972 MAMMILLARIA 



MAMMILLARIA 



Stems cespitose from the 

 grooi'es of the tubercles, 

 often denselji so: groove 

 without (jluiids but often 

 sphiose for most of its 

 length: radial spines 

 fewer and weulcer: cen- 



uig 



radians 

 . pectinata 

 . impexicoma 



sulcata 



Nickelsae 



UisBouriensia 



^'^^j:^^^ 



AA. Blossoms purple or purplish: 

 spines usually gray or glossy, 

 the centrals and tips black or 

 brown: ovary and friiit often 

 scale-bearing. 

 B. Badial spines 10 or more, 

 often very numerous, cover- 

 ing the whole plant: cen- 

 tra Is at maturity rarely less 

 than 4. 

 c. Glands small in a chain 

 in some of the grooves: 

 spines long but weak, not 



obscuring the body 17. macromeris 



cc. Glands none in axil or 



groove so far as known,. 18. conoidea 



19. vivipara 



20. radiosa 



21. dasyacantha 



22. tuberculosa 

 BB. Bad ill I spines less than 10: 



central solitary or wanting: 



tubercles largeand broad. .23. comuta 



Subgenus IV. Eumamillaria. Fls. usually small, 

 produced from the axils of grooveleas tubercles, 

 and nearly always remote from the vertex: fr. 

 usually clavateand red, nearly always desti- 

 tute of scales .". Species 



SUBGENUS 



CORYPHANTHA. 



Blossoms yellow: spines mostly 

 yellow or yellowish, one or 

 more honey-glands usually 

 found in the groove. 

 B. i'ls. remote from the vertex. 

 C. Glands one or two conspic- 

 uous red or yellow, in the 

 axils: stems long, in age 

 making large clumps: 

 spines rather slender: 

 radials J^-H in. long, 

 centrals %-% in. long... 



cc. Glands none in the axil... 4 

 BB. I'ls. cetitral or nearly so: 

 plants mostly globose or de- 

 pressed, 1)4-^ '»• *» diam- 

 eter: radial spines later- 

 ally compressed near the 

 base 5 



c. Stems nearly always sim- 

 ple: radial spines rather 

 rigid and pectinately 

 spreading: centrals 1-4, 

 the jippi-r turned up 

 „mn„., II,,- r.nlials, the 

 l,,,i; r ,1, //,.,■,, I or hori- 

 r.,,iil,il. Si„,-i,-;f closely 



raphidacantha 

 macrothele 

 erecta 

 recurvata 



flue 



comlfera 

 daimonoceras 

 echinus 

 scolymoides 



SUBGENUS II. DOLICOTHELE. 



SUBGENUS 



setispina 



Fondii 



Halei 



Juice watery: tubercles rarely 



angular. 



B. Spines (hooked) none: fls. 



yellowisli or whitish, with 



rosy stniikrd petals. 



c. Steiiix j,r,-,pnrt!,„uif,'hj slen- 



(hr: I „!,,■ r,-l,-x short- 



rii t ,' : III il i ,1 I spines 



ml . 



that the 



. Stems low, usually broader 

 than high. No bristles in 

 the axils, except in M. 

 Candida and M. phi- 



r>. Badial spines fen-, 

 not hiding the 



body 3 



3 

 l>l>. Badial spines nu- 

 merous, snowy 

 white, covering 

 and hiding the 



lasiacantha 

 . plumosa 

 . senilis 

 . barbata 

 , vetula 



