282 CEREUS 



ing slender, parallel with the main stem : ribs 12-16, 

 rounded: areolae close together, brown ; spines tine, slen- 

 der, very sharp, 15-20, fascicled, white to yellow or darli 

 brown, about i4 in. long ; sometimes a single one from the 

 center reaches a length of % in. : fls. numerous, tubular, 

 zygomorphous, 2K-3 in. long by about Kin. in diame- 

 ter throughout, red or sometimes with orange-red petals 

 and red tube. Uruguay, Paraguay and Argentine Re- 

 public. 



28. iabgonua, K.Seli. Stem upright, columnar, about 

 1-lK in. indiam., in young growth light green to yellow- 

 green, later darker ; ribs 15-16 : areolae approximate, 

 white, turning gray: radial spines as many as 20, 

 spreading, at first clear or darlc yellow, becoming white, 

 and finally gray, bristle form, flexible, about %in. long; 

 centrals 6-8; two of these are somewhat stronger and 

 stiffer, about % in. long, one directed upward and one 

 downward, yellowish brown to dark honey-color ; later 

 gray, as in the radials. S. Amer. 



29. spl^ndens, Salm-Dyck. Columnar, slender, short, 

 rigid, more or less branching from the base, reaching a 

 height of about 2 ft. and about 1-lKin. in diam., light 

 to yellowish green : ribs about 10-12, rouiiib'd ; areolae 

 prominent, about Ji in. apart, tawin , lH,,.ii,iif- wliite. 

 tomentose : radial spines 8-12. ii! • i .\\ and 



light brown, becoming gray; • ! nci-ly 



larger than the radial, yellowisli I" :\\^>\' ]<■ -pines 



slender, bristle form, about ^-.'4 m- lui.s;- -I In- may 

 be but a lower, stouter form of C. rcpandus. C. Caven- 

 dishii has been referred to this species, but with some 

 question. 



BB. Bibs S-10. 



30. repflndus, Haw. (C. eridphorus, Pfeiff.). Stem 

 simple, 20 ft. high, tapering at summit and jointed, 

 with 8-10 obtuse ribs: spines 9-12, needle-,shaped, white 

 with black tips : large white, funnel form flowers, the 

 calyx-tube covered with long wool. W. Indies. 



31. plat^gonus, Otto. At first upright, later some- 

 what reclining, branching, at the base about 1 in. in 

 (liam,. tapi-ririL- in th<- new growth: ribs 8, low, archedi 

 ■ii'cii. ,,Im,,,, I, ,,, ,;,:irt.very small, yellow, becoming 

 i-'i.i,. I- ! ,1 small 3-angled bract; radial 

 -I'll" - IJ r. I 'iL.'. bristle form, little more than 

 's ill. I"ii4: '.lit 111 iMiary, slightly longer and stronger; 

 all till- si.in.s at first yellow-brown, changing to white 

 or gray with age. 



32. C8erul6scen8, Salm-Dyck (O. Ldndbeekl, Phil.). 

 Arborescent or shrubby, 3-5 ft. high: stems 1-1 V2 in. in 

 diam.: ribs usually 8, obtuse: areolffi approximate, white 

 bud soon becoming black : spines rigid ; radials 9-12, 

 H-i4 in. long, black ; centrals 4, % in. long, stronger, 

 black or white : fls. from the si3e of the stem, slightly 

 curved, 6-8 in. long by 6 in. in diam., tube bronze-green, 

 corolla white or occasionally rose-pink: frs. ellipsoidal, 

 pointed at both ends, about 3 in. long and half that in 

 diam., bright red, with blue glaucous covering. Argen- 

 tine Republic. B.M. 3022. 



33. Bridgesii, Salin Dyck. Upright, tall, columnar, 

 simple in- lattr l.iaiHhiii!; at the base, bright green when 

 young, be.-uimiii,' l.hir to gray-green, lK-2 in. in diam.: 

 ribs 5-7, very Itrojul and low : areola ^-^in. apart, 

 yellowish to gray: spines 3-5, radiating, the under one, 

 or seldom the upper one, the longest, i% in. long, stiff, 

 sharp, straight, dark honey-yellow, with brown tips, be- 

 coming gray with age. Bolivia. 



Var. lagenifdrmis, K. Sch. ( C lagenifdrmis, Forst.). 

 Spines more numerous, somewhat longer, 



34. azCireuB, Parm.(C.Se)dehi, Lehm.). Stem upright, 

 tall, slender, columnar, branching from the base, in the 

 young, fresh bluish green, later dark green with gray, 

 glaucous covering, about 3-4 ft. high and about 1 in. in 

 diam. : ribs 5-7, rounded, enlarged at the areolae : 

 areolffi about %-l ft. apart, elevated, large, abundantly 

 woolly when young : spines 8-18, nearly alike, about 

 %-ya in. long, stiff, slender, needle-form to bristle-like, 

 black; the 2-4 central ones somewhat longer: fls. 8-12 

 in. long, obliquely attached to the stem, slightly curved, 

 white. Braz. 



