discoid, but the marginal flowers commonly 

 with enlarged limb to the corolla. Involucre many-flowered, cam- 

 panulate or hemispherical, its bracts linear, erect, equal, herba- 

 ceous to the tip. Receptacle flat. Corollas with short tube, long 

 and narrow throat, and short teeth ; or in the marginal ones of 

 some species with larger lobes or even imperfect palmate ligules 

 forming a kind of ray. Anthers mostly partly exserted. Style- 

 branches pubescent nearly throughout, filiform or withjattenu- 

 ate-subulate tips. Ppappus of hyaline nerveless palese or none. 



C. Nevii Gray Proc. Am. Acad, xix, 30. Slender wiuter^annual 4-10 

 inches high, puberulent throughout: leaves 6-12 lines long, once or twice 

 pinnately parted into linear-oblong divisions : heads rather short-peduncled: 

 involucre campanulate, 4-6 lines high, of 12-20 lanceolate acute or acum- 

 inate herbaceous bracts : corollas yellow, the marginal ones but little larger 

 than the others : achenes terete, clavate, surmounted by a short and thick 

 obscurely denticulate crown, which is an epigynous disk rather than pap- 

 pus. Near Muddy Station, John Day valley Oregon. 



C. Cusickii Gray Syn. Fl. i, pt. 2, Supp. 452. Very low, diffusely 

 branched, floccose-tomentose, soon glabrate : leaves rather fleshy, all entire, 

 spatulate-linear : peduncles short, : bracts of the involucre broadly linear, 

 midrib obscure : flowers white, the marginal ones enlarged : pappus of 10 

 linear-oblong nearly equal palese about the length of the tube of the corolla. 

 Sandy hills of the Malheur valley, Baker Co, Oregon. 



C. stevioides H. & A. Bot. Beech. 353, Floccose-tomentose. glabrate 

 in age, seldom a foot high, freely and loosely branched, bearing numerous 

 somewhat cymosely disposed heads of white flowers on short slender ped- 

 uncles: leaves once or twice pinnately parted into short linear lobes, the 

 uppermost rarely entire ; bracts of the involucre narrowly linear, obtuse, 

 with obscure midrib: marginal corollas with moderately enlarged unequal- 

 ly 5-lobed limb, not surpassing the disk: paleae of the pappus scarcely 

 thickened at base, those of the inner flowers oblong-lanceolate and shorter 

 than the corolla, of the outer ones ovate or oblong, often unequal, some- 

 times much shorter. Southern Idaho to Nevada and Utah. 



