1898] EUPHORBIAS OF DR. PALMER'S DURANGO COLLECTION 25 
very characteristic, and agree with J. G. Lemmon’s Huachuca 
mountains and C. Mohr’s Gila river (Arizona) forms. 
S$ TirHyMALuvs. 
EUPHORBIA CAMPESTRIS Cham. & Schl. Linn. 84: 1830. 
In this species the fifth gland is replaced by a triangular 
pointed lobe, broader at the base than the involucral lobes, which 
are in part triangular and 
part fusiform with a bifurcate 
apex. The seed is oval, len- 
ticular in section, 2™ long, 
1.3™" broad, dark brown, the 
surface reticulate with 
rounded anastomosing whit- 
ened-farinose ridges. Car- 
uncle conical stipitate, 
deeply notched on the ven- 
tral surface. 
Dr. Palmer’s 72 Durango 
is the typical form of the species, with long virgate branches 
denuded below and terminated by numerous narrowly-lanceolate 
mucronate-tipped leaves, and a single 3—5 flowered umbel. 
FIELD COLUMBIAN MUSEUM, 
Chicago. 
