il8 



IINOCEREUS 



Var. triglochidiatus, K. 

 didtus, EriKelm. Cereii.i 

 Radial spines usually 3, si> 

 angled, base bulbosc, str: 

 long, soon ash-pray. Tex. 



Var. gonacantlius, K, 

 thus, Li-m. <:,. . 



is triglochi- 

 Engelm.). 

 IS 6, strong, 

 about 1 in. 



v-oU, oft 



>■■ IIS gonacdn- 



-I and Bigel.). 



iikI sometimes 



- iM arly 3 in. in 



.w II tips ; central 



Mattened, 3 in. or 



Radial si.in.s ,s, 



twisted, the il|i|" r i i.'iiL 



length, light or .laik wll 

 always present, ilfuply gn 

 more long. Colo. 



EB. J?ils of stem about 9-13. 



10. longis^tus, Lcm. {Crreus longisitus, Engelm.). 

 Stems clustered, cylindrical, covered with long, dirty 

 white spines, about 8 in. high by 2 in. in dianu, light 

 green: ribs 11-U. straiijlit, niidulntp: radial spines 18- 

 20, straight, coniiir.-^-.-l , l':.^.- tlii.'k..i,.<l. ^iiKnhitf. flcx- 



UOSe, usually lion.-iiiinill'. ^[-r. mIiH", ml, , I,„.|, ,,il' with 



adjacent clusters, i , , . ,i u , j,,, _. , Hash- 



ing %m. in lenr'li , i : i ■ • i ■ i <l tlio 



shortest, all Whiti- : ■■miMmI- :. 7, l^inj.r. r. ihIhhl' L"^ 



in., stronger, the uppir oni's si-arcely lunger than the 

 longest radials ; all are bulbose at tlie base ; the three 

 lower ones the longest and deflexed, spreading and 

 sometimes curved : fls. red. Mex. 



11. BtBtteri, RUrapl. (Cerens Soetteri, Engelm.). 

 Loosely open clustered: stems upright, 4-6 in. high, 2- 

 3 in. in diam., cylindrical or ovoid: ribs 10-13, straight: 

 radial spines 8-15, subulate, thickened at the base, stiff, 

 sharp, straight or slightly curved, the laterals longest, 

 about % in., the upper ones shortest, reddish with 

 darker tips ; centrals 2-5, stouter, bulbose at base, M- 

 9^ in. long, the lower ones the longest; later all the spines 

 are gray: fls. lateral, from near the crown, 2K-3 in. 

 long, porple-red to violet: fr. short ellipsoidal, spiny, 

 green, J'4in. long. Tex. to Ariz, and northern Mex. 



12. FSndleri, Rumpl. (Cereus FlndUri, Engelm.) 

 Irregularly clustered : stem cylindrical or rarely ovoid 

 or even globose, sparingly branching, 3-7 in. high by 

 'i%-2)4 inch in diam. : ribs 9-12, straight or slightly 

 spiral, undulate : radial spines 7-10, subulate, straight 

 or curved, the lowest or the two lower laterals the 

 longest, about 1 in., stronger, quadrangular, white; the 

 two next higher brownish; the upper ones round, white 

 and much shorter; all are bulbose at the base ; central 

 solitary (or in old plants 3^), very strongly thickened 

 at the base, round, black, sometimes with a lighter col- 

 ored tip, curved upward, reaching a length of \% in.: 

 lis. lateral, from near the crown, 2-3J^ In. long, dark 

 carmine-red to purple and violet: fr. ellipsoidal, spiny, 

 green to purple-red. about 1 in. long. Colo., Utah and 

 south to northern Mex. B.M. C533. 



