974 



MAMMILLARIA 



7 cornifera, DC. Tubercles ovate, thick, rather 

 crowded: radial spines 15-17, ashy white, G lines long; 

 central 1, longer and stouter, erect, somewhat curved. 

 Mexico. 



8. daimonociras, Lem. Vertex impressed, very woolly: 

 tubercles erect-conical: spines grayish ; radials 20 "or 

 more, the upper accessory ones fascicled; centrals usu- 

 ally 3, stronger, the 2 upper divaricate and somewhat 

 recurved, the lower horizontal or recurved. Mexico. 



9. Echinus, Engelra. Dififers from the above in the 

 less depressed shape and rather more numerous spines. 

 Southern Tex. to Mex. 



10. scolymoldes, Scheidw. At length somewhat ces- 

 pitose: tubercles conical, bent inwards and imbricated: 

 radial spines 14-20, whitish or horn-colored; centrals 

 1-4, longer and darker, the upper mingled with the up- 

 per radials, the lower stouter and bent downwards: fls. 

 2 in. in diam. Mex., south of the Rio Grande. 



11. radians, DC. Stems simple: axils naked: tubercles 

 oval, large: spines white, rigid, subtomentose. Mex. 



12. pectinita, Engelm. Stem simple: tubercles quad- 

 rangular at base, conical above; areolae round-oblong: 

 spines 16-24, yellowish, laterally compressed at base, 

 stiff, pectinate, somewhat recurved: fls. 2}4 in. in diam.; 

 petals broadest above, obtusish. Pecos river and Leon 

 Springs, Tex. 



13. impexicdma, Lem. Vertex deeply impressed, 

 densely woolly: tubercles somewhat angulate; areola 

 round: spines 18-20, gray, rigid, covering the whole 

 plant; veiy rarely a single porrect central. Mex. 



14. sulcita, Engelm. [if. calcar&ta. Engelra.). 

 Densely eespitose from the upper part of the groove: 

 tubercles 7-9 lines long, ovate-oblong, with dilated 

 base, somewhat imbricate, spreading in age: spines 

 gray, rigid, subulate; radials 12-15, the upper 3-5, fas- 

 cicled; central 1, recurved, wanting in younger plants: 

 fls. 2X in. in expansion, the tube red within; sepals not 

 fringed. Tex., from the Brazos to the Nueces river. 



15. Nickelsse, Brandg. (3f. mckelsii, Hort.). Very 

 near the preceding, but radial spines more numerous, 

 14-18, the fascicled upper ones much longer than the 

 lower, and no central. Mex., south of Laredo, Tex. 



16. MissouriSnsis, Sweet {M. mUtallU, Engelm.). 

 Nearly simple, 1-2 in. in diam.: tubercles cylindric- 

 conical, loose and spreading, slightly grooved: spines 

 white, weak, puberulent, not hiding the body; radials 

 12-17. ^l'r■■adiTlu'; .iiitral one longer and stouter, often 

 wuntinu'; lN.;it>'Hir 1 in. long, yellow to fawn-color, with 

 rrddili -n.ak. -.pals fimbriate; petals acute or acu- 

 niiiiati': In rry n<l. iln- shape and size of a small pea; 

 .sui-db bkiik aud pitted. Jtfoiit. to Kans. and E. Colo. 



Var. similis, Engelm. Cespitose, in clumps often a 

 foot broad: spines fewer: fl. and fr. larger. Kansas 

 river to Texas. 



Var. robiistior, Engelm. (M. Wlssmannii, Hildm.). 

 Almost simple: tubercles longer and looser: spines 

 smooth, rather short and stout; radials 10-12; central 

 1: fls. even larger than in J;f. »imi(is. Tex. 



17. macromdris, Engelm. Fig. 1355. Low, usually 

 .soon proliferous, dark green: tubercles large and long, 

 loose and spreading, but often incurved ; groove rather 

 short; radials 10-17, weak, slender and spreading; cen- 

 trals at maturity usually 4, somewhat stouter and much 

 longer, sometimes more than 2 in. long: fls. purple, 

 often 3 in. in expansion; petals erose, raucronate: fr. 

 with several scales on the ovary. Along the Rio Grande 

 from New Mexico to Texas. See, also, Fig. 746a. 



