100 COMPOSIT.E. Eupatoriwrn. 



base; some of them alternate. — E. truncatum, Muhl. in WilM. Spec. iii. 1751. E. salvim- 

 fo/iiiin, Sims, Bot. Mag. t. 2110. — With the normal form. 



Var. CUneatum, Engelm. (E. cunnitum, Engelm. in Torr. & Gray, 1. c), with 



smaller leaves narrowed as well as disjoined at base, and fewer-flowered heads, has the 

 appearance of being a hybrid between E. semisernitum and E. perfoliutum. — Eastern Ar- 

 kansas and Missouri, Engelmann. Also Louisiana, Hale, a form between this state and the 

 preceding. 



- E. resinosum, Toee. Puberulent, glutinous with resinous atoms : stem .slender, 2 or 3 

 feet high, fastigiate-corymbose at summit: leaves linear-lanceolate (4 to 6 inches long, 4 to 6 

 lines wide), half -clasping or slightly connate, finely serrate, giabrate aljove, canescent beneath ; . 

 cymules numerous in compound cymes : bracts of the 10-15-flowered involucre narrowly 

 oblong, obtuse. — DC. Prodr. v. 176;' Torr. & Gray, Fl. ii. 88. — Wet pine barrens, New 

 Jersey, where it was first collected by Bartram. 



-I— -1— H— •)— Heads 24-30-flowered, hardly over 2 lines long : bracts of the involucre of three 

 lengths, obtuse, thin, conspicuously few-nerved; habit of the following section. 



E. pycnooephalum, Li ss. Pubescent or nearly glabrous : stems slender, erect or spread- 

 ing from a perennial root, a foot or two high : leaves membranaceous, deltoid-ovate or sub- 

 cordate, acute or acuminate, coarsely serrate or dentate, slender-petioled : cymes small and 

 compact, solitary or corymbosely clustered at the end of naked branches : heads very short- 

 pedicelled ; involucre campanulate ; the bracts mostly glabrous, oblong and oblong-linear, 

 very obtuse ; innermost equalling tlie white flowers. — Less, in Linn. vi. 404. E. >>chiede- 

 aniim, Schrad. Ind. Sem. Hort. Goett. 1832, 3; DC. Prodr. v. 159. E. mnilinr-rve, Beuth. 

 PI. Hartw. 76. E. Sonorce, Gray, PI. Wright, ii. 76. — Rocky ravines, S. Arizona and along 

 the Mexican borders of Texas ; a form with small and deeply dentate leaves, and compara- 

 tively few and small heads. E. Schledeanum, var. grosse-dentatam. Gray, Bot. Mex. Bound. 

 76. (Mex., &c.) 



# * * Involucre (campanulate or oblong) of bracts all of the same length or nearlv so, in one or 

 two series, or with only a few accessory and shorter ones at base : leaves mainly opposite, 

 petioled. — § /^xlnibrirata, DC. 



-I— Shrubby, freely branched: flowers white, sometimes purplish-tinged. 



E. "Wrightii, Geat. A foot or two high, puberulent: branches very leafy : leaves small 

 (half-inch long), ovate, obtuse, entire or obscurely few-toothed, thickish, scabrous, abruptly 

 contracted into a short margined petiole : heads (3 or 4 lines long), about 12-fluwered, rather 

 few in a somewhat leafy terminal cyme : involucre half the lengtli of the flowers, of about 

 10 oblong-lanceolate acute or obtusish greenish obscurely 3-uerved and equal bracts in a 



double series, sometimes one or two small accessory ones. — PL Wright, i. 87, ii. 73. 



Guadalupe Mountains, western borders of Texas, ]Vri(jht. 



E. villosum, SwARTZ. Shrub 4 to 6 feet high, rusty-pubescent : leaves ovate or somewhat 

 deltoid, rather obtuse, sparingly serrate or s(jme entire, tomentulose beneath (1 to 3 inches 

 long), on short slender petioles : heads small (2 or 3 lines long), 8-15-flowered, numerous and 

 crowded in corymbiform cymes : involucre lialf the length of the fully developed flowers, of 

 8 to 10 oblong-lanceolate obtuse and nerveless equal bracts. — DC. Prodr. v. 172 ; Cb.apm. 

 PL 196. E. rubellar., DC. L c. ■!— S. Florida, Blodyett, Garber, Curtiss, &ii. (W. Ind.) 



B. a.geratifolium, DC. Shrub 3 to 7 feet high, with slender and spreading mostly herba-. 

 ceous branches, green and nearly glabrous : leaves deltoid-ovate, obtusish or obtusely acumi- 

 nate, coarsely and rather obtusely dentate (2 or 3 inches long), slender-petioled: heads 

 (5 lines long), pedicelled, numerous in corymbiform cymes, 10-30-floi\erc(l : in^olucral bracts 

 8 to 12, narrowly lanceolate or linear, iicutish, greenish, ner\ eless above, somewhat 2-ribbed 

 atbase.— Prodr. v. 173; Torr. & Gray, El. ii. 90 (var. Texmse, which does not differ) ; 

 Gray, PL Lindh. ii. 219; Griseb. Fl. W. Ind. 360. E. B<-rlandlni, DC. 1. c. 167. E. lind- 

 heimi'riiiiiiun, Scheele in Linn. xxi. 599. Bnlbosti/tis ddtoides, Buckle\- in Proe. Acad. Philadf 

 1861, 45C. — Rocky shaded hills and ravines, Texas, Lindheimer, Wriqht, &c. ; fl. Nov. to 

 May. (W. Ind., Mex.) 



-1- -h- Herbaceous perenniak, or the first species barely lignescent at base. 

 ++ Corolla wholly glabrous oven in the bud. 

 ~B. OCCidentale, Hook. Minutely puberulent, giabrate : stems 8 to 20 inches hio-h, strict" 

 simple or with few ascending brandies: leaves ovate with truncate base, rarclv subcordate 



