j WEST AMERICAN SCIENTIST. ee 
frequently still persistent,.and forms an outer circle. Plant 233-4%". 
in diameter, 1-2’ high, with an almost level top and depressed vertex; in 
larget specimen 34, in smaller ones 13 or 21, spiral rows of tuberc les are 
most gas REE Radiating spines 214-6’ long, whitish; the 3 or 4 outer 
or lower are stouter and very light brown; the central spines erect, or rath- 
er somewhat inclined upwards and inwards, 2-4 (mostly 3)’ long, light 
yellowish bro e innermost tubercles of the preceding vear ape 
pear to pro aus uce fhe inconspicuous flowers, which are from 9 to long, 
Dae when not ier expanded 3 in bright sunshine. Berry 8-15/7 long. 
563, 1856; poles Nal Boundary pepe g, t. ag & Eis P 
M. ARIZONICA Engelmann, in Watson, Bot., Wheeler’s Rept. vi. 127. t 187%, 
Original description:—"The largest form, which comes from Arizona, 
I had atone time distinguished as M. Arizonica, but must now cousider it 
as only a gigantic vivipara, 3-5’ high, 4’ in diameter, with spines ofte 
over 1’ long, on rather broad and spreading tubercles. Rothrock 1 
(203), isa asco form, from Camp eee Arizona,’ fers gelmann, oe 
deeply y groo rooved, ate ng numerous seatiht, rigid tii 
or spines whitish, 3-6 interior stouter and deep br 
cS cane ‘agate 30-40, linear- subulate, fnbriate; pet 
linear, cur ; stigmas S-Io, 
scho 
cies 
; tuberéles 
‘spin S 5-1 long; flometk 2-4 ee wide, rey showy. _ ~ rng 
of California, a 1880. / 
