972 MAMMILLARIA 



MAMMILLARIA 



COO. stems cespitose from the 

 grooves of the tubercles, 

 often densely so: groove 

 without glands but often 

 spinose for most of its 

 length: radial spines 

 fewer and weaker: cen- 

 tral solitary or want- 



,ng 



Bliissiiiiix purple or purplish: 

 ^I'uux usually gray or glossy, 

 /!/' , , nhttls and tips black or 

 li,:in-H: in-ary and fruit often 



radians 

 . pectinata 

 . impexicoma 



sulcata 



Nickelsae 



Missouriensis 



orrni very numerous, cover- 

 ing the whole plant: cen- 

 trals 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. 



CO. Glands none in axil or 

 groove so far as known. .]8. 



19. 



radiosa 



dasyacantha 



tuberculosa 



BB. Radial spines less than 10: 

 central solitary or wanting: 

 tubercles large and broad , .22, 



Subgenus IV. Eumamillaria. Fls. usually small, 

 produced from the axils of grooveless tubercles, 

 and nearly always remote from the vertex : fr. 

 usually clavate and red, nearly always desti- 

 tute of scales Species 30-77 



SUBGENUS I. COEYPHANTHA. 



DOLICOTHELE. 



Blossoms yellow; spines mostly 

 yellow or yellowish, one or 

 more honey-glands ttsually 

 found in the groove. 

 B. Jf^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 %-% in. long, 

 centrals ii-% in. long... 



00. Glands none in the axi 

 3. Fls. central or nearly so: 

 plants mostly globose or de- 

 pressed, lii-S in. in diam- 

 eter: radial spines later- 

 ally compressed near the 

 base 



0. Stems nearly always sim- 

 ple: radial spines rather 

 rigid and pectinately 

 spreading: centrals 1-i, 

 the upper turned up 

 among the radials, the 

 lower deflexed or hori- 

 zontal. Species closely 

 related and perhaps con- 

 fluent 



4. recurvata 



, comiJera 

 , daimonoceras 



echinus 



scolymoides 



SUBGENUS III. COCHEMIEA 



2G. Roseana 

 '27. setispina 

 L'H. Pondii 

 29. Halei 



SUBGENUS IV. 



Juice watery: tubercles rarely 



angular. 

 B. Spines (hooked) none: fls. 

 yellowish or whitish, with 

 rosy streaked petals. 

 0. Stems proportionately slen- 

 der: tubercles short- 

 ovate: radial spines 

 rigid, spreading, re- 

 curved so that the points 



hardly project .SO. elongata 



31 Leona 



CO. Stems low, usually broader 



than high. No bristles in 



the axils, except in M. 



Candida and M. plu- 



mosa. 



D. Sadial e pines few, 



not hiding the 



body 32. decipiens 



33. fragilis 



DD. Sadial spines tiu- 



merous, snowy 



white, covering 



and hiding the 



whole plant 34. lasiacantha 



35. plumosa 

 3B. senilis 



37. barbata 



38. vetula 



39. Candida 



