Selenium. COMPOSITE. 347 



A. Richardsonii, NUTT. A span to a foot high, in tufts from a multicipital perennial 

 caudex, obscurely puberulent or nearly glabrous, woolly in the axils of radical leaves, fas- 

 tigiately cymose, polycephalous : upper leaves mostly once and lower twice ternately parted 

 into long and simple filiform-linear lobes, rather rigid : involucre campanulate, 2 or 3 lines 

 high, 6-9-augled ; the 6 to 9 bracts of the outer strongly carinate, united for the lower quur- 

 ter or third : rays broadly or sometimes narrowly cuneate, 2 to 4 lines long : palete of the 

 pappus attenuate-acuminate. Trans. Am. Phil. Soc. vii. 379; Tyrr. & Gray, 1. c. ; Gray, 

 PI. Fendl. 101, with var. floribunda, a tall and full-flowered form. Picradenia Richardsonii, 

 Hook. Fl. i. 317, 1. 108. Plains, Saskatchewan and E. Oregon to Utah and New Mexico. 



A. odorata, GRAY. Diffuse and at length much branched from an annual root, a span to 

 2 feet high, with scattered small heads terminating leafy branches : leaves once to thrice 

 ternately parted into filiform lobes, not rigid : involucre campauulate, rigid ; outer of 7 or 8 

 oblong bracts, united at base: paleas of the pappus aristately attenuate. PI. Feudl. 101, 

 PI. Wright, i. 122, & Proc. Am. Acad. xix. 33. Hiimenoxys odorata, DC. Prodr. v. 661 ; 

 Deless. Ic. iv. t. 42. Pkilozera mnltiflora, Buckley, Proc. Acad. Philad. 1861, 459. Open 

 ground, Texas to S. California; also sparingly in Kansas, where it is probably naturalized. 

 (Mex.) 



158. HELENIUM, L. SNEEZE-WEED. (Ancient Greek name of Ele- 

 campane, or some other plant, which was said to be named after the wise Helenus, 

 son of Priam.) N. American and Mexican herbs, erect, mediocre or tall ; witli 

 alternate simple leaves, which are sometimes decurrent, commonly resinous-atom- 

 iferous (therefore bitter-aromatic) and impressed-punctate, and with pedunculate 

 heads of usually yellow or occasionally brownish-tinged flowers, produced in sum- 

 mer or autumn. DC. Prodr. v. 667; Benth. & Hook. Gen. ii. 413, with the 

 synonymy (except Amblyolepis, and adding Hecub(ca) ; Gray, Proc. Am. Acad. 

 ix. 202. Helenium, Leptopoda (Nutt.), and Jfecubcea, DC. Prodr., to which 

 Cephalophora (Cass.), 1, DC., should be added. 



1. OXYLEPIS. Rays fertile, numerous, long and narrow: disk-corollas with 

 moderately long proper tube : pappus of elongated palere : bracts of the involucre 

 numerous in two series, tardily reflexed in fruit: leaves not decurrent on the 

 stem. Gray, Proc. Am. Acad. ix. 205. Dugaldea, Cass. Oxylepis, Benth. PI. 

 Hartw. 87. 



H. Hoopesii, GRAY. Slightly tomentose or pubescent when young, soon glabrate : stem 

 stout, 1 to 3 feet high, from a strong perennial root, leafy, bearing several or sometimes 

 solitary large heads : leaves thickish, entire, oblong-lanceolate, or the lower spatulate with 

 long tapering base, somewhat nervose : rays becoming inch long, tardily reflexed : disk half 

 to three-fourths inch high, hemispherical: receptacle in fruit ovoid-hemispherical: paleas of 

 the pappus ovate-lanceolate, long attenuate-acuminate, a little shorter than the corolla. 

 Proc. Acad. Philad. 1863, 65, Proc. Am. Acad. ix. 205, & Bot. Calif, i. 392. Kocky Moun- 

 tains, Montana to New Mexico, Arizona, and Sierra Nevada, California; first coll. by 

 Thomas Hoopes. 



2. EUHELENIUM. Rays fertile (rarely sterile, occasionally wanting), with 

 cuneate or oblong soon drooping rays : disk-corollas with proper tube very short 

 or reduced to a mere ring : paleas of the pappus not dissected : involucre com- 

 paratively simple and small, of slender linear or subulate often unequal bracts, 

 soon reflexed : plants from glabrous to puberulent, leafy-stemmed, mostly branch- 

 ing. Gray, 1. c. 



* Root annual : leaves all filiform-linear, not decurrent on the stem or branches. 



H. tenuifolium, NUTT. Glabrous, slender, fastigiately much branched, very leafy up to 

 the slender peduncles : leaves mostly entire : rays often half-inch long, much surpassing the 

 globular disk : receptacle depressed-hemispherical (a line and a half in diameter): paleae of 



