ECHINOCfiREUS (.sv"".'/ Corii.^]. CarU}ce<e. Stems 

 usually low and gruwiug in tUivk clusters, which yome- 

 tiiuus reach a considerably size: lis., as a rule, mostly 

 short fuunel-fonu: t.vary and tube covered with bracts, 

 from the axils of whi.-h arc- produced to a greateror less 

 extent woo], bristles and spines: I'r. globose to ellip- 

 soidal, covered with spines until ripe. The genus is so 

 closely allied to Ccreus, and merges so gradually into it, 

 that it seems impossible to draw a sharp line of dis- 

 tinction between them, and, indeed, by some authors 

 they are combined under Cereus. For culture, see 

 Cactus, Ccniis, and Kvlihiov((ctns. 



KrHixocKRErs; 



)I7 



;j. 



acit'er. 11). 

 ailustns, 'li. 

 Berlaiidit-ri, 

 Blankii, 4. 

 ca^spitosns, 21. 

 '•hlorantlnis, "jn. 

 <'hi-ysoceiitrns, i;.{. 

 coccineus, 17. 

 I'onKlomeratns, 1-1. 

 conoidens. 17. 

 ctenoides, 2!i. 

 dasyacauthus, 'S2. 



Kii 



rlui 



\'[]v 



, 1- 



KoiiJi'-iintlius, \). 

 Inii^isetiis, 10. 

 Merkeri, 8. 

 Mojavensis, IG. 

 liaucispinus, d. 



IlOctilKLtUS, 1^4. 



I.>!iu-ijici.>us, 17. 



liolyacrmthus, 18 



JJlMi'llKlllli'llS, "). 



ri^M(.hssiii(u,s, '^4. 

 Ra-tteri, 11. 

 rufispinus, 24. 

 iScheeri, 2. 

 stramiiieus, l.'i. 

 triglo'.'hidiatus^ 

 tuViPresus, 1. 

 variejijitus. i:;. 

 viviiliriorus, 21 



9. 



Sfi'his 



'<il/. 



>L murh 



embUinj 



C' n IIS. 



1. tuberosus, Riimpl. [Cvr<-ns inhiro^us, Puselg. ). 

 Stems cyliudi-ical, u[iright, ur later recliuint:. clustered, 

 from a nuuiber of more or less globular or ellipsoidal 

 tuberous roots, the lower part woody and about tlie size 

 of a lead pencil, the upper part more Heshy, about Sjin. 

 in diam.. reaching a length of 1-2 ft.: ribs about 8, 

 straight, low. rounded: areola? very close together : ra- 

 dial spines 9-1'J, horizontally spreading, straight, white, 

 thin subulate, very short ; central solitary, subulate, 

 from a tuberous base, about twice the length of the 

 radials, white or brownish, with darker brown or black 

 tips, directed upward, appressed: lis. from the end of 

 the stem, about '1 in. long, tube covered with an abun- 

 dance of white woo] intermingled with bristles, rose-red 

 to purplish: fr. ovoid, green, covered with the white 

 wool and bristles. Tex. and northern 3Xex. 



AA. StctHs jirosl rnii . soiinti iiics IJic hranrlirs uprifiht 

 u'hi-ii ijoutKj, inosihj /ess than 1 in. in diam. 



2. Scheeri, Lem. {Cereus Schctri, Salm-Dyck). 

 Branching freely from the base of the stem and forming 

 dense clusters ; branches upright or ascending, about 

 8 in. long by 1 in. in diam., slightly tapering toward the 

 apex, dark green: ribs 8-9, straight or sometimes in- 

 clined to spiral. sei>arated above by sharj) grooves, which 

 become liattened toward the base, low arched: areolepi 

 little more than ^-lin. ajiart, round, yellowish white: ra- 

 dial spines 7-0. spreading, needle-like, the under pair 

 the longest, about ^[-''siii. long, white with yellowish 

 bases; centrals 3, the lower the longest, about ^^in., 

 red with brown bases ; later all the spines become gray : 

 fi. red, from the upper part of the stem, about '^ in. 

 long: ovary and tube bracteate and furnished with 

 abundance ui wi.>ol and spines. IMex. 



;"i. Berlandieri, Lorn. i<'rr>ns B<Thinili> ri . EnLrelm.l, 

 Stems prostrate, richly branching, forming dense clus- 

 ters, the branches upright or aseending, 2-3 in. long or 

 longer by 3-j-?4 in. in diam.. lii,dit or dark green, and in 

 young growth often ])ur]dish : ribs 5-G, broken up into 

 as many straiglit ()r spiral rows of tubercles, tul)ercles 

 conical, pointed : areohe '■'■ ^-■' s i". apart, round, white- 

 woolly, soon naked : radial spines 0-8, stiff bristle-form, 

 thin, horizontally spreading, white, about ^s in. long, 

 the upper one sometimes light brown and somewhat 

 stronger ; central solitary, yellowish hrown, sometimes 

 reaching ?4 in. in length : Us. from the upper lateral 

 areolse, 2-3 in. long, red to light pink: fr. ovoid, green, 

 bristly. Southern Tex. and northern Mex. 



4. Bldnkii, Palm. (iC'rrcjrs' i??,f)i/,:;'/, Poselg.b Branch- 

 ing freely from the base and thus forming clusters: 

 stems columnar, tapering above, about 6 in. long by 

 1 in. in <liam., dark green: ribs Ty-Q (rarely 7), straight, 

 almost divided into tubercles: areolse about % in. apart, 

 round, white curly-woolly, later naked : radial spines 

 mostly 8, horizontally spreading, the under pair the 

 longest, reaching about '% in. in length, all stiff, 



straight, thin, white or the upper ones carmine-red 

 when young, later reddish brown; central solitary, por 

 rect, later deflexed, 1-1 ^ in. hnig, white or brownish, 

 black when young : tls. from nntr rlie crown, 2^2-3 in. 

 long, purple-red to violet. iMe\. iMl. 18ii5;9U. 



