192 UNITED STATES AND MEXICAN BOUNDARY. 
(No. 529 and 698;) Drummond, (Coll. II, No. 331.) If E. peploides, Gouan, of Southern 
Europe should prove to be a distinct species, Scheele’s name must stand for ours. 
. EUPHORBIA BRACHYCERA (nov. spec.): annua (2), multicaulis, ramosa, erecta, glaberrima; foliis 
in petiolum brevissimum angustatis lanceolatis seu lineari-lanceolatis acutis mucronatis ; umbella 
3-fida seu raro 4—5-fida; ramis pluries bifidis; bracteis inferioribus ovato-lanceolatis superioribus 
rhombeo-orbiculatis mucronatis; glandulis brevissime obtuseque cornutis; seminibus majusculis 
ovatis maculis irregularibus sepe confluentibus leviter impressis. Western New Mexico; Wright, 
(No. 1821.) Many stems a foot high from a stout but apparently annual or biennial root ; 
leaves 6-9 lines long, about 2 lines wide, patulous (not erect as in E. esulewformis) regularly 
lanceolate; upper part of the stem quite ramose ; horns shorter than іп any of our species, and 
sometimes almost rudimentary. Seed 1 line in length, similar to those of E. esuleformis, 
montana and Roemeriana. 
EUPHORBIA MONTANA (nov. spec.): perennis, glaberrima ; caulibus pluribus ascendentibus ; foliis 
brevibus lanceolatis ovatis obovatis seu suborbiculatis acutis seu obtusis basi subinde subcordatis 
subsessilibus coriaceis glaucis; bracteis omnibus orbiculato-triangularibus, rarius subcordatis, 
superioribus subinde transverse ovato-triangularibus, omnibus cuspidatis ; glandulis semilunatis, 
cornubus triangulatis brevibus; seminibus maculis plus minus impressis obscuris confluentibus 
undique notatis. 
G GRACILIOR : caule tenuiori; foliis minoribus suborbiculatis obovatis seu lanceolatis. 
Û ROBUSTA : caule robustiore; foliis bracteisque majoribus crassioribus late ovatis seu ovato- 
cordatis. | 
The var. а in New Mexico; Fendler, (No. 786;) Wright, (No. 661, 1825.) San Luis 
Mountains, Sonora; Capt. E. K. Smith. Stems 4-8 inches high, leaves 2-3 lines long, in 
young specimens imbricate and red. 
Var. f, on the upper Platte; James, Nuttall, Frémont ; is a much stouter plant. Leaves 5-6 
lines long, seeds larger. Dr. Wislizenus collected intermediate specimens near Albuquerque. 
EUPHORBIA CRENULATA (nov. spec.): annua, erecta, glaberrima ; foliis obovatis acutis in basin 
attenuatis minute crenulato-serrulatis mucronatis; umbella 5-fida, bracteis inferioribus late 
ovatis acutis, superioribus transversis, omnibus tenuiter serrulatis mucronatis ; involucri 
glandulis longe tenuiterque cornutis; seminibus ovato-subglobosis cinereo-fuscis, maculis 
obscurioribus irregulariter confluentibus parum impressis. California; Hartweg, (1950.) Near 
Monterey ; Dr. Parry. About 1-2 feet high, simple or branching above ; leaves about 9 lines 
long, 5 lines broad, involucells broader and shorter; seed nearly a line long, unusually dark 
for this section. One of the very few peploid Euphorbiz with crenate leaves. 
EUPHORBIA ESULAFORMIS, S. Schauer in Linnea, 20, p. 729. Near the Copper Mines, New 
Mexico; Wright, (No. 1820;) Bigelow. On the Nueces, western Texas; Wright. San Luis 
Mountains, Sonora ; Capt. E. K. Smith. This species seems to be scarcely distinguishable from 
the Mexican E. campestris; Schlechtendal. The original specimen of the latter, however, has 
longer and more slender horns; the seeds are wanting. The original specimen of E. esuleformis 
has similar but smaller seeds than our plant; the horns are also very short and incurved, the 
gland itself is truncate and notched. Euphorbia brachycera and E. montana come very near to 
this species. 
Var? sUBDENTATA: foliis oblongo-linearibus brevissime petiolatis, inferioribus integris obtusis, 
superioribus versus apicem mucronatum dentatis, bracteis ovatis obtusis вере grosse dentatis. 
