218 COMPOSITE. Erigeron. 



radical noc larger, obovate or spatulate, slender-petioled : heads solitary, terminating the 

 brandies, on ratlier slender peduncles : involucre broad, 3 lines high, slightly pubescent : 

 rays al)ont 50, apparently white, 4 lines long, not very narrow : pappus indistinctly double, 

 the outer short and setulose. — MogoUon Mountains, N. Arizona, Rush//. 

 g^ ArizonicuS Gray. 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-olilong and petiokd, an inch or two long: heads solitary and short-peduncled, termi- 

 natin"- 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 Caiiou 

 in the Iluachuca Mountains, S. Arizona, Lemmon. 



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

 flowers of the convex disk. Verges to § Cceiiotiis. 

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

 with sliort 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-peduncled : involucre 2 lines liigh, shorter than the hemisplierical disk : rays either 

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

 conspicuous, subulate-s(iuamellate, 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. 

 E. modsstus, Gray. 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 small (2 

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

 about an inch long. — PI. Fendl. 68 (excl. syn.) & PI. Lindh. ii. 220. — Dry and sterile rocky 

 plains, W. and N. W. Texas, Lindheimer, Wright, &c. 



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



with pappus like the disk-flowers; the inner of rather scantj' bristles; outer of short subulate 



S(juauiella; : leaves from entire to sparingly lobed. 



E. 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. — Fl. ii. 175; Gray, PI. Fendl., PL Wright., 



&c. E. strigosus, var.. Hook. PI. ii. 18, in part. E. (Oligotrichlnin) diraricatus, Nutt. Trans. 



Am. Phil. Soc. 1. c. 311. — Low plains and river-banks, Nebraska to W. 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- 

 peduucled : pubescence soft and cinereous. — E. cinereus, Gray, 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 animal 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 wide), occasionally few-toothed or sinuate-lobed : heads 

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

 E. qnerci folium, Nutt. ; DC. J'rodr. v. 285, not Lam. E. Brazoensis, Buckley, 1. c. — Low 

 grounds, Arkansas, Louisiana, and Texas. 



^ = = = = Rays of the small heads not excessively numerous, nor very narrow (2 or 3 

 lines long), white or barely purplish-tinged; the bristles of their pappus connnonly wanting or 

 very few: outer pappus a sliort crown of distinct or partly united slender squanielhe, persistent 

 after the fragile inner pappus has fallen: tall and erect winter annuals or biennials, leafy, 

 branched above, bearing corymbosely c^'mose or paniculate heads, commonly produced all sum- 

 mer: leaves green, sometimes serrate or the lower incised: weedy species, of wide distribution; 

 the two generally distinct in the Atlantic States, hardl}' so on the Pacilic side. — Phalacroloma, 

 Cass. Diet, xxxix. 404. 

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

 naceour., from ovate to broadly lanceolate, mostly serrate, lower oft^u very coarsely so : 



