Additional species of Opuntia 
DAVID GRIFFITHS 
(WITH PLATE 30) 
Plants of the following species have been growing in our 
collections for the past five to eight years. Some of them have 
been held under provisional names for a long time in the hope that 
they might eventually be referred to species already described. 
They can not, however, be so referred and must receive new 
names. 
v Opuntia columbiana sp. nov. 
A low, half prostrate species, seldom over 15 cm. high; the 
distal joints mostly erect, the ones on the ground rooting freely; 
joints narrowly obovate, about 5 X 15 cm. in last year’s growth, 
at first yellowish to medium light green but the second year be- 
coming decidedly yellowish green, slightly raised at areoles, fragile, 
and easily broken, making it very difficult to grow plants to 
maturity; areoles subcircular to obovate, 2 mm. long, enlarging 
in age and prominent, 2 mm. high on account of the profuse 
development of wool, light brown; spicules yellow at first, in a 
compact tuft 1 to 1.5 mm. long in upper part of areole, later, 
especially the second year, becoming unequal and scattering, 
and 5 mm. or more in length; spines yellowish to white, centrals 
one to three with one long, porrect or sloping down 3-4 cm. long 
and the other one or two 2 cm. long and widely spreading, and 
commonly three or four about 1 cm. long in the lower angle of 
the areole tightly recurved, often there are two or three porrect- 
spreading, long spines, and the others (three short and about two 
2 cm. in length) all tightly recurved; flowers light yellow, fila- 
ments reddish brown, style white, stigma light green. 
This species is apparently confined to the sandy lands along 
the Columbia and Snake River valleys, and is particularly abun- 
dant near Pasco, Washington. The above description applies to 
my inventory No. 10041, from Pasco, Washington, but the spines 
vary greatly in color, and associated with this difference in color 
of the spines is a comparable difference in coloration of the plant 
body. Specimens collected under my inventory No. 10042 have 
