a01 
30. EB. bilobata Engelm. Slender, erect annuals, 2 to 4 dm, high: leaves linear- 
lanceolate, acute, entire, glabrate; stipular glands obsolete: involucres campanu- 
late, hairy without and within, denticulate; glands obcordate-bilgbed, with the 
white appendages twice longer and triangular acute: pods smooth: seeds ovate, 
acute-quadrangular, strongly tuberculate.—Extending from southwestera Texas to 
New Mexico and northern Mexieo, 
+ + Glands four or one. 
dl. E. bifurcata Kngelm. Glabrous: stem erect, dichetomous, over 3 dm. high: 
leaves ovate or obovate (2.5 em. long), on sleuder petioles, sharply serrate; glandu- 
Jar stipules small: involucres long-pedunculate, hairy in the throat, the lobes ovate, 
fimbriate, multifid; gland solitary, cymbiform, the broad appendages white and 
transversely emarginate: pod glabrous: seeds unknown.—-Moist places, valley of 
the Limpia. 
32. E. exstipulata Engelm. Erect-spreading, branched, minutely appressed 
pubescent (1.5 din. high): leaves lanceolate or lanceolate-linear (2.5 cm. long), 
sharply serrate, narrowed to a short petiole; stipular glands very minute: involu- 
cres solitary, with triangular-ovate timbriate lobes; glands 4, ovate subpeltate, with 
the white dentate appendages twice broader: pod glabrous, obtusely angled: seeds 
large (2 mm, long), subcubical, verrucose, and with 2 or 3 transverse furrows.— 
Western Texas. 
** Stems allernately branched: involucres axillary and terminal, with 4 glands: seed 
strongly sulcate. 
33. E. Nealleyi Coult. & Fisher. Densely puberulent throughout: stems slen- 
der, erect or ascending (2 to8din. high), branched or simple at the woody base, with 
few alternate branches above: leaves opposite, linear-lanceolate (2 to 3 cm. long, 
1 to 1.5 mm. wide), entire, short-petioled, thickish, acute and cuspidate; glandular 
stipules minute: involucres solitary, peduneled, turbinate; glands transversely 
oblong, with large white irregularly dentate-truncate appendages: pod rather 
depressed, about 3 mm. broad: seeds ovate-triangular, deeply and irregularly trans- 
versely suleate.—Western Texas (Nealleys, With the general appearance of £, 
biformis, and apparently intermediate between § ZYGOPHYLLIDIUM and § ALECTOROC- 
TONUM. 
$3. Erect annuals: uppermost leaves with conspicuous white margins and whorled or oppo- 
site, the others scattered, equal at base, entire, sessile; lanceolate deciduous stipules: the 
5-lobed involucres in an umbel-like inflorescence, with 5 peltate glands.—PETALOMA. 
34. E. marginata Pursh. Stem stout (6 to 9 dm. high), hairy, densely leafy: 
leaves ovate or oblong, acute, about 8 to 6 cm. long: involucre hairy without and 
within; glands transversely ovate, with the broad and white appendages entire and 
thick-margined: pod hairy: seeds ovate, tuberculate.—Throughout the valleys of 
the Pecos and Rio Grande. 
35. E. bicolor Engelm. Stems leafy, hirsute: leaves oblong-lanceolate or linear- 
oblong (about 3 to 4 em. long), acute, appressed pubescent on both sides; the floral 
numerous, very long linear-lingulate, with a reddish- white margin: involucres short- 
pedicellate; glands with appendages pale-red, large, with repand and thickened 
margin: pod large and lanate: seeds sparsely tubercled.—Rich plains, from Arkansas 
to Dallas, Tex. 
§4. Only the uppermost leaves whorled or opposite: erect perennials, with entire leaves 
sessile and equal at base, and no stipules: involucres terminal and in the forks of the 
branches: inflorescence umbellate,—TITHYMALOPSIS. 
36. EH. corollata L. Glabrous or sometimes sparingly hairy (6 to 9 dm, high): 
leaves ovate, lanceolate or linear, obtuse or retuse (5 to 6cm. long): umbel 5 (3 to 7) 
