Hdianthus. COMPOSITE. 275 



difusus. H. scaberrimus, Ell. Sk. ii. 423. H. Missowriensis (Schweinitz) & H. crassifolius, 

 Nutt. Trans. Am. Phil. Soc. 1. c. Harpalium rigidum, Cass. Diet. Sci. Nat. xx. 200 ; DC 

 Prodr. v. 583, founded on the form witli intermediate palese to the pappus. Plains and 

 prairies, Saskatchewan and Michigan to W. Georgia, Texas, and eastern part of Colorado. 

 Sometimes the disk-corollas are at first yellow ! 



++ ++ Disk yellow. (Here the Californian H. gracilentus would be sought.) 



H. lsetiflorus, Pers. Resembles tall forms of the preceding, similarly scabrous or hispid, 

 leafy : leaves commonly thinner, mostly oval-lanceolate, acuminate at both ends, 4 to 1 

 inches long, more or less serrate : heads usually several and rather short-peduncled : disk 

 half-inch high : bracts of the involucre imbricated in only 2 or 3 series, from ovate- to 

 oblong-lanceolate, acuminate or attenuate-acute, hirsutely ciliate or ciliolate, occasionally a 

 little hirsute on the back : rays numerous, the larger inch and a half loDg. — Syn. ii. 476 ; 

 DC. Prodr. v. 586, excl. syn. Ell. ; Torr. & Gray, 1. <;. H. atrorubens, Lam. Diet. iii. 86, not 

 L. — Prairies and barrens, Indiana, Illinois, Wisconsin. • 



Var. tricuspis, Tokk. & Gray, 1. c. Leaves less serrate : chaff of receptacle more 

 commonly 3-toothed. — H. tricuspis, Ell Sk. ii. 422. W. Georgia, ex Elliott. Needs confir- 

 mation. 



H. pumilus, Nutt. Hispid and scabrous throughout : stems simple, a foot or two high, 

 bearing 5 to 7 pairs of leaves and a" few rather short-peduncled heads : leaves mostly ovate- 

 lanceolate, acute, entire or nearly so (1-J to 4 inches long), rigid, abruptly contracted at base 

 into a short margined petiole : involucre less than half-inch high, white-hirsute or scabro- 

 hispidulous ; its bracts imbricated in about 3 series, oblong-lanceolate, acutish : rays about 

 inch long. — Trans. Am. Phil. Soc. vii. 366; Gray in Am. Jour. Sci. ser. 2, xxxiii. 239. — 

 Eastern Eocky Mountains and adjacent plains of the Platte, &e., from Wyoming to Colorado, 

 Nuttall, Hayden, Geyer, Parry, Hall & Harbour, &c. 



H. OOCidentalis, Riddeix. Stem slender, 2 or 3 feet high, sometimes smooth and gla- 

 brous, usually leafy only at and near the base : radical and lowest cauline leaves ovate to 

 lanceolate-oblong, entire or denticulate, contracted at base into long margined petioles, 

 minutely hirsute or hispidulous, moderately scabrous ; upper cauline a few remote pairs, sub- 

 sessile, lanceolate, and bract-like, of an inch or half-inch in length : heads few or sometimes 

 solitary, small : bracts of the involucre ovate to lanceolate, acute or acuminate, glabrous, or 

 the margins sometimes ciliate, sometimes naked : rays half-inch to nearly inch long : akenes 

 when young and at summit pubescent. — Suppl. Cat. Ohio Pi. (1836), 13 ; Torr. & Gray, Fl. 

 ii. 323. IT. heterophyllus, Short, Cat. Kentucky PL Suppl. 3 ; Hook. Comp. Bot. Mag. i. 98, 

 partly, not Nutt. — Prairies and oak barrens, in dry ground, Michigan to Kentucky and 

 Missouri. 



Var. plantagineus, Tore. & Gray, 1. c. Minutely pnbemlent and slightly or not 

 at all scabrous : leaves rather more rigid : involucre obscurely ciliolate or naked. — Texas, 

 Drummond, Lindheimer, Wright. (Adj. Mex.) 



Var. DowelliantlS, Torr. & Gray. Like the preceding, but leafy to the middle or 

 higher, the leaves larger and mostly ovate, and stem sometimes branching. — Fl. ii. 504. 

 H. Dowellianus, Curtis in Am. Jour. Sci. xliv. 82. — Mountain region in the southwestern 

 part of North Carolina, Curtis, Buckley, &c. 



# # # Involucre looser and the bracts disposed to be more taper-pointed, or elongated, or foli- 

 aceous (closer and shorter in some species) : disk except for the dark anthers yellow or 

 yellowish. 



+- Canescent or cinereous, at least the foliage, with soft and fine appressed (but not tomentose) 

 .pubescence: leaves all opposite, sessile, merely serrulate: heads middle-sized: bracts of the in- 

 volucre imbricated; their attenuate tips seldom or little, surpassing the disk: Atlantic species. 



H. cinereus, Torr. & Gray. A foot or two high, barely cinereous throughout with 

 minute and slightly scabrous appressed pubescence : stem simple, somewhat equably, leafy, 

 bearing one or two slender-pedunculate small heads : leaves coriaceous, lanceolate-oblong, 

 acute; lower (3 inches long) contracted into a rather long narrowed base ; uppermost (about 

 inch long) ovate-lanceolate with a broad sessile base : involucre half -inch high ; its bracts 

 lanceolate-subulate, canescent: rays 10 or 12, two-thirds inch long. — Fl. ii. 324, excl. var. 

 — Texas, Drummond. Heads little larger than those of H. occidentalis, of which it may be a 

 ' hybridized offspring. 



