100 COMPOSITtE. EuiMtorium. 



base; some of them alternate. — E. truncatum, Muhl. in Willd. Spec. iii. 17.51. E. salvice- 

 fo'inm, Sims, Bot. Mag. t. 2110. — With the normal form. 



Var. CUneatum, Exgelm. (E. cuneatum, Engelm. in Torr. & Gray, 1. e.), with 

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

 appearance of being a hybrid between E. semiserratum and E. perfoliatum. — Eastern Ar- 

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

 preceding. 

 E. resinosum, Torr. 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, glabrate above, canesceut beneath ; 

 cymules numerous in compound cymes: bracts of the lO-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 b}' Bartrum. 



^— ^— -)^ -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. 



Ej. pycnocephalum, Liss. 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. Schiede- 

 anum, Schrad. Ind. Sem. Hort. Goett. 1832, 3; DC. Prodr. v. 159. E. multiiierve, Benth. 

 PI. Hartw. 76. E. So))07-(e, Gray, PL 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. Schiedeunum, var. (jrosse-deiitatum, Gray, Bot. Mex. Bound. 

 76. (Mex., &c.) 



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

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

 petioled. — § Eximbricata, DC. 



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



E. ^W^rightii, Gray, 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), al)0ut 12-flowered, rather 

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

 10 oblong-lanceolate acute or o])tusish greenish obscurely 3-nerved and ecpial bracts in a 

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

 Guadalupe Mountains, western borders of Texas, Wright. 



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

 deltoid, rather obtuse, sparingly serrate or some entire, tomcutulose 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 half the length of the fully developed flowers, of 

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

 n. 196. E. Cuhense, DC. 1. c.l—S. Florida, Blodijett, Garber, Cttrtiss, &c. ( W. Ind.) 



E. a.geratif61iuin, DC. Shrub 3 to 7 feet high, with slender and spreading mostly herba- 

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

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

 (5 lines long), pedicelled, numerous in corymbiform cymes, 10-30-flowered : invohu-ral bracts 

 8 to 12, narrowly lanceolate or linear, acutish, greenish, nerveless above, somewhat 2-ril)bed 

 at base. — Prodr. v. 173; Torr. & Gray, Fl. ii. 90 (var. Terense, which does not differ); 

 Gray, PI. Lindh. ii. 219; Griseb. Fl. W. Ind. 360. E. Berlandicri, DC. 1. c. 167. E. Lind- 

 heimerlamun, Scheele in Linn. xxi. 599. Bulbostylis deltoldcs, Buckley in Proc. Acad. Philad. 

 1861, 456. — Rocky shaded hills and ravines, Texas, Lindlicimer, Wright , &c. ; fl. Nov. to 

 May. (W. Ind., Mex.) 



H— ■'c— Herbaceous perennials, or the first species barely lignescent at base. 

 ++ Coi'oiha wliolly glabrous even in the bud. 



E. OCCidentale, Hook. Minutely puberulent, glabrate : stems 8 to 20 inches high, strict, 

 simple or with few ascending branches : leaves ovate with truncate base; rarely subcordate 



