972 



MAMMILLARIA 



MAMMILLARIA 



cc. Centrals none 



11. 

 32. 

 13. 



1354. Mammea Americana Mammee Apple, or St. Domingo 

 Apricot ( X %) . (See page 971 . ) 



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. CORYPHANTHA. 



A. .Blossoms yellow: spines mostly 

 yellow or yellowish, one or 

 more honey-glands usually 

 found in the groove. 

 B. Fls. remote from the vertex. 

 c. Glands one or two conspic- 



uoiis red or yellow, in the 



axils: stems long, in age 



making large clumps: 



spines rather slender: 



radials %-% in. long, 



centrals %-% in. long... 1. 



2. 

 3. 



cc. Glands none in the axil... 4. 

 i. Fls. central or nearly so: 

 plants mostly globose or de- 

 pressed, l%-3 in. in diam- 

 eter: radial spines later- 

 ally compressed near the 

 base ...................... 5. 



raphidacantha 

 macrothele 

 erecta 

 recurvata 



C. Stems nearly always sim- 

 ple: radial spines rather 

 rigid and pectinately 

 spreading: centrals 1-4, 

 the upper turned up 

 among the radials, the 

 lower deflexed or hori- 

 zontal. Species closely 

 related and perhaps con- 

 fluent ., . . 



Scheerii 

 robustispina 



cornifera 



daimonoceras 



echinus 



scolymoides 



CCC. Stems cespitose from the 

 grooves of the tubercles, 

 often densely so: groove 

 without glands but often 

 spinose for most of its 

 length : radia I spines 

 fewer and weaker: cen- 

 tral solitary or want- 

 ing 14. 



15. 

 16. 



^. Blossoms purple or purplish: 

 spines us^(ally 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 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. 



CC. Glands none in axil or 



groove so far as known. .18. 

 19. 

 20. 

 21. 

 22. 



BB. Madia I spines less than 10: 

 central solitary or wanting: 

 tubercles large and broad.. 23. 

 24. 



radians 



pectinata 



impexicoma 



sulcata 

 Nickels 



Missouriensis 



macromens 



conoidea 

 vivipara 

 radiosa 



dasyacantha 

 tuherculosa 



cornuta 

 elephantidens 



SUBGENUS II. DOLICOTHELE. 



25. longimamma 



SUBGENUS HI. COCHEMIEA. 



26. Rose ana 



27. setispina 



28. Pondii 



29. Halei 



SUBGENUS IV. 



A. Juice watery: tubercles rarely 



angular. 



B. Spines (hooked) none: fls. 

 yellowish or whitish, with 

 rosy streaked petals. 

 c. Stems proportionately slen- 

 der: tubercles short- 

 ovate : radial spines 

 rigid, spreading, re- 

 curved so that the points 



hardly project 30. elongata 



31 Leona 



CC. Stems low, usually broader 

 than high. No bristles in 

 the axils, except in M. 

 Candida and M. plu- 

 mosa. 



D. Radial ? pines few, 

 not hiding the 



body 32. decipiens 



33. fragilis 



DD. Radial spines n u- 

 m e r o u s , snowy 

 white, covering 

 and hiding the 

 whole plant 34. lasiacantha 



35. plumosa 



36. senilis 



37. barbata 



38. vetula 



39. Candida 



