32 MISSOURI BOTANICAL GARDEN. 
native state. The plants at the time the description was 
drawn, about the middle of the third season’s growth, were 
four feet high, and had a total spread of eight feet and were 
hemispherical in outline. The type specimen consists of four 
sheets, bearing my collection number 9702, two prepared in 
the type locality, Loma Alta, Texas, May 18, 1909, and the 
other two consisting of a younger joint and flowers, prepared 
from a cultivated specimen grown from the type and pre- 
pared at Brownsville, Texas, May 18, 1911.—Plates 9, be- 
low, and 10. 
Opuntia undulata, sp. nov. 
Plant tall, large, stout, open branching, with cylindrical trunk, often 
80 cm. ormorein diameter; joints very large, obovate, broadly rounded 
above, widest above middle, commonly 35> 55 cm., firm, hard, quite 
fibrous, dished, wavy or flat, glossy light yellowish green at first, 
but changing through a darker green with a slight touch of glau- 
cous to scurfy brown on old trunks; leaves subcircular in section, 
subulate, pointed, usually tinged with red at the tip, about 4 mm. long, 
upon a prominent tubercle and subtending a prominent dark brown 
areole; areoles subcircular to ellipsoid or obovate, about 3.5 4.5 mm., 
gray, 5-6 em. apart; spicules yellow in a short compact tuft in upper 
part of areole, about 1 mm. long, soon becoming dirty and inconspic- 
uous; spines white, few, short, erect, flattened, straight or twisted, 
10 to 15 mm. long, 1 to 3 or 4, mostly one or none; fruit large, 
4-5 < 9-10 cm., dull red to slightly tinged with orange and pulp streaked 
with red and orange when rind is removed. 
The species is very distinct in general appearance from any 
other known to me. It should be placed with the large 
“mansa” spiny forms grown and cultivated all over Mexico — 
rather than with the ficus-indica group, although its spines 
are very few in number. Indeed it is nearly spineless, but 
not quite so much so as some of the O. ficus-indica group. 
The peculiarities of the joints, lacking the usual flat sur- 
face until old, the few spines, hard, firm, fibrous texture, and 
large size are its distinguishing characteristics. 
The species was secured in cultivation at Aguas Calientes, 
Mexico, in August, 1905, under my collection number 8101, 
and has been in cultivation since at three places. Seedlings 
have also been grown since that time to plants six feet high, 
