1094 



ECHINOCEREUS 



gray and corky with age: ribs 9-11, usually 10: radial 

 spines usually 9, spreading, under pair longest, about 

 }^in., in young growth white, later horn-colored to 

 gray, the upper ones brownish; central solitary, straight, 

 porrect, at first ruby-red, later brown, 1 in. long: fls. 

 lateral, 2 in. and more long, clear scarlet-red, with a 

 yellow throat and sometimes a carmine border. N. 

 Mex. 



FP. Central spines 1-4: sis. 2-4 in. high. New Mex. 

 and Colo. 



10. coccineus, Engelm. (E. phoeniceus, Lem. Cereus 

 phoeniceus, Engelm.). Sts. irregularly clustered, ellip- 

 soidal to short-cylindrical, 2-4 in. high by l^z-2^ 

 in. diam.: ribs 8-11, straight: spines bristle-form, 

 straight, round; radials 8-12, white, %-/4 m - long? 

 upper ones shortest; centrals 1-4, stouter, white to 

 yellow or brown, with bulbose base: fls. from upper 

 lateral areoles scarlet-red, with the corolla-throat 

 yellow. Colo, to Ariz. 



Var. conoid e us, Engelm. (E. conoideus, Rumpl- 

 Cereus conoideus, Engelm.). Central spine long and 

 robust: fls. large, red. S. Calif, and N. W. Mex. 



cc. Fls. never scarlet, usually crimson or purplish, 



sometimes yellow. 



D. Spines more or less pectinate: ribs 12 or more. 



E. Areoles short, nearly orbicular. 



F. Color of spines while. 



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

 Sts. clustered, cylindrical, covered with long, dirty 

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

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

 18-20, straight, compressed, base thickened, subulate, 

 flexuose, usually horizontally spreading, interlocking 

 with adjacent clusters, the lower laterals the longest, 



reaching JHiin. long, 

 the upper more bristle- 

 like and the. shortest, 

 all white; centrals 5-7, 

 longer, reaching 2J^ 

 in., stronger, the upper 

 ones scarcely longer 

 than the longest ra- 

 dials; all are bulbose 

 at the base; the 3 lower 

 ones the longest and 

 deflexed, spreading and 

 sometimes curved: fls. 

 red. Mex. 



FF. Color of spines white 



and brown. 

 12. chloranthus, 

 Rumpl. (Cereus chlor- 

 anthus, Engelm.) Fig. 

 1375. Sts. in small 

 clusters, cylindrical, 

 slightly tapering above, 

 4-9 in. high by 2-2^ 

 -.;. in. diam.: ribs 13-18, 

 ?*=T straight or rarely 

 $"'- spiral: radial spines 

 ' 12-20, horizontally 



1375. Echinocereus chloranthus. spreading and ap- 



pressed, sharp, the 



shortest one about jHjin. long and white, the lower 

 laterals a little longer and have purple tips; centrals 

 3-5, or in young plants absent, bulbose at the base, 

 the upper ones shortest, about the length of the radials, 

 and darker colored, with purplish tips, the lower ones 

 stouter, about 1 in. long, deflexed, white; frequently all 

 the spines are white: fls. lateral, little more than 1 in. 

 long; ovary and tube white bristly; petals green: fr. 

 ellipsoidal, about Min. long, spiny. Texas and New 

 Mex. 



EE. Areoles more or less elongated. 



F. Color of fls. greenish or yellow. 



G. Fls. greenish. 



13. viridifldrus, Engelm. (Cereus viridiflorus, 

 Engelm.). Sts. solitary or only in age forming small, 

 loose clusters, cylindrical or elongated, ellipsoidal, 3-7 

 in. high by 1-2 in. diam: ribs 13: radial spines 12-18, 

 horizontally radiate, pectinate, straight or somewhat 

 curved, subulate, the lower laterals the longest, about 

 3^in., translucent ruby-red, the others white; centrals 

 usually absent, rarely 1, strong, about %in. long, 

 curved upward, red with brown point: fls. lateral, 

 from just below the crown, broad funnelform, little 

 more than 1 in. long; ovary and tube spiny; corolla 

 green, with a broad darker olive-green to pink stripe 

 down the middle of each petal: fr. ellipsoidal, about 

 Hin. long, greenish. Wyo. and Kans. to Texas and 

 New Mex. 



GG. Fls. yellow. 



H. Ribs 15-21: central spines unequal. 



14. dasyacanthus, Engelm. (Cereus dasy acanthus, 

 Engelm.). Sts. solitary or sometimes forming open 

 clusters, ellipsoidal to short-cylindrical ribs 15-21, 

 straight or sometimes slightly spiral, obtuse: radial 

 spines 20-30, straight or sometimes slightly curved, 

 subulate, stiff, sharp, pectinate, white with red or 

 brown tips, later gray, the laterals longest, 3^-1 in., the 

 upper ones shortest, about %in., those of one cluster 

 interlocking with those of the adjacent clusters; cen- 

 trals 3-8, the lower one longest, white with colored tips, 

 mostly with bulbose bases: fls. from near the crown of 

 the st. large, 23^-3 in. long; ovary and short tube 

 covered with white, reddish tipped stiff bristles; 

 corolla yellow: fr. 1-1 ^ in. long, ellipsoidal, spiny, 

 green to reddish. Texas. 



HH. Ribs 15 or 16: central spines very short, equal. 



15. ctenoides, Lem. (Cereus ctenmdes, Engelm.). 

 Sts. solitary or rarely branching, cylindrical to elon- 

 gated ovoid, reaching a height of 6 in. and a diam. of 

 2^2 in.: "bs 15-16, usually straight: radial spines 13- 

 22, horizontally radiate, pectinate, subulate, bases 

 bulbose and laterally compressed, stiff, straight or 

 often slightly curved, the laterals longest and about 

 %in., the upper ones very short, white or sometimes 

 with brownish tips; centrals 2-3 or rarely 4, superposed, 

 coarser, bulbose at the base, short and conical to J^in. 

 long, reddish; later all the spines are gray: fls. lateral, 

 from near the crown, 2 2^-3 in. long; ovary and short 

 tube white bristly; corolla yellow, with greenish 

 throat. Texas, and N. Mex.-This species is very rare 

 in cult. 



FF. Color of fls. purple. 



G. The spines irregularly pectinate. 



16. Rdetteri, Rumpl. (Cereus Rdetteri, Engelm.). 

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

 3 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, 

 %-*/&&. long, the lower ones the longest; later all the 

 spines are gray: fls. lateral, from near the crown, 23-^-3 

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

 green, %in. long. Texas to Ariz, and N. Mex. 



GG. The spines regularly pectinate. 



H. Tube of fl. and spines of ovary slender and weak, the 

 surrounding hairs long and cobwebby. 



17. caespitosus, K. Sch. (Cereus casspitdsus, Engelm.). 

 Radials 20-30, curved, clear white or with rose-red 

 tips; centrals absent, or 1-2 very short ones. Okla., 

 Texas and Mex. 



