348 COMPOSIT.E. Eelenium. 



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. Corap. Bot. 

 Mag. i. 98; Torr. & Gray, Fl. ii. 385; Meehan, Native Fl. iL t. 10. — Eiver bottoms, &c., 

 Arkansas to Mis.si.ssippi, Florida, and Texas: becoming a naturalized weed throughout 

 Southern Atlantic States. 



-Var. badium, Gn.iV. 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, Reverckon, Palmer. 



# * Root annual, or at most biennial: leaves bi-oader, at least some of them decm-rent and form- 

 ing wings on the stem and branches: rays in several species occasionally particolored with 

 brownish-red. 



-1— Paleo2 of the pappus obtuse or at least pointless, destitute of costa. 

 -H- Bays 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-obloug : disk-corollas more commonly 4-toothed : pappus 

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

 Lindl. Eot. Reg. t. 598 ; DC. Prodr. v. 666. H. quaclripartitum. Link, Enum. ii. 338 ? Rud- 

 beclcia alata, Jacq. Ic. Ear. t. 593. Tctrodus quadridentatvs, Cass. Diet. Iv. 272. — 'Low 

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

 (Mex.) 



++ ++ 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 

 brownisli 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 paleo3 decidedly shorter than the breadth of the akene. — 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 Berlandier. (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 : pale;E of the pappus 

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

 Acad. ix. 202, in part. //. heterophyllum, DC. 1. c. as to Borland. 2113 from Eevnosa, not of 

 char. H, Tcxannm, Buckley in Proc. Acad. Philad. 1861, 460, to which ari.*tate pappus is 

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



H. amphibolum, Ghat. Stouter, freely bramhing: upper leaves lanceolate to linear and 

 entire ; lower varying to oblong and toothed or laciniate-piunatifid : 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 roundish and very small, as in 

 H. elegans. — Proc. Am. Acad. ix. 202. H. Mr.rlcaniim, DC. Prodr. v. 666, by the char., 

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

 HaiKird. (Adj. Mex.) 



H. OOOlinium., Gijay. Freely branching, rather stout : leaves lanceolate, usually more or 

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

 rarely 4 lines high), longer than the yellow rays : receptacle ovoid-conic;\l (acutish or obtuse) : 

 palc;i; of the pappus comparatively large, ovate, obtuse, often almost the length of tlie akene, 

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

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

 Ilavard. (Northern Mex.) 



-w- +-(. -H- Kaylcss. 



H. Thurberi, Gr.w. Slender, puberulent, freely branched, 2 or 3 feet high: lea^cs mostly 

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

 bose-ovoid, 3 or 4 lines high, fuscous: receptacle relatively large, broadly o^ate: j.appus of 

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

 Acad. xix. 32. — S. Arizona, Cm^lter (359, distributed :is of California), Thurhcr (wrongly 

 referred to //. puherulum in Bot. Mex. Bound.), Pn'mjle, Lemmon. 



