O74 
outer oblong-obovate.—Western Texas, in the mountains and on the tributaries of 
the Rio Grande. 
9. B. multiflorum Benth. Tall, stout, white-tomentose: leaves lanceolate, sessile, 
and somewhat anricled at base, smoother above, with undulate margin: involucres 
smoother: flowers 3mm. long: outer sepals round-cordate.—On the Rio Grande, from 
El Paso to the mouth. 
++ ++ Branching: leaves radical or at least the peduncles leafless: flowers glabrous. 
10. EB. cernuum Nutt. Glabrous, low, diffuse: leaves broadly ovate, acute: invol- 
ucres turbinate-campanulate: pedicels deflexed: flowers white or tinged with rose: 
outer sepals oblong or broader above, retuse.—From western Texas to Arizona, 
11. B. rotundifolium Benth. Glabrous, low, slender, diffuse: leaves round- 
ovate, often subcordate at base, on slender petioles: pedicels erect or somewhat 
spreading: flowers white, becoming 3mm, jong, the outer sepals very broadly dilated 
above.—Rocky ravines along the Rio Grande and in fhe Gaudalupe and Chenate 
mountains. April to June. 
12. BE. tenellum Torr. Tall, densely white-tomentose: branches of the woody 
caudex short and crowded or elongated: leaves ovate or rounded, tomentose on both 
sides: inflorescence rather sparingly branched: flowers white or pinkish* outer 
sepals broadly obovate or orbicular, the inner linear-oblong.—Mountains and canons 
of the Rio Grande and along the San Pedro. Var. CAULESCENS T. & G, is leafy 
from a lignescent root, has ascending branches (10 to 25 cm, long), often larger 
leaves (with blade 1.5 em. long), and more ample flowering panicle, (£. platyphyllum 
Torr. )—Central and southwestern ‘Texas. 
++ ++ Leaves not tomentose, radical. 
13. E. trichopes Torr. Glabrous, diffusely much-branched and very slender, 
the stem rarely inflated: leaves pubescent: bracts very small: involucres minute: 
pedicels 6 to 12 mm, long: flowers yellowish, pubescent, 1mm. long: sepals ovate- 
lanceolate, acute.—Dry ravines and rocky banks along the Rio Grande, from E] 
Paso to the Great Cafion, and rocky places at Howards Springs. 
14. BE. Nealleyi Coulter. Perennial. with woody caudex, the loosely branching 
stems as well as pedicels and flowers glabrous: leaves more or less broadly spatulate, 
tapering into a long petiole, villous-pubescent on both surfaces, 5 to 7.5 cm, long: 
involucres few and long-pedunculate: flowers greenish, occasionally with a pinkish 
tint: sepals lanceolate to ovate, the inner ones usually shorter and broader.—Near 
Pecos City. 
* * * Involuercs eylindric-turbinate, more or less strongly 5 or 6 -nerved and often becom- 
ing ribbed or angled, with as many short erect teeth, sessile in heads or clusters or scat- 
tered in cymes or along virgale panicled branches: bracts ternate, connate at base, more 
or less rigid: flowers not attenuate at base. 
+ Leaves at base. 
15. BE. Havardi Watson. Perennial, with very short branching caudex: leaves 
oblong lanceolate, acute, acuminate, petioled, densely tomentose beneath and silky 
above, 2.5 todem. long: peduncle slender, 3 to6dm, high, glabrous, sparingly dichot- 
omous above: involucres solitary, long pedicellate, broadly turbinate, glabrate, 
2mm, (or more) long: calyx densely silky, with narrow acute lanceolate segments, 
2mm. long, yellowish,—Western Texas, in the Chenate and Bofecillos mountains, 
and at Camp Charlotte (Ixion County). 
+ + Stems leafy. 
++ Flowers glabrous: leaves white-lomentose beneath. 
16. E. microthecum Nutt. Low and diffuse perennial, 1 to 3.dm, high, more or 
less white-tomenutose: leaves oblanceolate to linear, 1.5 to 5 em, long, revolute, be- 
coming glabrate above: involucres mostly solitary in a repeatedly di- or trichoto- 
