/ 
ENGELM ANN—ADD. TO CACTUS-FLORA OF U. S. 
nm 
erect pointed cotyledons, and when a few weeks old begins 
to develop its then pubescent spines. 
Var. p. with smaller tubercles in - 2 \ or LJ, or even || order, 
closely set, bearing smaller but often more numerous spines, 
(20-28 ext., 6-7 int.,) may be confounded with the simple 
mountain form of Mam. vivipara, from which, when not in 
flow er or fruit, only a close examination can distinguish it. 
is4 * P 3. Echinocactus pubispinus, spec. nov.: parvus turbina- 
tus; costis 18 subobliquis compressis interrupts; areolis 
orbiculatis; aculeis breviusculis velutinis demum nudatis 
albidis apice adustis, radialibus inferioribus lateralibusque 
5-8 brevioribus, superioribus 1-2 robustioribus rectis curva- 
tis seu hamatis, central! defieiente seu singulo robustiore 
longiore arrecto sursum hamato. 
Pleasant Valley, near Salt Lake Desert, found in May 
without flower or fruit, but exhibiting in the vestiges of the 
small supraspiral floriferous areolae the character of the genus. 
Perhaps the smallest species of the genus, 2 inches high, l-li? 
in diameter; ribs formed by compressed confluent tubercles; 
areolae 4-6 lines apart; radial spines 1-4 1. long, more 
densely pubescent, or even tomentose, than I have seen them 
in any other Cactus; on the lower areolae 5 or 6, on the upper 
ones 9-12; here and there a single central spine makes its 
appearance, 5-6 1. long, stouter, and always strongly hooked. 
Echinocactus Whipplei, Engelm. & Bigelow , Cact. 
Whipp. p. 28, t . 1 / Syn. Cact.,p. 15 / Ives ’ Exped. Bot.,p. 12. 
Var. spinosior: aculeis radialibus 9-11, inferioribus ssepe 
obscurioribus, reliquis longioribus niveis, summis 2 ssepe elon- 
gatis latioribus curvatis; centralibus 4, sumrno longo piano 
flexuoso, cseteris paulo brevioribus obscuris, solo infimo seu 
omnibus hamatis. 
Desert Valley, west of Camp Floyd, Utah, with the rem¬ 
nants of flowers and fruit, and with seeds hid between the 
spines, exactly like the seeds figured in the plate cited above ; 
embryo curved about around a large albumen ; stigmas 6-7. 
The locality is about 5 degrees north of the place where Dr. 
Big elow, and afterwards Dr. Newberry, found the plant. 
^5. Cereus viridiflorus, Engelm.; evidently the most 
northern Cereus, found as far north as the Laramie region, 
and not rare in Colorado, where it occurs 1-3 inches high, 
mostly with 13 ribs, and with the greatest variability in the 
color of the radial spines, and in the presence of the 1-2 cen¬ 
tral ones. 
:sl ^6.. Cereus Engelmanni, Parry: in the Salt Lake Desert, 
far to the northwest of the country where it was originally 
discovered; always characterized by the cruciate central 
spines. 
7. Opuntia sphjerocarpa, Eng . & Big. var.? Utahen- 
difiusa; articulis orbiculato-obovatis crassis, junioribus 
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