972 



MAMMILLARIA 



MAMMILLARIA 



cc. Ceyitrals none 



.11. 

 12. 

 13. 



1354, Mammea Americana — Mammee Apple, or St. Domingo 

 Apricot ( X H) - (See page 071 . ) 



Subgenua IV. Etjmamillaria. 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. OOKTPHANTHA. 



A. Blossoms yellow: spines mostly 

 yellow or yelloivish, one or 

 more honey -glands usually 

 found in the groove. 

 B. /'7ii. 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 /i-}4 in. long, 

 centrals }i-% in. long... 



ccc. 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 iveaker: cen- 

 tral solitary or ivant- 



ing 14. 



15. 

 IG. 

 AA. Blossoms purple or purplish: 

 spines usually gray or glossy, 

 the centrals and tips black or 

 brown: ovary and fruit often 

 scale-bearing . 

 B. Radial spines 10 or more, 

 often very numerous, cover- 

 ing the whole plant: cen- 

 trals at mat^tr it y rarely less 

 than 4. 

 0. Glands small in a chain 

 in some of the grooves: 

 spines long but iveak, not 



obscuring the body 17. 



CO. Glands none in axil or 



groove so far as known. .18. 



19. 



20. 



21. 



22. 



BB. Eadial spines less than 10: 



central solitary or tvanting : 



tubercles largeand broad. .23. 



24. 



radians 



pectinata 



impexicoma 



sulcata 



NickelssB 



MiBSouriensis 



macromens 



conoidea 

 vivipara 



xadiosa 



dasyacantlia 



tuberculosa 



comuta 



elephantldens 



SUBGENUS II. DOLICOTHELE. 



25. longimamma 



SUBGENUS III. 



COCHEMIEA. 



26. £oseana 



27. setispina 



28. Pondii 



29. Halei 



SUBGENUS IV. 



CC. Glands none in the axil... 

 BB. Fls. central or nearly so: 

 plants mostly globose or de- 

 pressed, ly^-S in. in diam- 

 eter: radial spines later- 

 ally compressed near the 

 base 



c. 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 . 



, raphidacantha 

 macrothele 



. erecta 

 recttrvata 



Scheerii 

 , robustispina 



comifera 

 dalmonoceras 



echinus 

 scolymoides 



Juice watery: tubercles rarely 



angular. 

 B. Spines (Jwoked) none: fls. 

 yellowish or ivhitish, with 

 rosy streaked petals. 

 o. Stems proportionately slen- 

 der: tubercles short- 

 ovate: radial spines 

 rigid, spreading, re- 

 curved so that the points 



hardly project 30. 



31 



cc. Stems low, usually broader 



than high. No bristles in 



the axils, except in M. 



Candida and M. plu- 



mosa. 



D, Radial spines few, 



not h i d i n g the 



body 32. 



33. 



DD. Radial spines nu- 



m e r n s , s n o iv y 



white, cover i n g 



and hid i n g the 



whole plant 34. 



35. 

 36. 

 37. 

 38. 

 39. 



elongata 

 Leona 



decipiens 



fragilis 



lasiacantha 



plumosa 



senilis 



barbuta 



vetnla 



Candida 



