348 COMPOSIT^E. Hdenium. 



tlie pappus ovate, abruptly tipped with a longer awn which equals the villous akene and 

 is little shorter than the disk-corolla. — Jour. Acad. Philad. vii. 66 ; Hook. Comp. Eot. 

 Mag. i. 98; Torr. & Gray, Fl. ii. 38.5; Meehan, Native FL ii. t. 10. —River bottoms, &c., 

 Arkansas to Mississippi, Florida, and Texas : becoming a naturalized weed throughout 

 Southern Atlantic States. 



Var. badium, (jray. Disk dull purplish brown (instead of yellow) : lower leaves 

 sometimes pinnately pai'tcd, the radical into short linear or even somewhat oblong entire or 

 few-toothed lobes. — Proc. Am. Acad, xviii. 108. — Texas, E. Hall, Reverchon, Palmer. 



* # Root annunl, or at most biennial: leaves broader, at least some of them decurrent and form- 

 ing wings on the stem and branches: raj's in several species occasionally particolored with 

 brownish-red. 



-)— Palese of the pappus obtuse or at least pointless, destitute of costa. 

 -H- Rays present : disk and receptacle in fruit elongated. 

 H. quadridentatum, Labill. Loosely paniculate: lower leaves incisely pinnatifid ; 

 upper lanceolate, entire : heads with oval disk becoming oblong, half-inch long, surpassing 

 the rays : receptacle cylindraceoiis-oblong : disk-corollas more commonly 4-toothed : pappus 

 of very short roundish-oval pale.'E. — Act. Soc. Nat. Hist. Par. i. 22, t. 4; Lam. 111. t. 688; 

 Lindl. Bot. Reg. t. 598 ; DC. Prodr. v. 666. //. qiiadripartltum, Link, Euum. ii. .338 1 Rud- 

 heckia alata, Jacq. Ic. Rar. t. 593. Tetrodus quadridentatus, Cass. Diet. Iv. 272. — Low 

 ground, Carolina to Texas, near the coast ; adventive in ballast-heaps to Philadelphia. 

 (Mex.) 



++ -H- Rays present: disk globular. 



H. elegans, DC. Strict, slender : leaves narrowly lanceolate and entire, or lowermost 

 broader and sometimes slightly toothed: heads of the smallest (2 or 3 lines high), with 

 brownish or purplisli disk, equalled or surpassed by tlie pure yellow or particolored or some- 

 times largely brownish-j^urple rays : receptacle barely hemisplierical : pappus miniate, the 

 roundish-ovate palete decidedly shorter than tlie breadth of the akene. — Prodr. v. 667. //. 

 inicrocephalnm, var. bicolor, Torr. & Gray, Fl. ii. 385. H. microcephalum, Curtiss, distrib. 

 151.3. — Moist ground, W. Louisiana and Texas; first coll. by Berlandier. (Adj. Mex.) 



H, microcephalum, DC. Freely branching: leaves lanceolate or oblong, the lower den- 

 ticul;ite or repand-toothed : heads with yellow or fuscous disk (3 or 4 lines high) much sur- 

 passing or sometimes equalled by the rays : receptacle conical-ovate : paleai of the pappus 

 ovate, short, but nearly half the length of the akene. — Prodr. v. 667; Gray, Proc. Am. 

 Acad. ix. 202, in part. //. heterophijlluin, DC. 1. c. as to Berland. 2113 from Reynosa, not of 

 char. H. Texanum, Buckley in Proc. Acad. Philad. 1861, 460, to which aristate pap])ns is 

 wrongly assigned. — Moist ground, Texas; first coll. by Berlandier. (Adj. Mex.) 



H. ampllibolum, Gkav. Stouter, freely branching : upper leaves lanceolate to linear and 

 entire ; lower vaiwing to oblong and toothed or laciniate-pinnatifid : heads with fuscous- 

 purplish globose disk (3 or 4 lines in diameter), equalled or surpassed by the yellow rays: 

 receptacle more than hemispherical : palese of the pappus roundisli and very small, as in 

 //. elegans. — Proc. Am. Acad. ix. 202. //. Mexiranum, DC. Prodr. v. 666, by the char., 

 not HBK. — Southern borders of Texas, on the Rio Grande, at Presidio and Eagle Pass, 

 Havard. (Adj. Mex.) 



H. OOClinium, Gray. Freely branching, rather stout : leaves lanceolate, usually more or 

 less dentate or denticulate : heads with yellowish and fuscous ovate-globose disk (5 or 6 or 

 rarely 4 lines high), longer than the yellow rays : receptacle ovoid-conical (acutish or obtuse) : 

 palea; of the pappus comparatively large, ovate, obtuse, often almost the length of the akene, 

 sometimes with traces of a costa or of a mucro. — Proc. Am. Acad. ix. 202. — Southern 

 borders of Texas, along the Rio Grande, at Presidio and (with smaller heads) at Eagle Pass, 

 Havard. (Northern Mex.) 



+^- -M- -H- Raylcss. 



H. Thurberi, Gray. Slender, pubcrulent, freely branched, 2 or 3 feet high : leaves mostly 

 linear-lanceolate, entire, the lowest broader and denticulate or rarely laciniate : heads glo- 

 bose-ovoid, 3 or 4 lines high, fuscous : receptacle relativelj' large, broadly ovate : pappus of 

 ovate obtuse palea;, about one third the length of the corolla and of the akene. — Proc. Am. 

 Acad. xix. 32. — S. Arizona, Coulter (359, distriliuted as of California), Thurber (wrongly 

 referred to TJ. puhendum iu Bot. Mex. Bound.), Prlngle, Lemmon. 



