CHAENACTIS COMPOSITAE 357 



HULSEA 



their corollas small, with short proper tube, elongated riarrdw 

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

 or siibcorymbosely branched : branches commonly fihform, 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 

 changing 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 CHAENACTIS DC. Prodr. v, 659. 



Herbaceous or rarely suflfrutescent plants with alternate mostly 

 pinnately dissected leaves and pedunculate solitary or sometimes 

 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, campanulate or 

 hemispherical, its bracts linear, erect, equal, herbaceous 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 with attenuate-subulate 

 tips. Pappus of hyaline nerveless palese or none. 



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

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

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

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

 acuminate 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 pappus. 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 co- 

 rolla. 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 dfsposed 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 un- 

 equally 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. 



