218 COMPOSITiE. Erirjeron. 



radical not larger, obovate or spatulate, slender-petigled : heads solitary, terminating the 

 branches, on rather slender peduncles : involucre broad, 3 lines high, slightly pubescent : 

 rays aliout 50, apparently white, 4 lines long, not very narrow: pappus indistinctly double, 

 the outer short and setulose. — Mogollon Mountains, X. Arizona, Rusbt/. 



B. ArizonicUS, Gkay. Cinereous-hirsute throughout: stem 2 feet high from an annual 

 root, strict, with simple branches, leafy : leaves oblong-lanceolate and sessile, or lower ob- 

 ovate-ohlong and petiolcd, an inch or two long : heads solitary and short-peduncled, termi- 

 nating the branches, half-inch high and broad ; involucre hirsute : rays 80 to 100, white, 

 4 or 5 lines long : outer pappus very conspicuous, setose-squamellate. — Near Tanner's Cafiou 

 in the Huachuca Mountains, >S. Arizona, Lcmmon. 



= = Uays of the small heads rather numerous but small, shorter than or barely equalling the 

 flowers of the convex disk. Verges to § Ctenotns. 



B. incomptus. A foot or two high, branched from the base, slender and erect, hirsute 

 with short spreading pubescence, leafy : leaves narrowly linear (half-inch or inch long, a line 

 or less wide}, or lower narrowly spatulate-lanceolate and attenuate into slender petiole : heads 

 slender-pedniicled : involucre 2 lines high, shorter than the hemispherical disk : rays either 

 verv numerous or fewer, slender, with ligule only a line long, bluish or purplish : outer pappus 

 conspicuous, subulate-squamellate, longer than the breadth of the glabrate akene ; inner 

 scanty and rather deciduous. — Carysito, Lower California, near the U. S. border, within 

 which it probably occurs, C. R. Orcutt. 



= = ^ Rays of the small heads only 30 or 40, well exserted, white, not very narrow, barelj' 

 3 lines long, and with pappus as in the disk -flowers ; leaves narrow, entire. 

 B. modsstus, Gkay. A foot or less high and much branched from an indurated but an- 

 nual root, slender, rigid, cinereous-hirsute or hispid : branches terminated by the smaU (2 

 lines high) slender-pedunculate heads: upper leaves linear aud lower narrowly spatulate, 

 about an inch long. — VI. Tendl. 68 (excl. syii.) & PL Lindh. ii. 220. — Dry and sterile rocky 

 plains, W. and X. W. Texas, Liinlheimer, Wright, &c. 



== = = = Kays of small or barely middle-sized heads very numerous (about 100), narrow, 

 with pappus like the disk-flowers; the inner of rather scanty bristles; ouler of short subulate 

 squamella' : leaves from entire to sparingly lobed. 



' B. divergens, Torr. & Gray. Diffusely branched and spreading, a foot or less high, 

 cinereous-pubescent or hirsute : leaves linear-spatulate or the upper linear and the lowest 

 broader (these 2 to 4 lines wide, sometimes laciniately toothed or lobed) : heads 2 or 3 lines 

 high, and the white or purplish or sometimes violet rays equally long : involucre hirsute : 

 receptacle in age commonly very convex. — FI. ii. 175; Gray, PI. Fendl., PI. AVright., 

 &c. E.stricjosus, var.. Hook. Fl. ii. 18, iu part. E. (Ollijulrichiiim) diraricatiis, Kutt. Trans! 

 Am. Phil. Soc. 1. c. 311. — Low plains and river-banks, Nebraska to ^X. Texas, AVashingtou - 

 Terr., and California. (Adj. Mex.) 



Va.r. cinereus. Gray, 1. c. Dwarf and flowering almost from the root, with the 



earliest heads on slender almost scapiform peduncles; or leafy and later heads shorter- 

 pednncled: pubescence soft aud cinereous. — i?. chiin-cnx, Grav, PI. Fendl. 68. E. nudijiorus, 

 Buckley in Proc. Acad. Philad. 1861, 456. — W. Arkansas to Arizona. (Adj. Mex.) 

 E. tenuis, Torr. & Gray. Branched from the annual or biennial root, ascending or erect, 

 a span or two high, somewhat hirsute or pubescent : leaves oblong-spatulate or lanceolate,' 

 and the lowest obovate (4 to 6 lines iN-ide), occasi,>nalIy few-tootlied or sinuate-lobed : heads 

 little over 2 lines high: involucre nearly glabrous : rays white and purplish.— Fl. ii. 175. 

 E. qni'rr.lfo^inm, Xutt. ; DC. Prodr. V. 285, not Lam. ' E. Brazoensis, Buckler, 1. c. — Low 

 grounds, Arkansas, Louisiaua, and Texas. 



= = = = = Kays of *1« small heads not oxcessivelv numerous, nor vorv narrow (2 or 3 

 Imc- long), white or barely purplish-tinged; the bristles of their pappus commonlv wautin.^ or 

 very few: outer papjius a short <ro,vn ..f distinct or parllv united slender squamella., pcr.is'tont 

 after the fragile inner pappus lias fallen; fall and erect winter annuals <n- biennials leafv 

 branelr.-a above, I.eanng corymho..ely cyni,„e or paniculate heads, commonly produced all suml 

 mor: leaves green soraetuncs serrate or the lower incised: weedv species, of wide distribution; 

 fts two generally di-tmct m the Atlantic States, hardly so on the Pacific side. - Phahcroloma, 

 Cass. Diet, xxxix. 404. 



-B. animus, Pers. Sparsely hirsute with spreading hairs, 2 to 5 feet high : leaves membra- 

 naceous, from ovate to broadly lanceolate, mostly serrate, lower ofteii very coarsely so: 



