ECHINOCACTUS 



23. Echidne, DC. {£■. f^andeiwyi, Lem.). Depressed- 

 globose, 5-7 in. in diam., 3— 1 in. higli: ribs 13, acute: 

 radial spines 7, broad, rigid, spreading, yellowish, 1 in. 

 or more long; central spine solitary and scarcely longer 

 than the others: flowers bright yellow, 1 in. or more 

 long. Mexico. 



24. Tez^nsis, Hopf. Mostly depressed (sometimes 

 globose 1 , 8-12 in. in diam., 4-6 in. high, simple: ribs 

 mostly 21 (sometimes 27, and in smaller specimens 13 

 or 14) and undulate: spines stout and fasciculate, red- 

 dish, compressed; the exterior 6 or 7 radiant, straight- 

 ish or curved, unequal, K to four-flfths in. long in some 

 cases, one and one-fifth to 2 in. in others, much shorter 

 than the solitary and stout recurved central, which is 

 sometimes one-sixth to H in. broad: flowers about one- 

 lifth in. long, parti-colored (scarlet and orange below 

 to white above). Texas and northeastern Mexico. 



25. £moryi, Engelm., var. rectisplnus, Engelm. Fig. 

 745. Globose, at length cylindrical: ribs 13-21, obtuse 

 and strongly tuberculate : radial spines 7-9, very unequal, 

 the 3 upper ones 4-5 in. long, the lower lK-3 in. long 

 and paler; the central very long (12-13 in.), straight or 

 slightly decurved. Southwestern United States and 

 northern Mexico. 



2G. reciimis, Link & Otto. Subglobose and very stout: 

 ribs about 15, covered with broad, dark red spines, the 

 radials spreading, the central one recurved and very 

 stout. Mexico (?). 



27. setisplnus, Engelm. Subglobose, 2 to three and 

 one-fifth in. in diam.: ribs 13, more or less oblique, 

 often undulate or somewhat interrupted: radial spines 

 14-16, setiform and flexible, two-fifths to four-fifths in. 

 long, the uppermost (the longest) and lowest ones yel- 

 lowish brown, the laterals white; central spines 1-3, 

 setiform and flexuous, dark, 1 to one and one-fifth in. 

 long: flowers funnelform,.oue and three-fifths to 3 in. 

 long, yellow, scarlet within. Texas and Mexico. 



28. lieI6phorus, Lem. Depressed globose, light green, 

 with purple-red veins: ribs about 20, compressed, ob- 

 tuse: radial spines 9-12, very stout and porrect; central 

 spines 1-4, stronger and annulate; all the spines pearl- 

 gray, Mexico. 



ccc. Ribs SO or more. 



29. 0bvaU4tU8, DC. Obovate-globose, depressed: ribs 

 very numerous, vertical : spines most abundant towards 

 the apex, unequal, spreading, stout, whitish; the 3 up- 

 per radials and solitary central strong, the others (espe 

 daily the lowest) .small : flowers purple, with whitish 

 margin. Mexico. — The name was suggested by the ap- 

 pearance of the terminal cluster of flowers surrounded 

 by a fortification of strong spines. 



30. crispitus, DC. {£. drrigens, hink). Globose, 5 in. 

 or more high: ribs 30-60, compressed and sharp, more 

 or less undulate-crisped: spines 7-11, widely spreading, 

 more or less flattened, the upper larger and brown at 

 tip, the lower shorter and white, or all of tbem brown : 

 flowers purple, or white with purple stripes. Mexico 

 and Central America. 



cccc. Tuberculate, as in MammiUaria. 



31. hexsedrfiphorus, Lem. More or less globular, dark 

 gray: ribs deeply tuberculate, giving the appearance of 

 a Maramillaria, with hexagonal tubercles: radial spines 

 6 or 7, radiating like a star ; central spine solitary, erect, 

 longer; all the spines annulate, reddish brown: flowers 

 white, tinted with rose. Mexico. 



32. lopoth^le, Salm-Dyck. Globose, strongly tubercu- 

 late, after the manner of MammiUaria: tubercles quad- 

 rangular, bearing clusters of 5-10, more or less porrect, 

 long, rigid, and equal spines; central solitary or want- 

 ing: flowers white or yellowish. Mexico. 



