282 



CKREUS 



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

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

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

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

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

 zygomorphous, 2}^-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. is6gonu3, K.Seh. Stem upright. fMinmnnr, n'mnt 



l-n-4 in. indiam., in young growth liL'li' - ■ "'W- 



grecu, later darker : ribs 15-16: ar. - ■ iir. 



white, turning gray: radial spinis , Jo, 



spreading, at first <.'lt'ar (»r dark yeHo\' i . ^ wlitif.-, 



and finally gray, bri-i I' i -i m , il. - :i..^ - ,: ^ in. long; 



centrals 6-8; two .ii i imnger and 



stifter, about % ill. I i 1,m ;ir<l and one 



downward, yellowi-li iirn-.n i-. (l:iik Iimi,, \ i-olor ; later 

 gray, as in the radials, S. Aim-r. 



29. spl6ndens, Salm-Dyck. Columnar, slender, short, 

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

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

 to yellowish green : ribs aboui In :_'. r.ruiMl.il : areolce 

 prominent, about ^in.ai.aii. :,i ■ 1h r.ming white, 

 tomentose : radial spines s i ' i i , i i., yi-llow and 

 light brown, becoming gra> , r.iiiin, i-:(, scarcely 

 larger than the radial, yellowi^li ui »liitt.s all the spines 

 slender, bristle form, about /4-/4 in. long. — This may 

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

 dishii has been referred to this species, but with some 

 question. 



BB. Bibs S-10. 



30. rep&ndus, Haw. {C. erUphoriis, 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. plattgonuB, Otto. At first upright, later some- 

 what reclining, branrliinu:, at the baso abrmt ] in. in 

 diam., tapering in thr inv,- ^-n.wlh : rili^ s, I.iw, arrli,.,!; 



gray, subtruded \i\ a Muall ;:-aii;:U'<l hiaci ; radial 



% in. long; central solitary, slightly longerand stronger; 

 all the spines at first yellow-brown, changing to white 

 or gray with age. 



32. caeruUscenB, Salm-Dyck (C. Zdndbecki, Phil.). 

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

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

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

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

 black or white : fls. from the side 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. 3922. 



33. Bridgesii, Salm-Dyck. Upright, tall, columnar, 

 simple or later branching at the base, bright green when 

 youim-. bcc'i>iiiing bliu' tn gray-gre™, lH-2 in. in diam.: 

 ril>-i r,-7. viiy lin..i(l and !,,«■ : arnolre %-%m. apart, 

 yidlnwish !.• :;i'ay: spinrs :;-,",, radiating, the under one, 

 ors.ddnni tin' upper nnr. tln> lon-c-sf, IK in. long, stiff, 

 sharp, strais;lit, dark honey ytllow, with brown tips, be- 

 coming gray with age. Bolivia. 



Var. Iagenif6rmis, K. Sch. (C. lagenitdrmis, Forst.). 

 Spines more numerous, somewhat longer. 



34. azilreus, Parni I c'..^'. '■','. ■.■.', l,<Iini,i. si,iii npri-Iit, 



tall, slender, cohnnn;.' : I i r-.i ■'.: i, . ilm 



young, fresh blui^li . . , i :ty. 



black; tlic . 

 in. long, obi 

 white. Bra; 



I. large, abundantly 

 ni-,irly alike, about 

 nrm to bristle-like, 

 lat longer : fls. 8-12 

 em, slightly curved, 



CEREUS 



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

 bluish, about IK in. in diam.: ribs 5-6, separated by 

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

 crenate, becoming depressed in older growth : areolse 

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

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

 more appear later; radiate, light amber-color, brown at 

 the base, the lower pair the longest, mostly about K in. 

 long ; centrals 4-7, like the radials but usually some- 

 what stronger, longer and darker ; all the spines thin, 

 needle-form, flexible, sharp ; later, light horn-color, 

 finally gray. S. Amer. ( !). 



36. Gr^ggii, Engelra. Slender and branching, 2-3 tt. 

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

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

 diam.): ribs 3-6, acute : spines subulate from bulbous 

 base, very short and sharp, 7-11, 1 or 2 being central: 

 fls. white or yellowish, 6-8 in. long; fr. ovate, alternate 

 at base and apex, bright 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. specidsus, K. Sch. {C. cocclneus, Salm-Dyck. C. 

 Schrdnkii, Zucc. C. specioslssimus, DC). Slender, 

 much branched from toward the base; stems about 2 ft. 

 in length by about 1 in. in diam., sometimes having 

 aerial roots near the young growth: ribs 3-5, serrated: 

 areolae occupy the short upper 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 '.. in. long, yellow : fls. 

 appearing from the old. r -r.'.- mi "i iln- stems ; large, 

 6 in. in diam., remainini days, purple-red, 



with irridescent, blui^li ...id, with a few 



scattering scales, 1K-- in. I n- . -M' \. and Cent. Amer. 

 B.M. 3822. I.H. .32:548. (in. .-,.!. p. l.-,3.-This species is 

 commonly hybridized with other species of Cereus and 

 of Phyllocactus, giving rise to numerous horticultural 

 varieties. 



38. Mexioinug, Lem. Said by Lemaire to be a garden 

 hybrid between C. speciosus and some other species not 

 mentioned. 



AAA. Stems prostrate, 



39. fimoryi, 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 snlitary, .stnnter and much larger : 

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

 spiny, 1-lKin. in diam. l;.lek^ lull.. S. Calif, into L. 

 Calif, and ad.jacent islands. -( iri.w.s in thick masses, 

 covering: patches 10-20 ft. s.pi.ire. 



40. gummosus. En-elm. i r. iiinnminbsus, Hort.). 

 Prostrate and assur^ent, 1-4 ft. Iniiir. 'A-i in. in diam., 

 dull pnrplisli 1,'reen: ribs |nn ymim; branch) 7-9, tuber- 

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

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

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

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

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

 California. 



41. ertica, Brandegee. Prostrate and stout, single or 

 slightlv branched, 2^ ft. long. 3-7 in. in diam., rooting 

 from tiie nmier surface. L'em-rallv in patches of 20-.30 : 



ribs i:; 'I : - [ - ("ni . ,i -bv . i- 1. .eked; centrals 5-8, 



stoiitr- Ik. I ' , .i .en! M...,-lvdeflexed: fls. 



4-5 in. k. '. I I ■ ' I : , -inbular, 2 in. in 



diairi,. - A kill i ,, -lull r. d. w Ilk purple pulp. Sandy 



plains, oasts of I,. Calif, tind adjaeent 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." 



AAAA. Stems weak, clamberinq over rocks or other plants 

 for support; without aerial roots. 



42. Pitajaya, DC. (C. Pernamhiir^nsis \Femambu- 

 censis], Lem. C. formbsus, Salm-Dv, 1<. r i;fridl,ilis, 



Pfeiff.). Stems at first simple, bit. i ki. kue-, ui young 



growth light green, turning u'im ub age, 



pointed, %-lHin. in diam.: ribs:; i ..ireolse 



about 1 in. apart, large, bearing a e..n.|.i,u.Mis amount of 



