380 
pubescent, sharply angled: seeds slender, sharply quadrangular, rugose-dotted,— 
Common in western Texas. 
18. BE. humistrata Engelm. Procumbent, puberulent or hairy: leaves oblong- 
linear (4 to 10 mm. long), very oblique at base, serrulate towards the apex, sparsely 
hairy beneath (sometimes with a brown spot above); stipules lanceolate, fimbriate: 
peduncles rather shorter than the petioles, in dense scarcely foliaceous lateral clus- 
ters: involucre cleft on the back, its (red or white) appendages truncate or crenate: 
pods sharply angled, puberulent: seeds ovate, obtusely angled, minutely roughened 
(1 mm. long).—Rich soils, extending from the Mississippi States to eastern Texas. 
19. E. maculata L. Prostrate: stems puberulent or hairy: leaves oblong-linear, 
very oblique at base, serrulate upward, more or less pubescent or sometimes sinooth- 
ish (8 to 12 mm. Jong), usually with a brown-red spot in the center; stipules lanceo- 
late, fimbriate; peduncles as long as the petioles, in dense foliaceous lateral clusters : 
glands of the small involucre minute, with narrow slighly crenate (usually red) 
appendages: pods acutely angled, puberulent: seeds ovate (0.8 mm, long), sharply 
4-angled, and with about 4 shallow grooves across the concave side.—From the 
valleys of the Pecos and Rio Grande to central Texas, 
20. E. prostrata Ait. Prostrate, very diffuse, woolly and villous puberulent: 
leaves of two sizes (6 to 10 and 4 to 6 min. long), roundish oval, very obtuse at both 
ends, denticulate near the apex, sparsely hairy beneath: peduncles crowded in 
lateral clusters, longer than the very short petioles: involucral appendages obtuse, 
entire, the lobes pectinate-ciliate: pod acutely angled, woolly: seeds grayish, deeply 
5 to 7-grooved.—F rom Louisiana through Texas to Mexico, 
21. BE. adenoptera Bertol, Annual or perennial prostrate much branched 
woolly plants, often from a thick indurated base: leaves oblong (5 to 12mm. long), 
denticuliate and obtuse or acute, strongly oblique at base, short petioled; stipules 
linear, ciliate: involucres subsessile, solitary or 2 or 3 in a close axillary fascicle; 
appendages very unequal, rose-colored, the larger semi-ovate, auricled, repand, the 
smaller scarcely as broad and often obsolete: pod white- hirsute, acutely angled: 
seeds acute-quadrangular, pinkish, transversely 5 to 7-grooved.—From the Upper 
Rio Grande to the plains of Chihuahua, 
= = Glabrous: imvolucres solitary. 
22. BE. serpyllifolia Pers. Prostrate, spreading: leaves obovate. oblong, narrowed 
at the very oblique base, sharply serrulate towards the obtuse apex (6 to 12 mm. long), 
often with a red spot; stipules lanceolate, fimbriate: peduncles as long as the 
petioles or longer, at length in loose foliaceous lateral clusters: glands of the small 
involucre with narrow somewhat toothed appendages: pods sharply angled: seeds 
acutely quadrangular, slightly cross-wrinkled, often pitted, nearly 1.5 mm. long.— 
Extending from the northern prairie States through Texas to Mexico. Var. CoNn- 
SANGUINEA Boiss. is somewhat erect, with obtuse sharply serrate leaves, and ovate 
depressed-punctate seeds, (2. consanguinea, £. subserrata, E. notata, and E. inequilatera 
Engelm).—From Kansas to Texas. 
23. BE. glyptosperma Engelm. Glabrous (or very rarely puberulent), erect and 
spreading: leaves linear-oblong, mostly falcate, very unequal at base, slightly ser- 
rulate towards the obtuse apex (4 to 10 mm. long); stipules lanceolate, setaceously 
divided: peduncles as long as the petioles, in dense foliaceous lateral clusters: 
glands of the very small involucre with narrow crenulate appendages: pods sharply 
angled: seeds sharply quadrangular and with 5 or 6 sharp transverse wrinkles.— 
From the Guadalupe to the Lower Rio Grande and the Pecos. War. TENERRIMA 
Engelm. has much smaller leaves (2 to6 mm. long, 1 to2 mm. broad) scarcely crenulate 
at apex, and minute involucre with the glands scarcely or not at all appendiculate,— 
On the Rio Grande and the Arkansas, 
11874—No. 3-—-—4 
