518 



ECHINOCEREUS 



Var. triglochidiatus, K. Sch. ( Echinocereus tnglochi- 

 dicltus, Engelm. Cereus triglochididtus, Engelm.). 

 Radial spines usually 3, sometimes as many as 6, strong, 

 angled, base bulbose, straight or curved, about 1 in. 

 long, soon ash-gray. Tex. and New Mex. 



Var. gonacanthus, K. Sch. (Echinocereus gonacdn- 

 thus, Lem. Cereus gonacdnthus, Engelm. and Bigel.). 

 Radial spines 8, very large, angled and sometimes 

 twisted, the upper strongest, reaching nearly 3 in. 11 

 length, light or dark yellow with brown tips ; central 

 always present, deeply grooved, often flattened, 3 m. or 

 more long. Colo. 



BB. fiibs of stem about 9-13. 



10. longisetus, Lem. (Cereus longisetus, Engelm.). 

 Stems clustered, cylindrical, covered with long, dirty 

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

 green: ribs 11-14, straight, undulate : radial spines 18- 

 20, straight, compressed, base thickened, subulate, flex- 

 uose, usually horizontally spreading, interlocking with 

 adjacent clusters, the lower laterals the longest, reach- 

 ing %'m. in length, the upper more bristle-like and the 

 shortest, all white ; centrals 5-7, longer, reaching 2% 

 in., stronger, the upper ones scarcely longer than the 

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

 lower ones the longest and deflexed, spreading and 

 sometimes curved: fls. red. Mex. 



11. Eoetteri, Riimpl. (Cereus Rcetterl, 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 Y* in., the upper ones shortest, reddish with 

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

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

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

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

 green, %in. long. Tex. to Ariz, and northern Mex. 



12. F6ndleri, Riimpl. (Cereus Fendleri, Engelm.) 

 Irregularly clustered : stem cylindrical or rarely ovoid 

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

 l%-2% 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 34), very strongly thickened 

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

 ored tip, curved upward, reaching a length of 1% in. : 

 fls. lateral, from near the crown, 2-334 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. 6533. 



13. fingelmannii, Lem. (Cereus Engelmannii, 

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

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

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

 sharp, straight or some what curved, horizontally spread- 

 ing, the lowest or lower laterals the longest, about % 

 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 

 2 Kin., the upper ones about % as long, spreading, 

 brown : fls. lateral, from just below the crown, l%-2% 

 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. chrysoc6ntrus, Engelm. and Bigel. The three 

 upper centrals golden yellow, the lowest white. Moiave 

 desert, Calif. 



Var. variegatus. Engelm. and Bigel. The three up- 

 per centrals curved, horn-colored and mottled with 

 black. Utah, Nev. and Calif. 



14. conglomerate, Forst. Stems clustered, colum- 

 nar, somewhat tapering above, reaching a height of 1 ft 

 and 2 171. in diam., light green: ribs 12-13, strongly un- 

 dulate, tubercled above : radial spines 9-10, glossy 

 spreading, the lower pair the longest, base yellow; cen- 

 trals 1-4, the lowest straight, porrect, reaching a length 

 of l/ in. and more, somewhat stronger than the rest 

 Northern MPX. 



ECHINOCEREUS 



15 stramineus, Riimpl. (Cereus stramineus, Engel- 

 mann). Clustered in thick, irregular bunches : stems 

 ovoid to cylindrical, 4-8 in. long, 1%-2K 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 >-% in. or the lower ones 

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

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



747. Echinocereus chloranthus. 



yellow to brownish, when young reddish transparent, 

 the upper ones shortest and spreading upward, the 

 lower ones porrect or depressed : fls. lateral, 2%-3% in. 

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

 ellipsoidal, about 1% in. long, covered with numerous 

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



16. Mojavensis, Rumpl. (Cereus Mojavensis, 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 Calif. 



17. phoenfceus, Lem. (EcTiinocereus coccineus, 

 Engelm. Cereus phoeniceus, Engelm.). Stems irregu- 

 larly clustered, ellipsoidal to short cylindrical, 2-4 in. 

 high by l%-2% in. in diam.: ribs 8-11, straight: 

 spines bristle-form, straight, round; radials 8-12, white, 

 %-% in. long, upper ones shortest ; centrals 1-4, 

 stouter, white to yellow or brown, with bulbose base: 

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

 rolla throat yellow. Colo, to Ariz. 



