oud 
++ 4+ Leaves entire: mostly annwals. 
= Glabrous or glabrate. 
24. B. polycarpa Benth. Glabrous or somewhat finely pubescent: stems numer- 
ous from a perennial at length woody base, prostrate or ascending, 1 to 8dm, long: 
leaves round-ovate to oblong, obtuse or acutish, usually slightly cordate at base, 2 
to 6mm. long; stipules minute, triangular to lanceolate, ciliate: involucres mostly 
solitary in the axils, turbinate-campanulate; glands dark purple, sometimes yellow, 
the white or rose-colored crenate margin varying from narrow to broad and con- 
spicuous: pod small, with angled lobes: seeds oblong, 4-angled, about 2 mm, long, 
obscurely rugose (sometimes almost smooth).—From the Chenate mountains to 
Ringgold. Var. vestira Watson, of the Chenate mountains, is hoary and more or 
less tomentose throughout with short close pubescence. , 
25, E. Pendleri Torr. & Gray. Gilabrous, from a slender rootstock: stems 
delicately filiform, erect or decumbent, dichotomous, much branched (5 to 10cm, 
high): leaves ovate, obtuse, rounded at base; stipules subulate: involucres terminal, 
solitary, turbinate, slightly bearded in the throat, lobes short and fimbriate; glands 
transversely oblong, with a very narrow obscure appendage: pod somewhat 6-lobed, 
with obtuse angles: seeds ovate, d-angled, irregularly punctuate. (2. rupicola 
Scheele, not Boiss.)—Common in western Texas. Var, CHA TOCALYX Boiss. is taller 
and with elongated internodes, with ovate lower leaves, oblong-elliptical acute 
upper ones, and lateral glands with oblong-triangular appendages.—E1 Paso. 
26, B. revoluta Engelm. Glabrous: stems erect, filiform, naked below, much 
dichotomous above the middle, 10 to 12em. high: leaves narrowly linear (15 to 24mm. 
long) with revolute margins, attenuate below; stipules snbulate, entire: involucres 
very small, uppermost in the forks of the branches and terminal, short, eampanu- 
late; glands purple, with a whitish or reddish oblong appendage: pod glabrous: 
seeds oblong, sharply 4-angled, sparingly and irregularly rugose.—Along the Rio 
Grande. 
= = Pubescent or villous, 
27. EB. Laredana Millsp. Prostrate, densely leafy, white-viseid and villous: 
stems numerous, branching, 6to 12 em, long: leaves lanate, very obliquely cordate at 
base, obtuse, 2 to 5 nun, long; stipules not distinguishable on account of the densely 
lanate leaves: involueres solitary in the axils, minute, sessile, a snowy mass of white 
hairs, lobes triangular; glands transversely ovate, brownish green, without append- 
ages: pod glabrous near the base, sharply-angled: seeds pink, acutely 4-angled, 
strongly marked by 4 to 6 irregular sharp transverse white farinose ridges.—Laredo, 
28. BE. villifera Scheele. Villous with white spreading hairs: stems erect (1 to 2 
dim. high}, with several filiform reddish stems from the dark base: leaves short-peti- 
oled, ovate or ovate-triangular, from a very unequal subcordate base, obtusish, 
5to 6mm. long; stipules lanceolate, bifid or trifid: involucres solitary in the axils, 
and in the forks, turbinate-campanulate, with the ovate lobes white-hairy; glands 
with white or rose appendages twice as long: pod glabrous, depressed, sharply 
angled: seeds short ovate, d-angled, more or less obscurely interrupted rugose,— 
Limpia Cation, western Texas. 
2, Leaves opposite, on short petioles (except No. 30), notoblique, with stipular glands.— 
ZY GOPHYLLIDIUM. 
* Slems erect, dichotomous: cymes terminal: involucres with 1, 4, or 5 glands: seeds 
tuberculate. 
— Glands five. 
29, B. hexagona Nutt. Somewhat hairy (8 dm. or more high), with striate- 
angled branches: leaves linear-lanceolate, entire: involucre hairy without and 
within, the lobes short and multifid; glands 5, with green ovate-triangular append- 
ages twice their length: pod smooth, obtuse-angled: seeds ovate, tuberculate,— 
Extending from the north into Texas (on the Colorado River). 
