358 COMPOSITE. Hymenatherum. 



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

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

 side of its hase, or rarely an additional pair of sette. — PI. Wright, i. 116. — Prairies, S. W. 

 Texas and New Mexico, Wrirjhl. (Chihuahua, adj. Mex., Thurher.) 

 H. ^Trightii, 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, narrowly linear or almost filiform (an inch or more long), setu- 

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

 high, I6-20-toothed : paleai of the pappus 10, all slenderly 3-awned from a short lanceolate 

 base ; lateral awns with subulate base, half the length of middle one. — I'l. Fendl. 89, PI. 

 Lindh. ii. 229, & PI. Wright. 1. c. — Prairies of Texas, Wright, Lindlieimer, &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) peduncles : leaves rather rigid, all pinnately 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 : paleee 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 (wdiich, however, sometimes splits a^vay from tlie awn on each side), rarely one or two 

 smaller lateral setse or cusps. — Prodr. v. 642. 11. tenuifolium. Gray, PI. Wriijlit. ]. c, not 

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



-i— -I— All 10 paleffi of the pappus nearly similar and tapering into a single short awn, and the 

 lai'ger mostly 2-setulose: lea^'es acerose. 



H. Thlirberi, Gkay. Habit and character of a more leafy-stemmed form of H. pentachcetum : 

 paleai 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 palea?, and a pair of 

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

 /b//inn, var. ? Gray, PI. Wright, ii. 93. — Texas or adjacent Xew Mexico, on the Mexican 

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

 Parrij.) 



•^ -i~ •\~- Pappus manifestly double and dimorphous, of lO'scarious palese; the 5 outer shorter, 

 spatulate or oblong, obtuse and pointless; inner lanceolate or oblong, beai-iiig a single awn, of 

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



++ Low and diffuse sutEruticulose perennials, minutely cinereous-pubescent or glabrate, not woollv, 

 much branclied from the base: leaves rigid or rigidulous, pinnately parted into few or several 

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

 gated filifoim peduncles. 



H. Hartwegi, Geat. a span or two high, nearly herbaceous and glabrous : leaves chiefly 

 opjjnsite, of few rather long filiform-acerose divisions: lie;uls numerous: invulucre rather 

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

 cate snnmiit oliscurely denticulate. — PI. Wright, i. 117. //. Bcrhiiidieri, Beuth. PI. Ilartw. 

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

 • H. pentaoh^tum, DC. Decidedly suffruticulose, low, diffuse, cinereous-puberulent, 

 sometimes glabrate and rather shining, sometimes the foliage canescent witli sliort and fine 

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

 volucre from broadly campanulate to hemispherical, 2 or 3 lines liigh : outer pale* of the 

 pappus thinnish, usually erose at summit. — Gray, PI. Wriglit. i. 117. II. pcntachalnm 

 (the outer pappus overlooked) & H. Brrhmtlieri. DC. Prodr. v. 042. — Dry hills, Texas (first 

 coll. by Derliindier) to Arizona and S. Ut;i]i : very variable. (Mex.) 



H. Treciilii, < iiiAV. Diffuse, nc:irly herb;ueons, almost glabrous, with lo(ise elongated Iciify 

 branches and very scattered he:uls : leaves perhaps ratlier succulent, pectinatelv parted into 

 linear-subulate e(|ual short (2 or 3 lines long) divisions, wliich are r:,ther narrower thiin the 

 rhachis: involucre (3 lines high) and pa]ipus of the preceding. — Proc. Am. Acad. xix. 42. 

 — S. E. Tex;is, Tr^riil, iii herb. Mus. Paris. 



++ ++ Low and densely floceose-lanalc and soft-leaved annual. — Gnnjiludlopsis, DC. 

 H. Gnaphaliopais, Ghat. Depressed or diffusely sprc:i(Iinn-, clothed even to the involucre 

 with dense white wool in the majiner of a Cudweeil, leafv up to the sessile or short-pednncled 

 solitary heads: leaves mostly alternate, si)atulate, entire, barely half-inch long; involucre 



