393 
dentate, the uppermost long-attenuate, and often paler at base: cymes densely corym- 
bose: involucres short-pedlicelled, cylindrical-turbinate, the glabrous lobes oblong 
lanceolate, 5 to 7-fimbriate-dentate; glands solitary, fleshy, substipitate: seeds- 
blackish, ovate with truncate base, irregularly tuberculate granular.—Along Texan 
side of the Rio Grande and in northern Mexico. 
87. Involucres in a terminal dichotomous or commonly umbellate inflorescence, 4 or 
5-lobed, with as many flat or convex entire or crescent-shaped glands: seeds carunculate: 
one species ascending or erect, mostly glabrous, and without stipules: mostly annuals.— 
TITHYMALUS. 
*Glabrous annual or biennial, with entire opposite and decussate leaves, an umbelliform 
inflorescence, and short-horned glands, 
44. B. Lathyris L. Stems stout, erect (6 to9 dm. high): leaves thick, linear to 
oblong, the floral oblong-ovate and heart-shaped: ambel 4-rayed, then forking: seeds 
ovate, reticulate-rugose.—Introduced into western Texas and New Mexico. 
* * Involucral glands transversely ovate, margin round, not truncate or 2-horned: stem- 
leaves scattered: inflorescence umbellate, 
+ Seeds smooth and even. 
45. BE. obtusata Pursh, Erect annual (6 to 12 din. high): leaves oblong-spatulate, 
minutely serrulate, smooth, all obtuse, upper ones cordate at base, floral ones ovate, 
dilated, barely mucronate: umbel once or twice divided into 3 rays, then into 2: 
involucre with naked lobes and small stipitate glands: styles distinct, longer than 
the ovary, erect, 2-clett to the middle: pod beset with long warts.—Extending into 
northwestern Texas from the Atlantic States, 
+ + Seeds rugose or recticulated, 
++ Pod warty. 
46, EB. dictyosperma F. & M. Glabrous annual: stem erect (2 to 4 dm. high): 
leaves membranaceous, oblong or obovate-spatulate, smooth, all obtuse and obtusely 
serrate, the upper ones cordate at base, the floral roundish ovate or obscurely cord- 
ate, slightly mucronate: umbels once or twice 3-forked, then 2-forked: involucre 
with nearly naked lobes and small sessile glands: styles shorter than the ovary, 
spreading or recurved: seeds delicately reticulated. (4. Arkansana Engelm.)— 
Western and central Texas. Var. MULTICAULIS is mostly biennial, with many erect 
or ascending leafy stems (1 to 2.5dm, high) froma woody base, oblanceolate or oblong- 
spatulate (not membranaccous) leaves with narrow base and-serrate above, obovate- 
lanceolate acute floral leaves, coriaceous pod warty only on the back of the valves, 
and smaller less reticulated seeds. (#2. multicaulis Engelm., excl. var. Mexicana En- 
gelm.)—Western Texas. (Pringle, in 1883.) 
++ ++ Pod smooth. 
47. BE. Helioscopia L. Stems ascending (1.5 to 3 dm. high), glabrate: leaves all 
obovate and very rounded or retuse at apex, finely serrate, smooth or a little hairy, 
those of the stem cuneate: umbel divided into 5 rays, then into 3, or at lsngth simply 
forked: glands orbicular, stalked: seeds with honeycomb-like reticulation.—Head- 
waters of the Trinity. 
48. B. Texana Boiss. Glabrous: stems numerous from the base, erect (1.5 din, high), 
branched above, the branches with 2 or 3 rays, mostly dichotomous: leaves obtuse, 
crenate, from a iong attenuate oblong-cuneate base; the floral oblong-elliptical, 
acutish, subentire: involucre hemispherical, the lobes ovate, retuse, glabrous: 
styles long, deeply bifid: pods depressed: seeds blackish, globose, with elevated 
reticulations. (4. dictyosperma, var. leiococca Engelm.)—Near the Colorado. 
