72 Southern California Botany. [ ZOE 
Nov., 1899. A specimen not yet in flower, and with leaves 4-7 
em. long, collected by A/cClatchie at San Pedro, May, 1896, 
probably belongs here. 
E-CHINOCACTUS CYLINDRACEUS Engelm. Pro. Am. Acad. 3.275. 
E. Wislizeni Engelm. in Brew. & Wats. Bot. Cal. 1.246, not 
Wisliz. Rep. 97. £. Wislizeni Lecontei Coulter, Contrib. U. S. 
Nat. Herb. 3.363, as to Californian plants, not Engelm. in Rothr. 
Wheeler’s Rep. 6.128. Coville, Death Val. Rep. r1o. 
The ‘‘barrel”’ or ‘“‘nail-keg cactus’”’ of the Californian deserts 
is usually referred to the variety of £. Wislizeni, while E. cylin- 
draceus has been more readily supplied by cactus-collectors than 
recognized by botanists. The type of the latter was collected in 
“rocky ravines, near San Felipe, on the eastern slope of the Cali- 
fornia Mountains, by Dr. Parry.’’* “It was originally described 
as multicipital, but it was afterwards explained that such growths 
were due probably to accidental injuries by fire to the original 
stem. It is now kept apart by certain differences in the radial 
spines. These in £. cylindraceus are said to number 1 5-17, all 
stout, the lower shorter and much hooked; while in £. Wislizeni 
Leconti there are 6-10 stout, and 12-20 slender and flexuous 
ones. But too much stress has been placed on the number of 
ribs, and the number, size, degree of curvature and color of the 
spines. ‘hese characters are of value if taken broadly, but if 
insisted upon too closely one might easily select a half-dozen 
species from the plants growing on a single hillside. Vet one 
can not be familiar with the various forms which they assume 
without being convinced that all should be included in a single 
species. 
A further distinction between the two species is found in the 
season of flowering. £. Wislizeni flowers through the entire 
season, and the type, which was collected at Dofia Ana on the 
Rio Grande River in August, showed buds, open flowers, young 
and ripe fruit on the same specimen.§ Our Californian plants 
*Engelm. Cact. Mex. Bound. 25. 
t+ Engelm. I. c. 
t Coulter, 1. c. 
4Engelm. Wisliz, Rep. 97. 
