Hymknopappus. composite. 373 



Prairies of Arkansas, Dr. Leavenworth! Texas, Drummond ! (3. Red 

 River, Arkansas, NutlalL ! — (5) Stem 2-3 feet high, loosely corymbose 

 above ; tlie branchlets minutely tomentose and somewhat glandular. Lower 

 leaves somewhat petioled. Heads one-fourth to one-third of an inch in 

 diameter. Scales of the involucre unequal, the larger somewhat dilated. — 

 The pappus in var. /J. is somewhat more conspicuous, and tlie lobes of the 

 leaves more slender. So far as relates to the s|)ecimen of Nuttall, this is the 

 H. tenuilblius of De Candolle, who, unaccjuainted with Pursh's plant, has 

 modified the character of that author, so that it no longer accords with either 

 species. 



* * Scales of the oppressed involucre with v;hitish or scarious margins: tube of the co- 

 rolla, not longer than the b-ioothed or cleft limb. 



4. H. tenmfoUus (Pursh) : lanuginous-canescent ; stem stout, corj^mbose 

 at the summit; leaves bipinnateiy divided; tlie divisions very narrowly 

 linear, entire, rigid, somewhat glabrous; heads in a loose compound corymb; 

 scales of the involucre (6-8) oval, appressed, much shorter than the fully de- 

 veloped disk; achenia very villous; scales of the pappus spatulate-oblong, 

 as long as the tube of the corolla. — Pursh! fi. 2. p. 742; Niitt. ! gen. 2. 

 p. 139 ; DC. prodr. b. p. 658. (excl. syn. Nutt. j)l- Arkans., and a part of the 

 character founded on it.) 



Upj)er Missouri, Bradbury! Nuttall! (v. sp. in herb. Lamb.) Mr. Nicol- 

 let! on gravelly hills, &:c. May-June. — @ Stetn 12-15 inches high. 

 Leaves sessile, rigid, the pinnae of the lower in 8-12 pairs; the d. visions 2-4 

 pairs, irregular and unequal; occasionally somewhat 3-pinnatifi 1. Heads 

 pedunculate, fastigiate, a third of an inch in diameter; the invilucre not 

 spreading and petaloid as in all the preceding. Flowers greenish-white. 

 Throat of the corolla short, abruptly inflated, about the length of the tube, 

 deeply 5-toothed. Achenia more villous, and the pappus more conspicuous 

 than in any other species ; the scales of the latter somewhat denticulate at 

 the apex. 



5. H.fiUfolius (Hook.): tomentose-canescent, the pubescence somewhat 

 deciduous; stem looselv paniculate-branched ; leaves 1-2-pinnately divided; 

 the divisions scattered, rigid, filiform-linear, canaliculate ; peduncles mostly 

 solitary ; scales of the involucre ('about 12) oval, ap{)ressed, shorter than the 

 disk; achenia villous; scales of the inconspicuous pappus somewhat lacer- 

 ate. — Hook.! fl. Bor.-Am. 1. j^- 317 ; NtUt. ! in trans. Amer. pliil. soc. I. c. 

 p. 374. 



Arid plains of the upper Oregon, Douglas! Nuttcdl! — HI Stem 10-20 

 inches high. Lower leaves petioled : the divisions few, often simple and an 

 inch or more in length. Heads fully as large as in the preceding. Achenia 

 less angled or tapering at the base, not dilated at the apex ; the hyaline 

 scales of the pappus nearly concealed among the villous hairs of the ache- 

 nium, and shorter than the tube of the (white) corolla. — In Mr. Nuttall's 

 specimens, the pappus is more conspicuous than in those collected by 

 Douglas. 



6. H. luteus (Nutt.) : dw^arf, woolly-canescent ; stems several from a 

 thick caudex; leaves petioled, chiefly radical, pinnately-divided ; the divi- 

 sions very much crowded, small, pinnatifid or trifid ; the lobes very short, 

 linear, obtuse; heads (small) somewhat paniculate; scales of the involucre 

 (about 12) oblong-obovate, appressed, rather shorter than the disk; achenia 

 very villous; scales of the pappus lacerate or denticulate, shorter than the 

 tube of the (yellow) corolla. — Natt. ! in trans. Amer. phil. soc. I. c. 



Rocky Mountains near the sources of the Colorado of the West, particular- 



