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* Involucres more or less broadly turbinate, not nerved or angled, 4 to S8-toothed or 
lobed : bracts foliaceous, rarely somewhat ternate. 
+ Achenes membranaceously winged: leaves alternate, long oblanceolate. 
1. B. alatum Torr. Loosely silky-villous throughout, or the leaves nearly glab- 
rous except on the margin and midrib: involuecres pedunculate, solitary, with 5 erect 
teeth: flowers 2 mm. long, yellow, nearly glabrous, abrupt at base: achene winged its 
whole length.—From western Texas to Arizona and Nebraska. 
2. BE. hieracifolium Benth. Hoary-pubescent throughout and leaves usually 
tomentose beneath: flowers pubescent, yellow or rose-colored, 3mm. long (or 4 mm. 
in fruit), abruptly narrowed at base: achenes 5mm. long, winged above the mid- 
dle.—Western Texas and the Rio Grande Valley. 
+ + Achenes not winged, 
++ Flowers glabrous, 
3. BE. umbellatum Torr. Tomentose: leaves glabrous or glabrate above, oblanceo- 
late or spatulate: involucres deeply lobed, the lobes becoming reflexed: umbel 
simple, of 2 to 10 naked rays on naked (rarely 1-bracted) peduncles: flowers elon- 
gated at base, yellow or yellowish, 4 to 6mm. long.-—Extending into northern Texas 
from the far north and west. 
4. BE. Abertianum Torr, Stout and leafy often tall annual, silky-villous, di- or 
trichotomously branched: leaves ovate or subcordate: involucre lobed or parted, 
long-pedunculate: flowers rose-colored, the outer sepals round-cordate, at length 
4 mm. broad, the inner linear-obloug.—In the Chenate, Limpia, and Guadalupe 
Mountains. 
dD. EB suffruticosum Watson. Perennial, very much branched and woody, 10 to 
15 mm. high, eanescent: leaves finely silky tomentose both sides, fascicled and more 
or less revolute, oblanceolate, acute, attenuate to a short petiole, 4 to 8 mm, long: 
peduncles simple or sparingly dichotomous, 2 to 2.5 mm. long, with small linear bracts: 
involucre solitary, 6-eleft: flowers few, small (2 mm. long), pinkish; the outer seg- 
ments round-reniform, at length reflexed; the inner oblanceolate, obtuse, erect.—On 
the foothills of the Bofecillos mountains. 
++ ++ Flowers pubescent. 
6. BE. longifolium Nutt. Tall perennial, hoary pubescent throughout and the 
leaves tomentose beneath: involucre and flowers densely white-silky: flowers mostly 
herbaceous, 3 mm. (becoming 4to 6 mm.) long: achene 4 mm. long, pubescent above. 
—From Texas to Indian Territory and Florida. The tapering roots are very astrin- 
gent and probably contain tannin. 
7. E. Jamesii Benth. Rather slender, herbaceous, with branching caudex, 3 dm, 
high or less, white-tomentose: leaves and conspicuous bracts oblong-lanceolate, the 
latter shortly petiolate: involucres solitary, sessile, with 5 erect teeth on a naked 
pedunele: flowers whitish silky.—Hillsides and arroyos of the Upper Rio Grande 
and its tributaries. Var. FLAVESCENS Watson is stouter and has yellow or yellowish 
flowers (£. flavum, var. vegeltius T. & G.). 
** Involucres campanulate or short turbinate, not nerved or angled, with 5 rounded erect 
teeth, pedunculate in diffuse repeatedly di- or trichotomous panicles: bracts not foliaceous, 
all ternate: flowers not attenuate at base. 
+ Leaves tomentose. 
++ Stems simple, leafy, naked above: inflorescence cymose: flowers glabrate. 
&. E. annuum Nutt. Stout, 6dm. high, white floccose-tomentose throughout: leaves 
oblong-lanceolate, acute at both ends, short-petioled, flat: bracts small, triangular: 
involucres densely white-tomentose; flowers 3 mm. long: sepals very unequal, the 
11874—No, 3—3 
