348 COMPOSITE. Hclenium. 



the 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. Hot. 

 Mag. i. 98; Torr. & Gray, Fl. ii. 385; Meelian, Native Fl. ii. t. 10. River bottoms, &c., 

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

 Southern Atlantic States. 



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

 sometimes pinnately parted, 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: rays in several species occasionally particolored with 

 brownish-red. 



H Pale:e 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 cylindraceous-oblong : disk-corollas more commonly 4-toothed : pappus 

 of very short roundish-oval palerc. Act. Soc. Nat. Hist. Par. i. 22, t. 4; Lam. 111. t. 688; 

 Liudl. Bot. Reg. t. 598 ; DC. Prodr. v. 666. H. quadnpartitum. Link, Enum. ii. 338 ? Rurl- 

 beckia alata, Jacq. Ic. liar. t. 593. Tctrodns quadridentatus, Cass. Diet. Iv. 272. Low 

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

 (Mex.) 



-H- -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 purplish disk, equalled or surpassed by the pure yellow or particolored or some- 

 times largely brownish-purple rays : receptacle barely hemispherical : pappus minute, the 

 roundish-ovate paleae decidedly shorter than the breadth of the akeue. Prodr. v. 667. //. 

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

 1513. Moist ground, W. Louisiana and Texas; first coll. by Bcrlandier. (Adj. Mex.) 



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

 ticulate 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 : palerc of the pappus 

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

 Acad. ix. 202, in part. //. heterophyttum, DC. 1. c. as to Beiiand. 2113 from Revnosa, not of 

 char. //. Tt.rdiniin, Buckley in Proc. Acad. Philad. 1861, 460, to which aristate pappus is 

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



H. amphibolum, GRAY. Stouter, freely branching : upper leaves lanceolate to linear and 

 entire; lower varying to oblong and toothed or laeiniate-pinnatifid : heads with fuscous- 

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

 receptacle more than hemispherical: palere of the pappus roundish and very small, as in 

 H. elegans. Proc. Am. Acad. ix. 202. II. Me.ricaninn, 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. oodinium, 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) : 

 palens 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, 

 Ilavard. (Northern Mex.) 



H- -H- -H- Rayless. 



H. Thurberi, GRAY. Slender, puberulent, freely branched, 2 or 3 feet high: leaves mostly 

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

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

 ovate obtuse palese, about one third the length of the corolla and of the akene. Proc. Am. 

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

 referred to 77. pubendum in Bot. Mex. Bound.), Pringle, Lemmon. 



