438 EUPHORBIACEA OF THE MEXICAN BOUNDARY. 
B Ropusta: caule robustiore; foliis bracteisque majoribus crassioribus late ovatis seu ovato-cordatis. 
The var. a. in New Mexico; Fendler (No. 786); Wright (No. 661, 1825). San Luis Mountains, Sonora; Cape. 
E. K. Smith. Stems 4-8 inches high, leaves 23 lines long, in young specimens imbricate and red. 
Var. 8. on the upper Platte (James, Nuttall, Fremont) is a much stouter plant. Leaves 5-6 lines long, seeds 
larger. Dr. Wislizenus collected intermediate specimens near Albuquerque. 
EUPHORBIA CRENULATA, 7. sp.: annua, erecta, glaberrima; foliis obovatis acutis in basin attenuatis minute 
crenulato-serrulatis sveiseunialan ; umbella 5-fida, bracteis inferioribus late ovatis acutis, superioribus transversis, omni- 
bus 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, 
‘ivoldncts broader and shorter; seed nearly a line long, unusually dark for this section. One of the very few peploid 
Euphorbie with crenate leaves. 
UPHORBIA ESULZFORMIS, 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 #. campestris, Schlechtendal. The original he 
men of the latter, however, has longer and more slender horns ; the seeds are wanting. The original specim 
eswleeformis has similar but smaller seeds than our plant ; the horns are also very short and incurved, the aland itself 
is truncate and notched. Euphorbia brachycera and E. montana come very near to this species 
Vark.? SUBDENTATA : foliis oblongo-linearibus brevissime petiolatis, inferioribus tats obtusis, supe- 
rioribus versus apicem mucronatum dentatis, bracteis ovatis obtusis seepe grosse dentatis. San Francisco Spring, [193] 
Sonora ; Parry. The seeds were not ripe. This is, perhaps, a distinct species, but it must remain as a variety 
until more complete specimens are obtained. 
EvprHorsia Latuyris, Linn., is somewhat naturalized around Monterey, California. It was doubtless intro- 
duced by the Spaniards. We have it also from Saltillo, Mexico, where it was collected by Gregg. 
§V. SPARSIFLORA. 
EvPHorBIA MISERA, Benth. Bot. Sulph. p.51. Near the sea, San Diego, eepieats Parry. <A straggling bush, 
about 3 feet high, abounding in a milky juice. — found it at Santa Bar 
EUPHORBIA ANTISYPHILITICA, Zucc. Acad. Mon, 1, p. 292. Rocky and one? hills along the Rio Grande, from 
the Presidio del Norte to Laredo; siti Schott, emarkable for its long terete nearly leafless branches, which 
resemble an Hquisetum or an Ep 
ROTON FRUTICULOSUM, Engelm. mss.: caule basi fruticoso; foliis ovatis vel lanceolato-ovatis acumi- [194] 
atis acutisve subcordatis remote minutissime denticulatis eglandulosis supra viridis puberulis subtus aie 
echacaaakiaes us; floribus monoicis pedicellatis, masculis racemosis 10-5-andris 5-petalis, fom 
sea stylis profunde bipartitis, laciniis elongatis filiformibus. Mountain sides and rocky ravines, ees [195] 
xas; Chihuahua and Sonora. (No. 639 and 1803, Wright); the latter a diwcious form. No. 176, 177, and 
pion reo. 1846; No. 134 ae 297 coll. 1847, Lindheimer. No. 3212, Berlandier, in part ; the specimens with hairy 
fruit being C. trichocarpa, Torr. Leaves 1 to 2} inches long, and half an inch to an inch wide, pubescence of the 
under surface often of a gear BOE. tinge. Inflorescence terminal and axillary in the upper leaves. Staminate flowers 
10-20 or more. Petals 5, oblong. Stamens exserted; filaments smooth. Disk 5-lobed, glandular. Fertile flowers 
usually 2, sessile, apetalous; disk indistinct. Capsule globose-trigastric, covered with a short canescent stellate 
pubescence.* 
* Supplementary Notes on Euphorbiacee of the Boundary appear in another paper, p. 440, note. — Eps. 
