308 COMPOSITE. Hymenatherum. 



pappus of 1 8 or 20 very narrow palete, of 2 or 3 lengths, the smaller attenuate into a short 

 single awn, tlie larger into a mucli longer capillary awn, with a delicate sliort one at each 

 side of its base, or rarely an additional pair of seta3. — PI. Wright, i. IIG. — 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 on peduncles 1 to 3 

 inches long : leaves not rigid, uari-owly 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 : palere of the pappus 10, all slenderly 3-awned from a short lanceolate 

 base; lateral awns witli subulate base, half the length of middle one. — PI. Fendl. 89, PI. 

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



H. tenuilobum, 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) peduucles : leaves rather rigid, all pinnately parted into 7 to 11 sulnilate-filiform 

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

 12-toothed : paleai 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 (wliidi, however, sometimes splits away from the awn on each side), rarely one or two 

 smaller lateral set£B or cusj^s. — Prodr. v. 642. H. tenuifolium, Gray, PI. Wright. 1. c, not 

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



•1— -!— All 10 palesB of the pappus nearly similar and tapering into a single short awn, and the 

 larger mostly 2-setulose : leaves acerose. 



H. Tlllirberi, Gr.\y. Habit and character of a moi'e leaf\--stemmed form of H. pentachcEtum : 

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

 ones subulate-awn-pointed, 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. H. tenui- 

 folium,\a,v.'i Gray, PI. Wright, ii. 93. — Texas or adjacent New Mexico, on the Mexican 

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

 Parrg.) 



-I— -)— H— Pappus manifestl}- double and dimorphous, of 10 scarious paleie; the 5 outer shorter, 

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

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



++ Low and diffuse suffruticulose perennials, minutely cinereous-pubescent or glabrate, not woolly, 

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

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

 gated filiform peduncles. 



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

 opjiosite, 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. //. Berlundieri, Benth. PI. Ilartw. 

 18, not DC. — W. Texas to S- Arizona, Wright, Lemmon. (Mex.) 



H. pentach^tum, DC. Decidedly suffruticulose, low, diffuse, cinercous-puberulent, 

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

 spreading pubescence : leaves rigid, upper alternate, divisions slender subulate-acero.se : in- 

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

 pappus thinnish, usually erose at summit. — Gray, PI. Wright, i. 117. //. pentachatum 

 (the outer pappus overlooked) & //. 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, Tr€cid, in herb. Mus. Paris. 



-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 



