ENGELMANN — ADD. TO CACTUS-FLORA OF U. S. 199 



erect pointed cotyledons, and when a few weeks old begins 

 to develop its thru pubescent spines. 



Var. jl. with smaller tubercles in 2 8 T or i|, or even %\ order, 

 closely set, bearing smaller but often more numerous spines, 

 (20-2*8 ext., 6-7 int.,) may be confounded with the simple 

 mountain form of Mam. vivipara, from which, when not in 

 flower or fruit, only a close examination can distinguish it. 



3. Echinocactus pubispinus, spec. nov. : parvus turbina- 

 tes; costis 13 subobliquis compressis interruptis; areolis 

 Orbicularis; aculeis breviusculis velutinis demura nudatis 

 albidis apice adustis, radialibus inferioribus lateralibusque 

 5-8 brevioribus, superioribus 1-2 robustioribus rectis curva- 

 tis sen hamatis, centrali deficiente 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, 1-H 

 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. 



4. Echinocactus Whepplbi, Engelm. & JBigeloio, Cact. 

 Whipp.p. 28, t. 1 ; Syn. Cact.,]). 15 y Ives 1 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, summo longo piano 

 flexuoso, cseteris paulo brevioribus obscuris, solo intimo 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 2 around a large albumen ; stigmas 6-7. 

 The locality is about 5 degrees north of the place where Dr. 

 Bigelow, 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. 



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 sphverocarpa, Eng. & Big. var. V Utahen- 

 sis: diffusa; articulis orbiculato-obovatis crassis, junioribus 