5. procumbeus, Lem. [Cwcus i>i-<>i-uiiihi-ns, Eugelm.). 

 Branching from the lower i)art of the strni, and so form- 

 ing clusters : branches procumbent or ascen<liiig. an- 

 gled, at the base tapering into cyliinirical, 1 ^j-.'i in. 

 long by 3^-2-/4 in. in diam.: rilis mo,sily,j, rarely 4, 

 straight or spiral, on the upper jM>rtion of the braiicli 

 almost divided into tubercles : ari'oh-e Vj-^,^, in. apart, 

 round, sparingly white cx;rly-woully. soon naked : ra- 

 dial spiTies 4-(J. subulate, stiff, straight, sharp, in young 

 growtli brownish, then white, at the hase cd'ten yellow- 

 ish and the ti]) lirowni^lj, horizonlally s]>reading, tin' 

 upper the longest, reaching ^4 in. in Icngtli ; centra! 

 solitary, or absent on the lower areohe, somewliat 

 stronger, ■'■^-■'h in. long, darker; tls. lateral, fmni jnst 

 below the crown, 3-4 in. lonu:, carmine-red to violet. 

 with white or yellowish throat: Ir. ellipsoidal, '^Vi^t:-]\, 

 •; ^ in. long. Isli^y.. 



6. enneacdnthus, Emrelm. {Cvrms < ninardnthus, 

 Eugelm. ). Freely branching at the base of the stem, and 

 thus forming thick, irregular clusters : branches as- 

 cending, xisually 3-."» in. long by 1^2-2 in. in diain., 

 green or sometimes reddish: rilis 8-](), straight, often 

 divided by transverse grooves into more or h-ss con- 

 spicuous tubercles: areola- ''.^-'^'s in. apart, round, white 

 curly-Wf'oUy, soon naked: radial spines 7-12 (mostly 81, 

 horizontally sjireading, needle- form, straight, stitf, 

 translucent white, base bnlliose. the tmder one lon^j^est, 

 reaching about '.jiii.,the upper one ^'ei-v slmrt ; central 

 solitary, or seldom with two additional tipper ones, 

 straight, porrect or deth-xed, round or angled, whitish to 

 straw-yellow or ilarker, ■',s-l'- in. hmg ; later all the 

 spines are gray : tls. lateral, from near thi' crown or 

 lower, l^--4-2 .^j in. long, re<l to ptn-plish : fr. spherical, 

 green to red, spinv, ''^-1 in. Ion;,'. Tex. and noi'thern 

 Mex. 



AAA. S(t')iis errrt, inorr than 1 in. in il ia nirf^-r. 



B. 



rrrl, , 

 L'ih> 



e/ .s/, ni 



h- 



7. diibius, Rii]tipl. ( < 'rrms ifiihiiis, Engelm. ]. Tol- 

 erably thickly clustered ; stems branching at the l>ase, 

 cylindrical or elonL;at<.-d ellipsoidal, 4b;*7 in. hii^h by 

 1^0-2^4 in. in diam.: ritis 7-9, undulate: arecda* ■'t.-':H 

 in. apart, i-ound, covered with short curly white wool, 

 later naked: radials .V8, subulate, horizontally spread- 

 ing, stiff, round or faintly angled, the lower ones 

 usually the longest, abotit 1 in. long, the upper ones 

 about half as long, or sometimes absent, transparent 

 white; centrals 1-4, stronger and longer, bulbose at the 

 base, straight or curved, reaches 2J-2 in. in length, the 

 lowest one longest, straight, yiorrect or deflexed, the 

 upper ones spreading : Hs. lateral, 2 in. long, rose-red 

 to violet: fr. spherical, greenish to pi^in-'lt'"red, covered 

 with Inindles ot deci(hious si>ines. Tex. ami noi-thern 

 Mex. 



8. Merkeri, Hihlm. Stems at first upright, columnar, 

 later reclining, and by liranching at the base formiiiLC 

 clusters, in new growth bri^dit green, later gray to gray- 

 brown and corky: ribs fi-Ii, undnhite to more or less tu- 

 berculate : areoh'e ■'4in- -'iiid )nore apart, round, white 

 velvety, later naked: radial siunes (i-9, the up]ter ones 

 the longest, reaching P4 in. in length, somewhat con- 

 fitient with the centrals, sniitilate, spreading, straight; 

 centrals 1-2, stronger, reaching a length of 2 in.: all the 

 spities are white, nearly transparent, with red-tinted 

 bulbose base. Northern ]Mex. 



9. paucispinus, Pum]il. ( C r r>' n s juiw/is/nn a.- . 

 Eugelm.). Clustered in irre.gular bunches: sti.'nisc\- 

 lindrical to ovoid, 4-7 in. high by li^''4-3 in. in <liam.:' 

 ribs 5-7, undulate : areolae %-^a in. apart, round, white 

 woolly, later naked: radial spines 3-G, spreading, subu- 

 late, straight or curved, round, bulbose at the base, the 

 lowest one longest, reaching ^i in., light colored, the 

 iipper ones reaching to about ^2 in., reddish or brown- 

 ish ; central solitary or none, reaching about 1^2 in. in 

 length, somewhat angled, bro-\i-n-black, porrect or tip- 

 right ; later all the spines blackish: tls. 2 in. or more 

 long, dark scarh-t to \-ellowish. Tex. and <_"o]o. 



