30 MISSOURI BOTANICAL GARDEN. 
twisted, often curved in various ways, but more often erect-spreading, 
commonly about 4, the longest often 4 to 5m. long, but mostly 2 to 
3 cm., not annular; flowers yellow, the outer sepals always tinged 
with red and often a blush on the outer ribs of inner perianth seg- 
ments, always red when closed and greenish red in bud, filaments 
greenish below and lighter above, style red, stigma green, 6-7 parted, 
ovary broadly obovate to hemispherical; fruit subglobose to obovate, 
red. 
The species of the region have been much studied and are 
very difficult of segregation. Opuntia occidentalis and O. 
littoralis are generally accepted, although possibly not always 
correctly interpreted. It appears to me that the best treat- 
ment of the species of the immediate vicinity will recognize 
four, one of which is still undescribed and usually referred to 
O. occidentalis. This, of course, does not include the intro- 
duced forms, clumps of which may occasionally be found 
growing as though wild. 
Like so many species of the group, this one is exceedingly 
variable, but only remotely related to the other species of 
the region. Its difference in habit alone is sufficient to separ- 
ate it from either Opuntia occidentalis or Opuntia littoralis 
with which it grows. 
The description is taken in the main from the type, supple- 
mented from previous notes in or near the type locality. The 
type specimen was collected east of San Diego, California, 
April 2, 1909, under my collection number 9647. In pre- 
vious years, several other numbers of the same thing have 
been collected in the same locality. It extends back some 
distance from the coast, from Santa Barbara south. Pre- 
vious collections show a great variability in size of joints 
and character of spines.—Plate 8. 
Opuntia cyanella, sp. nov. 
Plant comparatively compactly branched, spreading with main 
_stems on edge on ground or when vigorous often flat, usually more or 
less hemispherical; joints large, wavy, seldom flat, commonly pointed 
at both ends to some extent, commonly 32 40 cm., margin more 
or less irregular on account of the prominent areoles, light blue- 
glaucous-green, but glossy bright green when young and becoming 
scurfy brown in age; areoles very large and prominent, somewhat 