35. CEBsius, Otto. Upright, columnar, branching at the 

 base, somewhat tapering above; in new growth, beauti- 



CEREUS 



ful light blue, pruinose ; later, light green to slightly 

 bluish, about l>^in. in diam.: riijs 5-6, separated by 

 sharp grooves, about % in. high, compressed, faintly 

 crenate, becoming depressed in older growth : areolae 

 about % in. apart, small, yellow at first, later becoming 

 white and finally gray : radial spines 8-10, sometimes 

 more appear later; radiate, litrht ambfr-rolnr, brown at 

 the base, the lower pair the lunLiPst. iri'tstiv about J^ in. 

 long; centrals 4-7, like the railiaK l.nt usually some- 

 what stronger, longer and ilaik-i- ; all tlit- .spines thin, 

 needle-form, flexible, sharp ; latt-r, liyht horn-color, 

 finally gray. S. Amer. { '.}. 



36. Greggii, Engelm. Slender and branching, 2-3 tt. 

 high and %-l in. in diam., from an extraordinarily 

 large, tuberous root (often 6-10 in. long and 4-6 in. in 

 diam.): ribs ,;-i;. a.nt.- : s))ines subulate from bulbous 

 base, very si,., it an. I -harp, 7-11, 1 or 2 being central: 

 fls. white or V. llo\vi.|i. i;-.s in. long; fr. ovate, alternate 

 at base ami apex. I.riu'ht scarlet, fleshy and edible, 1-2 

 in. long. Southwestern Tex. to Ariz., and south into 

 Chihuahua and Sonora. Generally in gravelly or hard, 

 clayey soil. 



37. specidBUS, K. Srh. (C. rorrhims, Salm-Dyck. 0. 

 Schrdnkii, ZunQ. c . /'-'" .■^ '"././(.■,■, DC). Slender, 

 much branched from , i '. ■:,-,•; stems about 2 ft. 

 iQ length by about 1 . . 1 .: . sometimes having 

 aerial roots near tl.i ,. un- -f-v,ili: ribs 3-5, serrated: 

 areolae occupy the .sli..ii uppn side of the serrations, 

 large, copiously white, woolly ; spines fascicled, 5-8, 

 more in age, spreading, slender, stiff, sharp-pointed, the 

 under one bristle-form, about K in. long, yellow : fls. 

 appearing from the older growth of the stems ; large, 

 6 in. in diam., remaining open several days, purple-red, 

 with irridescent, bluish center : fr. ovoid, with a few 

 scattering scales, lK-2 in. long. Mex. and Cent. .\mer. 

 B.M. 3822. I.H. 32:548. Gn. 53, p. 153.-This species is 

 commonly hybridized with other species of Cereus and 

 of Phyllocactus, giving rise to numerous horticultural 



38. Mexic&nus, Lem. Said by Lemaire to be a garden 

 hybrid between C. speciosiis and some other species not 

 mentioned. 



AAA. Stems prostrate. 



39. £mOTyi, Engelm. Prostrate, cylindrical, 2-4 ft. 

 long, with ascending or erect branches 6-10 in. high and 

 1-2 in. in diam.: ribs 15, tuberculate : spines slender 

 and rigid, interlocked, yellow ; radials 40-50, very slen- 

 der; central usually solitarj', stouter and much larger : 

 fls. greenish yellow, 1-2 in. broad : fr. globose, very 

 spiny, 1-1 J^ in. in diam. Rocky hills, S. Calif, into L. 

 Calif, and adjacent islands.— Grows in thick masses, 

 covering patches 10-20 tt. square. 



40. gummbeus, Engelm. (f. giimmindsus , Hort.). 

 Prostrate and assurgent, 1-1 ft. long, 3-4 in. in diam.. 

 dull purplish green: ribs (on young branch) 7-a, tiilier- 

 culate: spines stout and rigid, black, from a strong, 

 bulbous base; radials about 12; centrals 3-6, stout and 

 angled: fls. purple, 4-5 in. long: fl. subglobose. about 3 

 in. in diam., spiny, bright scarlet with purple pulp 

 ("color of ripe watermelon"), acid and pleasant. L. 

 California. 



41. eiiica, Braudegee. Prostrate and stout, .suigle or 

 slightly branched, 2-t ft. long, 3-7 in. in diam.. rooting 

 from the under surface, generally in patches of 20-30 : 

 ribs 13-21: spines stout, ashy, interlocked; centrals ,5-8, 

 stouter, the lowest flattened and strongly deflexed : fls. 

 4-5 in. long, reported to be yellow: fr. globular, 2 in. in 

 diam., somewhat spiny, dull red, with purple pulp. Sandy 

 plains, coasts of L. Calif, and adjacent islands. — A plant 

 of curious and uncouth habit, often in large masses, and 

 from a distance " looking like a lot of firewood thrown at 

 random on the ground." 



42. Fitaid,ya, DC. (C. Pernambiicinsis [Fernambu- 

 censis], Lem. C. formdsus, Salm-Dyck. C. variibilis, 

 Pfeiff. ) . Stems at first simple, later branching, in young 

 growth light green, turning grayish green with age, 

 pointed, 5i-lKin. indiam.: ribs 3-5, commonly 4: areolw 

 about 1 in. apart, large, bearing a conspicuous' amount of 