1.3. £ngelmaniiii, Lem. (Cereus Engelmannii, 

 Parry). Stems clustered, cylindrical to ovoid, 4-10 in. 

 high, l'%-2'4 in. in diam., light green : ribs 11-13, un- 

 dulate : radial spines 11-13, somewhat angled, stiff, 

 sharp, straight or somewhat curved, horizontally spread- 

 ing, the lowest or lower laterals the longest, about J^ 

 in., the upper ones the shortest, whitish with brown 

 tips; centrals 4, stiff, straight, angled, stout, the lowest 

 one deflexed, white to dark-colored, reaching a length of 

 2Hin., the upper ones about K as long, spreading, 

 brown : fls. lateral, from. just below the crown, 1K-2K 

 in. long, purple-red : fr. ovoid, green to purple-red, 

 spiny, later naked, about 1 in. in diam.; pulp purple- 

 red. Calif, to Utah and south into Mex. 



Var. chrysocfintrus, Engelm. and Bigel. The three 

 upper centrals golden yellow, the lowest" white. Moiave 

 desert, Calif. 



Var. variegitus, Engelm. and Bigel. The three up- 

 per centrals curved, horn-colored and mottled with 

 black. Utah, Nev. and Calif. 



14. conglomeritus, Forst. Stems clustered, colum- 

 nar, B jmewhat tapering above, reaching a height of 1 ft. 

 and 2 in. in diam., light green: ribs 12-13, strongly un- 

 dulate, tubercled above: radial spines fl-in, trlnssy, 

 spreading, the lower pair the l.m^'.st. liaM' vi-llo\v: cen- 

 trals 1-4, the lowest straii;lit. pinirrt. r.-a. lini;.- a lintcth 

 of IV2 in. and more, soiuewliat vi n.i,-, r tlian tin- rest. 

 Northern Mex. 



ECHIKOCEREUS 



15. BtramineuB, Riimpl. (Cereiis stranitiieus, Engel- 

 mannl. Clustered in thick, irregular bunches : stems 

 ovoid to cylindrical, 4-8 in. long, lii-2'A in. in diam.: ribs 

 11-13: radial spines 7-10 (usually 8), horizontally radi- 

 ate, straight or slightly curved, subulate, sharp, round 

 or the long lower ones angled, transparent white, toler- 

 ably equal in length, about i4-% in. or the lower ones 

 sometimes longer and reaching a length of 1% in.; cen- 

 trals 3-4, much longer, stronger, twisted, angled, straw 



■4* f> -? .*f 



■% 



f 



yellow to brownish, when young reddish transparent, 

 the upper ones shortest and spreading upward, the 

 lower ones porrect or depressed : fls. lateral, 2}^-3J^ in. 

 long, bright purple-red or deep dark red to scarlet: fr. 

 ellipsoidal, about IK in. long, covered with numerous 

 spines, purple-red. Tex. to Ariz, and northern Mex. 



16. MojaTinsis, RUrapl. {Cereus Mojav(nsls, Engelm. 

 and Bigel.). Stems clustered, ovoid, reaching 3 in. in 

 height by 2 in. in diam.: ribs 8-12, conspicuously undu- 

 late : radial spines 5-8, the lowest pair the longest, 

 reaching about 2!^ in. in length ; all are white with 

 brown tips, subulate, straight or curved, strongly bul- 

 bose at the base; central solitary, or sometimes absent, 

 stronger and somewhat longer and darker colored; 

 later all the .spines become gray: fls. 2-3 in. long, deep 

 carmine: fr. ellipsoidal, about 1 in. long. Mojave des- 

 ert of Ariz., Nev. and C.-ilif. 



17. phceniceus, I.i m 

 Engelm. Cereus plf: . 

 larly clustered, ellip^^ 

 high by 1K-2M in. 

 spines bristle-form, sti 

 K-K in. long, upper 

 stouter, white to yello' 



;!«< 



r 1.1. Stems irregu- 



ylindrical, 2-4 in. 

 ill, nl.s 8-11, Straight: 

 ., louii.l. ludials 8-12, white, 

 ;s shortest ; centrals 1-4, 

 brown, with bulbose base: 

 fls. from upper lateral areolae scarlet-red, with the co- 

 rolla throat yellow. Colo, to Ariz. 



