Hduiium. COMPOSIT.E. 347 



A. Riohardsonii, Xi-tt a .,,an to a foot high, fn tufts from a mnltidpital perennial 

 cau.lex, ol.sciuely puberulent or Bc.rly glabrous, woolly in the axils of radical leav.. f ,.- 

 ti-iatcly cymose, polycephalous : upper leaves mustly once and lo^ver t.vice ternatelv parted 

 into long and M.nple filiform-linear lobes, ratlier rigid : involucre campanulate, ■> or 3 lii-s 

 higli, b-y-a.igled ; the 6 to 9 bracts of tlie outer struiigly eariuate, united for the lo«er cmur- 

 ter or tliird : rays broadly or sometimes narrowly cuueate, -1 to 4 lines long : palea; of the 

 pappus attenuate-acuminate. — Trans. Am. Phil. Sue. vii. .379; Torr & (Jrav 1 c • Grav 

 PI. Fendl. 101, with var. floribmda, a tall and full-flowered form. Picradmia 'lluhdrdsomi, 

 Hook. 11. 1. 31,, 1. 108.— Plains, Sa^katrlien-an aud E. Oregon to Utah and Xew ."Mexico. 



A. Odorata, Gr.iy. Diffuse aud at length much branched from an aunual root, ii span to 

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

 teruately parted into filiform lobes, not rigid : involucre campanulate, rigid ; outer of 7 or 8 

 oblong bracts, united at base: pale;ii of the pappus aristately attenuate. —PI. Fendl. 101, 

 PI. Wright, i. 122, & Proc. Am. Acad. xix. 33. Ili/menoxi/s' odorata, DC. Prodr. v. 661; 

 Deless Ic. iv. t. 42. P/u'lozera multlflora, Buckley, Proc. Acad. Philad. 1861, 4.59. — Open 

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

 (Jlex.) 



158. HELifiNIUM, L. Sxeeze-ayeed. (Ancient Greek name of Ele- 

 campane, or some other plant, which was said to be named after the wi.^e Hdeam, 

 sou of Priam. ) — N. American and JMexican herb.?, erect, mediocre or tall ; with 

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

 iferoiis (therefore bitter-aromatic) and impressed-punetate, and with pedunculate 

 heads of usualh- yellow or occasionally brownish-tinged flowers, produced in snic- 

 mer or autumn. — DC. Prodr. v. G07 ; Benth. & Hook. Gen. ii. 413. with the 

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

 ix. 202. Heleiiium, Leptopoda (Xutt.), and Hecubcsa, DC. Prodr., to which 

 Cephahphora (Cas.i.j, § 1, DC, should be added. 



§ 1. Oxi'LEPis. Pays fertile, numerous, long and narrow: disk-corollas with 

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

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

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

 Hartw. 87. 



■ H. Hoopesii, Gkat. 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 thickisli. 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-heraispherical : paleae of 

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

 Proc. Acad. Philad. 1SG3, 65, Proc. Am. Aiad. ix. 205, & Bot. Calif, i. .392. — Rocky ifoun- 

 taiiis, ;Montana to Xew 31exico, Arizona, and Sierra Xevada, California; first coll. by 



Tlnjnnis lluOjtfS. 



§ 2. Et'HELEXiu^i. Pays 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 : paletie 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. 



* Rout annual : leaves all fill form -linear, not decurrent on the stem or branches. 



■ H. tenuifolium, Xutt. 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 iu diameter) : palese of 



