388 
and mucronulate at apex, short-petioled from an attenuate base; stipules subulate: 
involucres campanulate, on long pedicels, the short lobes ciliate; glands sub. 
orbicular-concave, with the ovate entire appendages three times as broad: pod some- 
what depressed trisuleate: seed globose, subquadrangular (£. arenaria Engelm.)— 
From Tom Green County through central and southern Texas. 
11. E. polyclada Boiss. Many-stemmed from the base (10 to 15 em. high), diffuse 
or ascending, dichotomously branched, with capillary branchlets: leaves short- 
petioled, oblong or oblong-elliptical (6 mm, long), obtuse and mucronulate, from a 
scarcely equal rounded base; stipules 2 or 3-parted into subulate divisions: involu- 
cres small and turbinate, on long dichotomous pedicels, with the short triangular 
lobes strongly barbed; glands transversely ovate, entire or obtusely 2 or 5-lobed: seed 
obscurely triangular.—Texas, 
12. B. serpens HBK. Stems filiform, prostrate and often rooting: leaves round- 
ovate, obtuse or cordate at base (only L to 3 mim. long); stipules membranaceous, 
triangular: peduncles much longer than the petioles, at length in loose foliaceous 
lateral clusters; glands with minute crenulate appendages: pods acutely angled: 
seeds obtusely quadrangular, Limm, Jong or less.—Rich soils, along the Pecos and 
lower Rio Grande. Var. FLEXICAULIS (J2. flecicaulis Scheele. L. serpens, var. radi- 
cans Eng.) has much smaller leaves broadly ovate or ovate-oblong, and stems rooting 
from the lower side,—From Corpus Christi to Sutherland Springs. 
13. B. cordifolia Ml]. Prostrate, with stems 1.5 to 2 dm. long: leaves pale green, 
oval or roundish, obliquely truncate or cordate at base; stipules slender, deeply 
parted into long capillary segments: gland-appendages conspicuous, oblong or 
roundish, white: pods acutely angled: seeds quadrangular.—Extending from the 
Gulf States into Texas. 
ve 4+ Glabrous perennial, 
14. E.albomarginata T. & G. Slender andimuch branched: leaves suborbicular, 
subcordate, distinctly petiolate: involuere shorter than the peduncles; glands trans- 
versely oval, with an entire or slightly crenate border which is twice as broad as 
the gland itself: sceds obovate, somewhat rugose transversely, dull, gelatinous 
when moistened.—Common throughout southern and western Texas. 
+ + Seeds minutely roughened, transversely wrinkled, or pitted, 
++ Leaves serrate or serrulate: mostly annuals. 
= Pubescent: involucres mostly racemose. 
15. EB. Serrula Engelm. Spreading or decumbent: stems 1 to 1.5 dm, high, clothed 
with long spreading hairs: leaves coarsely and sharply serrate, oblong (often faleate), 
6 to 10 mm. long, obtuse, from an obtuse or subcordate strongly oblique base, pilose 
beneath; stipules lanceolate, laciniate: involucres axillary, the transversely oblong 
glands with the appendages somewhat broader, obsoletely lobed: pods large, glabrous: 
seeds acutely quadrangular, minutely tuberculate.—Western Texas and New Mexico, 
16. EB. grisea Engelm. Erect and appressed-pilose; stems (1 to 1.5 dm. high) fili- 
form, subsimple, from an indurated rootstock, with elongated internodes: leaves 
subsessile from a strongly cordate base, rhombie-triangular, subfaleate (6 to 8 mm. 
long), the lower smaller, all acutely caleareo-crenulate; stipules subulate, fimbriate: 
involucres axillary, 2 to 5-glomerate, narrow tarbinate, the giabrous lobes fimbriate; 
glands transversely oblong, reddish, the appendages repand-lobed, glabrous: pods 
pubescent, obtuse-angled: seeds ovate, obtusely quadrangular, obscurely rugulose.— 
From Monterey to Matamoras, Mexico, and doubtless to be found on this side of the 
Rio Grande. 
17. B. stictospora Engelm. Pubescent and prostrate: stems 1 to 1.5 dm. long: 
leaves rounded, subcordate, sharply serrate, 4 to 8mm. long: racemes crowded with 
very smal] and slender long-peduncled invelucres; glands narrowly appendaged: podg 