18. conoidea, DC. {M. strobilifdrmis, Engelm.). 

 Ovate-conical, with densely woolly vertex : tubercles 



MAMMILLARIA 



stiff; centrals usually 4, but sometimes as many as 8, 

 brownish, the upper erect-spreading, the lower stouter 

 and deflexed: fls. bright purple, 1-1/^ in. in expansion; 

 stigmas mucronate. From southern Br. Am., through 

 the upper Missouri region to E. Colo. 



20. radiosa, Eiiffrlm. Ovate or cylindrical, sometimes 

 proliferous: tnlif-n-lcs trrete: radial spines 20-30, white, 

 with dusky a|" x. ^ . ry uiiequai; centrals 4 or 5, stouter 

 and longir. lawny, u|.ii.r ones longer, lowest shorter 

 and horizmital : lis. 1,' _.-'_' in. in expansion; stigmas ob- 

 tuse. Southern Tex. and northern Mex. 



Var. Neo-Mexicana,Engelm. (M. HirscMiAna, Haage, 

 Jun.). Lower, more or less proliferous from the lower 

 grooves : radial spines 20-40, white ; centrals 3-12, 

 white below, blackish above. 



Var. boreilis, Engelm. Ovate or subglobose : radial 

 spines 12-20; centrals 3-6, purple-spotted. Very near 



M. 1 



vipar 



Var. ATiz6nica, Engelm. Globose or ovate, large: tu- 

 bercles long-cylindrical: radial spines 15-20, whitish; 

 centrals 3-6, deep brown above: fls. large, rose-colored. 

 N. Arizona. 



Var. des£rti, Engelm. Low, simple, with slender 

 nearly cylindrio tubercles: radial spines 15-20 ; centrals 

 8-10, reddish tipped : fls. straw-colored, with purplish 

 tips. Ivanpah, Calif. 



Var. chlorintha, Engelm. Cylindrical, sometimes as 

 much as 9 in. high : radial spines 20-25, almost in 2 

 series, gray; centrals 6-9, stouter, K-1 in. long, reddish 

 only at tip : fls. greenish yellow. S. Utah. 



Var. Alversoni, Coulter. "Foxtail CAcrrs." Robust 

 and branching, sometimes 10 in. long, glaucous: tuber- 

 cles short and broad, somewhat angled, forming more 

 or less distinct ribs: radial spines numerous; centrals 

 8-14, stout, spreading, blackish half-way down : fls. 

 pink. S. E. Calif. 



21. dasyac&ntha, Engelm. Simple, subglobose : tu- 

 bercles terete, loose : radial spines 25-35, hair-like, 

 white, with brownish apex; centrals 7-13, bristle-like, 

 pale below, brown above, longer, the most interior one 

 horizontal, sometimes wanting: seeds black, with nearly 

 basal hilum. Tex. 



^1^. 



stout ; centrals 3-5, stouter, blackish, the upper < 

 erect-spreading, the lower stouter, horizontal or de- 

 flexed : fls. about 1 in. in expansion, deep purple, paler 

 outside: fr. short, buried and hidden in the axillary 

 wool. N.E. Mex. 



19. vivipara, Haw. Fig. 1356. Low and depressed 

 globose, usually cespitose, forming large masses: tu 

 bercles terete and loose: radial spines 12-20, slender but 



*355 MammiUana 



22. tuberculdsa, Engelra. {M. strobiHf6rmis,ScheeT). 

 Ovate or eylindric, rather slender, somewhat dry of tex- 

 ture, the spines falling from the older tubercles, leaving 

 thera as dry, corky protuberances: tubercles short-ovate 

 from abroad base; axils densely woolly: radial spines 

 20-30, slender, rigid, white; centrals 5^9. stouter, our- 



