102 COMPOSITE. Eupatorium. 



= = Involucre less than 2 lines long; the bracts broader, green externally, 2-3-nerved when 

 dry: inflorescence somewhat paniculate and leafy. 



E. pauperculum, Gray. A foot or two high, nearly glabrous : leaves ovate-lanceolate 

 (mostly inch long), roundish at base, obtusely serrate, on rather short slender petioles : 

 heads 25-flowered, small (2 lines high), few in the numerous small cymes, which are panicu- 

 lately disposed, terminating short leafy branches : bracts of the involucre 10 or 12, oblong- 

 lanceolate, puberulous, little over half the length of the white flowers : corolla-lobes slightly 

 hirsute outside or becoming naked : pappus soft and white. — Proc. Am. Acad. xvii. 205. — > 

 Santa Rita Mountains, S. Arizona, along brooks and on dripping rocks, Pringle. 

 = = =• Heads comparatively large and few in the cymes, 25-35-flowered: involucre 3 or 4 

 lines high, rather broad. 



E. Rothrockii. Glabrous (or peduncles somewhat pubescent) : stems a foot or two high, 

 simple or brachiately branched above : leaves bright green, ovate or deltoid-ovate, usually 

 acuminate, coarsely and sharply serrate, sometimes irregularly or doubly serrate, and the 

 teeth tipped with a callous gland (the larger 2 inches long, with petiole half-inch or less, 

 smaller in depauperate plants nearly sessile) : bracts of the involucre 15 to 17, equal and 

 similar, linear-lanceolate, mostly acute, glabrous, when dry pale and somewhat scarious and 

 conspicuously 2-3-nerved, nearly equalling the white and soft barbellulate-scabrous pappus : 

 corolla-lobes rather strongly bearded externally. — Mountains of S. Arizona: on Mount 

 Graham, Rothrock (740, 741); Chiricahua Mountains, Lemmon. Heads larger and fewer 

 than in the Mexican E. grandidentatum, DC; the involucre not imbricated as in E. 

 Fendleri. 



§ 3. CoNOCLfNiUM, Benth. Receptacle of the flowers conical or hemispherical : 

 otherwise as in the Eximbricata subsection of the preceding : habit of Ageratum 

 § Ccelestina: flowers blue or violet (sometimes white), sweet-scented: bristles of 

 the pappus rather scanty in a single series : leaves opposite : perennial herbs. — 

 Gonoclinium, DC. Prodr. v. 135. 



E. ccelestinum, L. (Mist-flowek.) Somewhat pubescent: stems erect, branched at 

 summit : leaves deltoid-ovate or subcordate, obtuse or acutish, obtusely serrate, rarely with 

 some coarser salient teeth, slender-petioled : cymes rather compact : receptacle obtusely 

 conical. — Spec. ii. 838 (Dill. Elth. t. 114 ; Pluk. Mant. t. 394) ; Michx. Fl. ii. 100. Ccelestina 

 cmruha, Spreng. Syst. iii. 446, not Cass. Conoclinium cailestinum, DC. 1. c. ; Torr. & Gray, Fl. 

 ii. 92. — Moist shady ground, New Jersey to Florida and Texas, and west to Arkansas'and 

 Illinois. Conoclinium dichotomum, Chapm. in Bot. Gazette, iii. 5, appears to be a lax and 

 more branched form, of Florida and Texas, found only on the coast, approaching the var. 

 salinum, Griseb. Cat. Cub. 146. (Cuba.) 



E. betonicum, Hemsl. From tomentose-villous to glabrate : stems lax, loosely branch- 

 ing : branches naked and pedunculiform at summit, bearing some small corymbose or panic- 

 ulate cymes : leaves oblong, mostly obtuse, in the original form with cordate base, crenate, 

 petioled : receptacle low-conical. —Biol. Centr.-Am. Bot. ii. 93. Conoclinium betonicum, DC. 

 Prodr. v. 135 ; Gray, Bot. Mex. Bound. 76. — Southern border of Texas on the Rio Grande, 

 bchott, a glabrate form. (Adjacent Mex.) 



Var. subintegrum. Leaves sometimes truncate, commonly obtuse or cuneate at 

 base, obscurely crenate, denticulate, repand or entire, from villous or cinereous-tomentulose 

 to nearly glabrous. — Conoclinium betonicum, var. integri folium, Gray, PI. Wrirfit i 88 Eupa- 

 torium Hartwegi, Benth. PI. Hartw. 19 ?- Southern border of Texas, Wright, Bigelow, &c. 

 (Mex.) * 



E- Greggii. Minutely puberulent : stems erect, a foot or two high, bearing one or few 

 small and dense cymes at the naked pedunculiform summit: leaves nearlv sessile, palmately 

 3-5-cleft or parted; the divisions laciniate-pinnatifid into narrow lobes: receptacle I low-con- 

 ical. - Conochmum dissectum, Gray, PI. Wright, i. 88; Bot. Mex. Bound. 76. Eupatorium 

 dissectum, Gray, Proc. Am. Acad, xviii. 100 (name only), not Benth. Bot. Sulph 113 

 with which Hemsley has confounded it. - Low ground, S. Texas to Arizona near the Mexican 

 border, Wright, & . (Adjacent Mex., first coll. by Gregg.) 

 E. ltJteum, Raf in Med Rep. NY, is doubtless a false species. E. crassifolium and 



E. violAceum, Raf. Fl. Ludov, are fictitious, as are all the species of that work. 



