358 COMPOSITE. Hymenatherum. 



pappus of 18 or 20 very narrow paleae, of 2 or 3 lengths, the smaller attenuate into a short 

 single awn, the larger into a much longer capillary awn, with a delicate short one at each 

 side of its base, or rarely an additional pair of setaa. PI. Wright, i. 116. Prairies, S. W. 

 Texas and New Mexico, Wright. (Chihuahua, adj. Mex., Thurbcr.) 



H. "W^rightii, GRAY. Erect or diffuse, a foot or less high from a firm annual or perhaps 

 perennial root : branches rather simple, bearing few or solitary heads ou peduncles 1 to 3 

 inches long : leaves not rigid, narrowly linear or almost filiform (an inch or more long), setu- 

 lose-mucrouate, many entire, some with 1 to 3 small subulate lobes : involucre fully 3 lines 

 high, 16-20-toothed : palese of the pappus 10, all slenderly 3-awned from a short lanceolate 

 base; lateral awns with subulate base, half the length of middle one. PL Fciidl. 89, PI. 

 Liudh. ii. 229, & PI. Wright. 1. c. Prairies of Texas, Wright, Lindheimer, &c. 



H. teniTllobuni, DC. Diffusely branched and spreading from a seemingly annual but 

 sometimes more enduring root: branches a span to a foot long: heads on filiform (1 to 4 

 inches long) peduncles : leaves rather rigid, all pinuately parted into 7 to 11 subulate-filiform 

 setulose-mucrouate divisions (of only 2 to 4 lines in length) : involucre 3 lines high, about 

 12-toothed : palese of the pappus 10, more rigid, all nearly similar and bearing two lateral 

 and a middle longer stouter awn, the latter hardly longer than the lanceolate paleaceous por- 

 tion (which, however, sometimes splits away from the awn on each side), rarely one or two 

 smaller lateral setae or cusps. Prodr. v. 642. //. tenuifolium, Gray, PI. Wright. 1. c., not 

 Cass. S. Texas along and near the Rio Grande, Berlandier, Wright, &c. (Adj. Mex.) 



-I -) All 10 palese of the pappus nearly similar and tapering into a single short awn, and the 

 larger mostly 2-setulose: leaves acerose. 



H. Thurberi, GRAY. Habit and character of a more leafy-stemmed form of H. pentachcetum : 

 palese of the pappus not distinctly in two series, all narrowly lanceolate, alternate shorter 

 ones subulate-awn-poiuted, the others with awn rather shorter than the paleae, and a pair of 

 obscure or more manifest setulose teeth at its base. Proc. Am. Acad. xix. 41. //. tenui- 

 foliuin, var. ? Gray, PI. Wright, ii. 93. Texas or adjacent New Mexico, on the Mexican 

 border near El Paso, Wright. Corralitas, Thurber. (Apparently also Northern Mexico, 

 Parry.) 



-t -1 * Pappus manifestly double and dimorphous, of 10 scarious palea?; the 5 outer shorter, 

 spatulate or oblong, obtuse and pointless ; inner lanceolate or oblong, bearing a single awn, of 

 equal or greater length, between a pair of cusps or subulate or sometimes aristellate teeth. 



H- Low and diffuse suffruticulose perennials, minutelv cinereous-pubescent or glabrate, not woolly, 

 much branched from the base: leaves rigid or rigidulous, pinnsitely parted into few or several 

 mostly filiform or acerose entire divisions, subulate or setulose-mucronate at tip: heads on elon- 

 gated lilifoim peduncles. 



H. Hartwegi, GRAY. A span or two high, nearly herbaceous and glabrous : leaves chiefly 

 opposite, of few rather long filiform-acerose divisions: heads numerous: involucre rather 

 narrow, 2 lines high, almost naked at base : outer palese of pappus subcoriaceous, with trun- 

 cate summit obscurely denticulate. PI. Wright, i. 117. //. Berlandieri, Benth. PL Hartw. 

 18, not DC. W. Texas to S, Arizona, Wru/ht, Lemmon. (Mex.) 



H. pentach&tum, DC. Decidedly suffruticulose, low, diffuse, cinereous-puberulcnt, 

 sometimes glabrate and rather shining, sometimes the foliage cauescent with short and fine 

 spreading pubescence : leaves rigid, upper alternate, divisions slender subulate-acerose : in- 

 volucre from broadly campanulate to hemispherical, 2 or 3 lines high : outer paleas of the 

 pappus thiunish, usually erose at summit. Gray, PL Wright, i. 117. //. pcntacluftum 

 (the outer pappus overlooked) & H. Berlandieri, DC. Prodr. v. 642. Dry hills, Texas (first 

 coll. by Berlandier) to Arizona and S. Utah : very variable. (Mex.) 



H. Treculii, GRAY. Diffuse, nearly herbaceous, almost glabrous, with loose elongated leafy 

 branches and very scattered heads : leaves perhaps rather succulent, pectinately parted into 

 linear-subulate equal short (2 or 3 lines long) divisions, which are rather narrower than the 

 rhachis : involucre (3 lines high) and pappus of the preceding. Proc. Am. Acad. xix. 42. 

 S. E. Texas, Trtfcul, in herb. Mus. Paris. 



-H- -H- Low and densely floccose-lanate and soft-leaved annual. Gnnphaliopsis, DC. 



H. Gnaphaliopsis, GRAY. Depressed or diffusely spreading, clothed even to the involucre 

 with dense white wool in the manner of a Cudweed, leafy up to the sessile or short-peduncled 

 solitary heads : leaves mostly alternate, spatulate, entire, barely half-inch long : involucre 