BBB. Central spines 4 (S or S in Sileri and sometimes 



S in Scopa), 



c. Ribs less than IS. 



33. TObiistus, Otto. Clavate and stout: ribs about 8, 

 compressed, vertical- radial spines about 14, the upper 

 ones slender, the lowest 3 stronger; central spines 4, 

 4-angled at base, transversely striate, the lowest one 

 largest; all the spines purple-red, lJ^-3 in. long: flow- 

 ers golden yellow. Mexico. 



ECHINOCACTUS 



515 



34. Ottdnls, Link & Otto. Depressed-globose or ovate, 

 3^ in. high: ribs 10-12, obtuse: radial spines 10-18, 

 slender, yellowish, more or less straight and spreading, 

 about i4 in. long; central spines 4, duskv red, stronger, 

 the uppermost very .short, the two laterals horizontal, 

 the lowest longest (1 in.) anddeflexed: flowers lemon- 

 yellow, becoming 2-3 id. in diameter. Mexico. 



35. bicoloT, Gal. Globose-ovate, stout, lH-4 in. in 

 diam., sometimes becoming 8 in. high: ribs 8, oblique 

 and obtuse, compressed, tuberculate-interrupted : lower 

 radials and centrals variegated red and white; radials 

 9-17, spreading and recurved, slender and rather rigid, 

 the lowest one H-1 in. long, the laterals 1-2 in. long 

 and about equaling the 2-4 flat flexuous ashy upper 

 ones; centrals 4, flat and flexuous, 1^2-3 in. long, the 

 uppermost thin and not longer than the erect and rigid 

 laterals, the lowest very stout, porrect and very long: 

 flowers funnelform, bright purple, 2-3 in. long. North- 

 ern Mexico. 



oc. Ribs lS-27. 



.36. orthaointhus, Link & Otto, (E. flavovtrens, 

 Scheidw,). Globose, yellowish green: ribs 12 or 13, 

 vertical, acute: radial spines 14, unequal, straight and 

 spreading; central spines 4, stronger, the lowest the 

 largest; all the spines rigid, annulate, and grayish 

 white. Mexico. 



37. intertSxtus, Engelm. Ovate-globose, 1^ in. high: 

 ribs 13, acute, somewhat oblique, tuberculate-inter- 

 rupted, the tubercles with a woolly groove : spines 

 short and rigid, reddish from a whitish base and with 

 dusky tips; radial 16-25, closely appressed and inter- 

 woven, the upper 5 to 9 setaceous and white, straight, 

 one-fifth to K in. long, the laterals more rigid and a 



746. Echinocactus myrlostiema. 



little longer, the lowest stout and short, a little re- 

 curved; centrals 4, the 3 upper ones turned upward and 

 exceeding the radials and interwoven with them, the 

 lower one very short, stout and porrect: flowers about 

 1 in. long and wide, purplish. Texas and northern 

 Mexico. 



38. Orcuttii, Engelm. Cylindrical, 2-3^ ft. high, 1 ft. 

 in diam., single or in clusters up to 18 or more, not 

 rarely decumbent: ribs 18-22, often oblique: spines ex- 

 tremely variable, angled to flat, 5-4-3 in. wide; radials 

 11-13, unequal, lowest and several laterals thinnest; cen- 

 trals 4 : flowers about 2 in. long, deep crimson in center, 

 bordered by light greenish yellow. Lower California. 



39. Jdhnsoni, Parry. Oval, 4-6 in. high: ribs 17-21, 

 low, rounded, tuberculately interrupted, close set, often 

 oblique, densely covered with stoutish reddish gray 

 spines: radial spines 10-14. three-fifths to one and one- 

 third in. long, the upper longest; centrals 4, stouter, 

 recurved, about \% in. long: flowers 2 to two and three- 

 fifths in. long and wide, from deep red to pink. Utah, 

 Nevada, California. 



40. polyciphalus, Engelm. & Bigel. Globose (6-10 in. 

 in diam.) to ovate (10-16 in. high, 5-10 in. in diam.) and 

 cylindrical (reaching 24-28 in. high and about 10 in. in 



