Eymeiwpappus. COMPOSIT.E. 335 



102, & PI. Wright, ii. ei7; Eothrock in "Wheeler Eep. vi. 16».— Eiver-bottom;, &c., S.Arizona 

 and Xew Mexico; first coll. by Wi.Jr.fims. (Adj. Me.x.) 

 "H. Wrightii, Gray. Leaxes with very narrow linear or almost filiform divisions, the 

 lower cauline hir.-ute : heads broader: involucre of obovate-oblong and very ol.tu.ie purple- 

 tinged bracts, and a few siiKtUor narrow acce.s>ory uues : rays none : disk-corolla- white or 

 purplish, 5-parted almost down to the narrow tube into obloug-linear widely sprt-adiucr lobes : 

 style-tips with a .-leud.;r--aliulate cusp: akenes broader, vilIou> : pappns of broader paleae 

 and smoother awned ti|i§ — PI. Wriirht. ii. 97; Torr. in ^itsreaves i;.-p. t. 6: Piuthrock, 

 1. c.^.Vlung streams, ^. Arizona, WrUjId, ThurUr, &c. (Lower California, Or< fiit.) 



148. HYMENOPAPPUS, L'Her. (From r/.,;,-. membrane, ^ivnTo^. 

 pappui. the latter of hyaline paleee.) — Xorth American and North Mexican 

 herbs (chiefly of the pruirits and plain.sj, perennial, biennial, or some perhaps 

 winter annuals, mostly floccose-tomentose and with sulcate-an^'led erect -tems. 

 alternate 1-2-pinnatifid or parted leaves, the lower sometimes entire, and corvm- 

 bosely cymose or solitary pedunculate middle-sized heads of white or yellow 

 flowers. Lea\'es in some species evidently impressed-punctate. When the corolla 

 is deeply cleft the nerves of its lobes are deeply intramarginal. Fl. spriui;'. — 

 •• L'Her. Di-~. cum icon." ; Michx. Fl. ii. 103 ; Cass. Diet. Iv. 266, -M'J ; DC. 

 Prodr. V. C.5d : Gray, Proc. Am. Acad. xix. 20. 



* Lobes of the white corolla as long as the short -campanulate or crateriform throat; the tube long 

 and slender, much ex'-eeding the ?linrt pappus: stamens with even the filaments mo^tly exserted; 

 akenes merely pubescent, clavate-^jbpyramidal, with much thickened summit and stipitiform 

 ba^e : involucre of comparatively lax and partly white-petaloid bracts : heads corrmbiforra- 

 cymose and rather numerous, on short peduncles: comparatively Eastern species, biennials, 

 1 to -3 feet high. 



^— Pappus of verv- small obovate or roundish nerveless paleae forming a cro\vn, much shorter than 

 the breadth of the summit of the merely pubescent akene, often minute, even obsolete: ric'ccose 

 or pannose tomentum thin, sometimes deciduous. 



H. scabiossetlS, L'Hee. Leafy to the top, thinly tomentose : radical leaves pinnately 

 parted or occasionally entire, cauline irregularly 1-2-pinnately parted into broadly or nar- 

 Towlv linear lobe^ : heads about 5 lines hi^'h : the broad involucre suniewhat radiate-expanded, 

 its mainlv wliite bracts roundish-oljovate, at first surpassinic the disk : akenes short^pabescent. 

 — Mich.x. Fl. ii. 104; Torr. & Gray, Fl. iL .372. Ibjtlua C-mjIinensis, Lam. Jour. Hist. Xat. 

 i. 16 t. 1, & 111. t. 667. — Sau'ly pine-barrens, JDddle Florida to S. Carolina, and west to 

 Illinois and Texas. 



H. COrymbosUS, Toek. & Geat. ilore slender, smaller, and glabrate, naked above : 

 lower leaves 2-]jinnately and the small upper ones mostly simply parted into narrowly linear 

 acute divisions and lobes : heads .3 or 4 lines high: bracts of the involucre much smaller, 

 shorter than the flowers, obovate-oblong, the petaloid summit only greenish-white: akenes 



pnberulent. Fl. ii. -372. — Prairies, Nebraska to Arkansas and Texas. The var. Xuttallii, 



Torr. & Grav, as to plant in herb. Torr., belougs here, but the H. tenuifoUus of Xnttall in 

 other herbaria i> Pursh's species. 



^_ ^_ Pappus of larger spatulate-obovate palese, in length nearly equalling the breadth of the 

 summit of the viUous-pubescent akene, partly traversed by a callous-ihickened axis or obscure 

 costa. 



H. artemisiEefolius EC. Pannosely or somewhat floccosely white-tomentose, or some- 

 what denudate in age: leaves from sim|.ly pinnatifid or h-rately few-lobed, and sometimes 

 quite entire (lanceolate or oblons), to bipinnately parted into broadly linear or narrowdy 

 oblono- obtuse divisions and lobes: heads 4 lines high: bracts of the involucre obo\ate- 

 oblons. about equaUiiis the di~k-flower,. dull white, lower half green. — Prodr. v . 6.5S : Torr. 

 & Grav, Fl. ii. 372. — Texas ; first coll. by Berlandier. 



* # Lobes of the corolla more or le-s shorter than the throat: pappus conspicuous, of spatulate or 

 narrow palese, which have a manifest costa or thicker opaque axis, this evanescent near or beluw 

 the obtuse or retuse apex : akenes villous : involucre greener, less petaloid. 



