he 
January 30, 1907 5 
Parry’s second station noted in Bot. Cal. 1: 100, as “east of 
San Bernardino,” should be Whitewater canyon, which makes 
into the San Bernardino mountains from the Colorado desert. 
It is exclusively a desert species. 
VY MAMILLARIA ARIZONICA Engelm. in Brew. & Wats. Bot. Cal. 
1: 244. 
In characterizing this species Dr. Engelmann expressed the 
opinion that it probably would be found to extend into south- 
eastern California. Its authenticated range indicates this as 
highly probable, but as yet it has not been discovered within 
the State limits. Dr. Coulter in Cont. U. S. Nat. Herb. 3: 121, 
cites a specimen from California collected by Parish in 1880. 
This is in the Engelmann herbarium, and consists of three sep- 
atate areolae with their spines, and has a label, in Dr. Engel- 
mann’s handwriting: “Mamillaria Arizonica? deserti?”’ It cer- 
tainly came from the same plants on which Dr. Engelmann sub- 
sequently founded his 4. deserttz. Dr. Coulter very properly 
teduced both species to varieties of 14. radiosa Engelm. 
V OPUNTIA MOJAVENSIS Engelm. & Bigel.; Engelm. Proc. Am. 
Acad. 3: 293. 
This is founded, in two lines of description, on a specimen 
collected by Bigelow in 1853, ‘‘on the Mojave, west of the Colo- 
rado.” In Pac. R. R. Rep. 4: 40, this specimen is said to con- 
sist of “a few fragments, with a sterile fruit,” and plate 9, f 6-8, 
shows a “‘sterile and degenerate” frnit and two bunches of spines, 
neither fruit nor spines exhibiting any distinguishing charac- 
ters. The specimen, such as it is, is still preserved in the En- 
gelmann herbarium, at the Missouri Botanical Garden, accord- 
ing to Coulter, Cont. U. S. Nat. Herb. 3: 427. Dr. Engelmann 
himself, at a later period, appears to have regarded the species 
as of doubtful validity, for in Bot. Cal. 1: 248, he says he 
“merely indicated it, for the attention of future explorers.” In 
any case it could be identified only conjecturally, since the type 
had neither flower nor perfect fruit, and, in fact, consists of little 
