J'Jchinocacius. CACTACE^. 245 



twisted ; the lower are shorter, darker, and terete, and the lowest middle one hooked • 

 flowers 1 to 1| inches long, yellow: few (2 to 5) rounded fringed sepals on the 

 ovary, 10 to If) oblong ones on the tube: petals about 8: stigmas 5 to 7, short- 

 seeds large, minutely tuberculated. — Cact. of Pacif. K. Hep. iv. 28, t. 1 : Bot Ives 

 Colorado Exp. 12. 



On the lower Colorarlo on the ronfincs of ralifornia, Arizona, and Utah (Bigelow; Ncwbcmi 

 H Enfjelmmin), and to Southern Colorado, Jirandcgcc. Heads .•} to .'> inches hifih ; spines 3 to 20 

 or 24 hues lonR, on prominent tul.ereles, which give the rihs a wavy or intorrnpte.l appearance : 

 seeds I, J to If hncH loiij^. ' ' ' 



2. E. polyancistnis, ICngelm. .^ I'.ig. Heads solitary, mid.lle-sized, ovate to 

 eylindncal, with 13 (to 1 7) interrupted ribs: outer spines 20 or more wliite tlio 

 uppermost broader and longer; central spines 5 to 10, the upper one broadest, long- 

 est, recurved, white, the others brown, terete, and mostly hooked : flowers yellow, 

 2 to 21 inches long, with about 8 rounded fringed sepals on the ovary • seeds as in 

 the last. —Cact. of Pacif. K. Rep. iv. 29, t. 2, lig. 1, 2. 



From the head-waters of the Mohave River {Biffdmo) to the sage plains of Southwestern Nevada, 

 Gahh. I erhnpa too nonr the last, from which it is (Hstinguisliod by tlin more muneious spines 

 inanvof thoninoroneshemg hooked, tlie larger (lowers, and more numerous sepals and petals 

 1 ends 3 to 10 inches high, 2 to 4 thick ; larger spines of the Moliave form 3 to 5 of the Nevada 

 plant only 1 or 2 inches long. 



+- +- Spines, at least the larger ones, transversely ribbed or anmdated. 



3. E. Viridescens, Nutt. Heads solitary, middle-sized, globose or depressed 

 with about 13 obtuse tuberculated ribs and a woolly depressed summit- spines 

 stout, reddish, straight or recurved, all annulatod, about 12 radiatin" and 4 (to 6) 

 stouter central ones : flowers greenish {\\ inches long), witli numerous (25 or more) 

 roundisli denticulate imbricated sepals on the ovary, as many on the tube, and about 

 tlie same number of oblong obtuse denticulate petals : stigmas 12 to 15, linear : berry 

 pulpy, green, scaly, with numerous small pitted seeds. — Torr. & Gray Fl i 554 • 

 Engelm. Cact. Mex. Bound. 24, t. 29. ' 



About Ran Diego, from the sea-l.each to tlie arid liilis and ri.lges inland ; cultivated in Europe 

 under the name oi E. Cahfornicm. Heads 4 to 7 inches in diameter, 3 to 5 inches high, more 

 rarely globose ; woolly vertical area (the youngest growth, where the spines are not yet d^veloiH>d) 

 an inch wide, surroimded l)y the numerous flowers. J l / 



4. E. cylindraceus, Kngelm. Heads middle-siml or largo, ovnl or cylindrical 

 ofbni proliferous at base, with 21 (to 27) obtuse somewhat tuberculate ribs, and a 

 woolly spineless dejiressed top : reddish spines all stout and nnnulated, recurve.l or 

 flexuouR, 12 to 18 exterior, tlio lowest usually hooked, and 4 very stout central ones : 

 yellowish flowers 2 inches long, with 40 to 50 rounded fringed sepals on the ovary, 

 and about 25 fringed petals : stigmas and fruit as in the last. — Cact. Mex. Bound 

 25, t 30. E. viridescens, var. (?) ^..cylindraceus, Engelm. in Am. Jour. Sci. 2 ser. 

 xiv. 338. 



Colorado desert {ralmcr, Bischof), to the eastern slope of the mountains near San Felipe, Parry. 

 Cose y allied to the last, from which it is distinguished by its higher growth, more numerous 

 rihs, larg.T and more numerous snincs, and larger flower and fruit. Young i)lants glohose, with 

 fewer ribs ; older ones much higher than thick, 2 or 3 feet high, a foot in diameter, witli 20 to 

 nearly ,{() ribs ; radial spines 1 or 2, the central 2 inches or over in length ; green beny about an 



5. E. Emoryi, Engelm. Heads solitary, large, globose or oval, with 13 to 20 

 obtuse tuberculated ribs: on the ovate areobne 8 or 9 robu.st reddish spines, angled 

 and annulated and slightly recurved, a stouter and longer one in the centre, turned 

 downward or more or le.is hooked : flowers large, i)urple, with numerous (25) reni- 

 form ciliato sepals on the ovary and as many spntulate ones on the tube : pclals 

 about the same number, lanceolate, laciniate-tootlicd towards the acuminate tip: 

 stigmas 18 to 20, erect, almost as long as the very robust style. — Eniorv Ken. 156 ; 

 Cact. Mex. Bound. 23, t. 28. J i > 



