179 
serrate or dentate, slender-petioled : cymes small and compact, solitary or clustered 
at the end of naked branches: involucral bracts mostly glabrous, very obtuse.— 
Along the Mexican border, 
*** Involuere (campanulate or oblong) of bracts all of the same length or nearly go, in 
1 or 2 series, or with only a few accessory and shorter ones at base: leaves mainly 
opposite and petioled. 
+ Shrubby, freely branched: flowers white or purplish. 
13. BE. Wrightii Gray. Puberulent, 3 to 6 dm. high, with very leafy branches: 
leaves small (12 mm. long), ovate, obtuse, entire or obscurely few-toothed, thickish, 
scabrous, abruptly contracted into a short margined petiole: heads 6 to 8 mm. long, 
about 12-flowered: involucral bracts oblong-lanceolate, obscurely 3-nerved.—Guada- 
loupe and Chisos Mountains. 
Ht. B. ageratifolium DC. Shrub 9 to 20 dm. high, with slender and spreading 
mostly herbaceous branches, green and nearly glabrous: leaves deltoid-ovate, obtus- 
ish or obtusely acuminate, coarsely and rather obtusely dentate, 5 to 7.5 em. long, 
slender-petioled: heads 10 mm. long, 10 to 30-flowered: involucral bracts narrowly 
lanceolate or linear, nerveless wbove, somewhat 2-ribbed at base.—Rocky shaded 
hills and ravines, central and western Texas. Var, ACUMINATUM Coulter has the 
branchlets, lower leaf-surface, and involucral bracts finely and often densely pubes- 
cent, and the leaves smaller and sharply acuminate.—Point Isabel. 
+ + Herbaceous perennials, 
15. B. incarnatum Walt. More or less pubescent: leaves deltoid, or ovate-lance- 
olate with broad truncate or cordate base, coarsely crenate or serrate, 2.5 to 5 em. 
long, slender-petioled: cymes small: heads about 20-tlowered : corolla pale-purple 
or white, wholly glabrous even in bud: involucral bracts unequal,—Extending west- 
ward into Texas at least to Gillespie County. 
16. H. ageratoides L. f. Nearly glabrous, sometimes pubescent: leaves ovate 
with truncate or subcordate or broadly cuneate base, coarsely and rather sharply 
dentate-serrate, 7.5 to 12.5 cm. long, long-petioled: cymes ample: heads 15 to 30- 
flowered: corolla pure white and more or less bearded outside: involucral bracts 
nearly equal.—A common species of the Atlantic States, which reaches central and 
western Texas as var. ANGUSTATUM Gray, which is smaller, with leaves from ovate- 
lanceolate to broadly lanceolate, much acuminate, coarsely serrate with only 3 to 6 
teeth on each margin, commonly cuneate at base, and heads only 8 to 12-flowered. 
$3. Receptacle conical or hemispherical: otherwise as in * * * of § 2: perennial herbs. 
17. BE. coelestinum L. (Mist-FLOWER.) Somewhat pubescent: stems erect, 
branched at summit: leaves deltoid-ovate or subcordate, obtuse or acutish, obtusely 
serrate (or with some coarser salient teeth), slen der-petioled: cymes rather compact: 
receptacle obtusely conical. (Conoclinium culestin um, DC.)—Extending from the 
Gulf States into Texas. 
18. E. betonicum Hemsl. From tomentose-villous to glabrate: stems lax, loosely 
branching: branches naked and pedunculiform at summit, bearing some small corym- 
bose or paniculate cymes: leaves oblong, mostly obtuse, crenate, petioled: recep- 
tacle low-conical. (Conoclinium betonicum DC.) —Mexican border of Texas. Var. 
SUBINTEGRUM Gray has the leaves sometimes truncate, commonly obtuse or cuneate 
at base, obscurely crenate, denticulate, repand or entire, from villous to nearly gla- 
brate. (C. betonicum, var. integrifolium Gray.)—Mexican border of Texas. 
19. E. Greggii Gray. Minutely puberulent: stems erect, 3 to 6 dm, high, bearing 
one or few small and dense cymes at the naked pedunculiform summit: leaves nearly 
sessile, palmately 3 to 5-cleft or parted, the divisions laciniate-pinnatifid into narrow 
lobes: receptacle low-conical. (Conoclinium dissectum Gray.)—Along the southern 
border of Texas, 
18430—No. 2——3 
