Hyme7iopappus. COMPOSITiE. 335 



102, &P1. AVright. ii. 97 ; Rothrock in Wheeler Rep. vi. 168. — River-bottoms, &c., S.Arizona 

 and New jMexico; first coll. by Wislizeniis. (Adj. Mex.) 

 H. Wrightii, Gkay. Leaves with very narrow linear or almost filiform divisions, the 

 lower cauliue hirsute : heads broader : involucre of obovate-oblong and very obtuse purple- 

 tinged bracts, and a few smaller narrow accessory ones : rays none : disk-corollas white or 

 purplish, 5-parted almost down to tlie narrow tube into oblong-linear widely spreading lobes : 

 style-tips with a slender-subulate cusp : akenes broader, villous : pappus of broader paleai 

 and smoother a wned tips. — PI. Wright, ii. 97; Torr. in Sitgreaves Ilep. t. 6; Rothrock, 

 1. c. — Along streams, S. Arizona, Wright, Thurber, &c. (Lower California, Orcutt.) 



148. HYMENOPAPPUS, L'Her. (From i,x^v, membrane, Tro^TTTros, 

 ]):ippus, the latter of hyaline palca^.) — North American and North Mexican 

 herbs (chiefly of the prairies and plains), perennial, biennial, or some perhaps 

 winter annuals, mostly floccose-tomentose and with sulcate-angled erect stems, 

 alternate 1-2-pinnatilid or parted leaves, the lower sometimes entire, and corym- 

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

 (lowers. Leaves in some species evidently impressed-jjunctate. AVlien the corolla 

 is deeply cleft the nerves of its lobes are deeply intramarginal. Fl. spring. — 

 "L'Her. Diss, cum icon."; Michx. Fl. ii. 103; Cass. Dic^. Iv. 266, 279; DC. 

 Prodr. V. 658 ; Gray, Proc. Am. Acad. xix. 29. 



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

 and slender, much exceeding the short pappus : stamens with even the lilaments mostly exserted : 

 akenes merely pubescent, clavatc-obpyramidal, with much thickened summit and stipitiform 

 base: involucre of comparatively lax and partly white-petaloid bracts: heads corymbiform- 

 cj-mose and rather numerous, on short peduncles: comparativelv Eastern species, biennials, 

 1 to 3 feet high. 



•i— Pappus of very small obovate or roundish nerveless pale<-e forming a crown, much shorter than 

 the breadth of the summit of the merely pubescent akeue, often minute, even obsolete: floccoso 

 or pauuose tomentum thin, sometimes deciduous. 



H. SCabioseeus, L'IIer. Leafy to the top, tiiinly tomentose : radical leaves pinnately 

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

 rowly linear lobes : heads about 5 lines iiigh : the broad involucre somewhat radiate-expanded, 

 its mainly white bracts roundish-obovate, at first surpassing the disk : akenes short-pubescent. 

 — Michx. n. ii. 104; Torr. & Gray, Fl. ii. 372. Rotkia Carolinensis, Lam. Jour. Hist. Nat. 

 i. 16, t. 1, & 111. t. 667. — Sandy pine-barrens. Middle Florida to S. Carolina, and west to 

 Illinois and Texas. 



H. COrymbosUS, Torr. & Gray. More slender, smaller, and glabrate, naked above : 

 lower leaves 2-pinnately 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 

 puberulent. — Fl. ii. 372. — Prairies, Nebraska to Arkansas and Texas. The var. NuttalUi, 

 Torr. & Gray, as to plant in herb. Torr., belongs here, but the //. tenuifuUus of Nuttall in 

 other herbaria is Pursh's species. 



H— -1— Pappus of larger spatulate-obovate paleie, in length nearly equalling the breadth of the 

 summit of the villous-pubescent akene, partly traversed by a callous-thickened axis or obscure 

 costa. 



H. artemisissfolius, 1)C. Pannosel}' or somewhat floccosely white-tomentose, or some- 

 what denudate in age: leaves from sim]ily pinnatifid or lyrately few-lobed, and sometimes 

 (piite entire (lanceolate or oblong), to bipinnately parted into broadly linear or narrowly 

 oblong obtuse divisions and lobes: heads 4 lines high: bracts of tlie involucre obovate- 

 oblong, about ecpialling tlie disk-flowers, dull white, lower half green. — Prodr. v. 658 ; Torr. 

 & Gray, Fl. ii. 372. — Texas ; first coll. by lierlandicr. 



# * Lobes of the corolla more or less shorter than tlie throat: pappus conspicuous, of spatiilate or 

 narrow pale;e, which have a manifest costa or thicker opaque axis, this evanescent near or below 

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



