972 



MAMMILLARIA 



MAMMILLARIA 



ceo. stems cespitose from the 

 grooves of the tubercles, 

 often densely so: groove 

 without glands hut often 

 spinose for most of its 

 length: radial spines 

 fewer and weaker: cen- 

 tral solitary or want- 



a Americana — Mammee Apple, or St. Domineo 



Apricot (X!^). (Seep.lge971.) 



Subgenus IV. Ei'Mamillabia. Pis. usually small, 

 produceil from the axils of grooveless tubercles, 

 and nearly always remote from the vertex: fr. 

 usually oiavate and red, nearly always desti- 

 tute of scales Species 30-77 



SUBGENUS I. COETPHANTHA. 



A. Blossoms yellow: spines mostly 



yellow or yellowish, one or 



more honey-glands usually 



found in the groove. 

 B. t'ls. remote from the vertex. 



C. Glands one or two conspic- 

 uous red or yellow, in the 

 arils: stems long, in age 

 making large clumps: 

 spines rather slender: 

 radials %-% in. long, 

 centrals Vi-Vi in. long... 



cc. Glands none in the axil ... 

 ?B. Fls. central or nearly so: 

 plants mostly globose or de- 

 pressed, 1)4-^ '»■ *"■ diam- 

 eter: radial spines later- 

 ally compressed near the 

 base 



raphidacantha 

 macro thele 

 , erecta 

 reourvata 



Stems nearly always sim- 

 ple: radial spines rather 

 rigid and peclinately 

 spreading: centrnls 1-4, 

 the upper turned up 

 among the radials, the 

 lower deflexed or hori- 

 zontal. Species closely 

 related and perhaps con- 

 fluent 



Scheerii 

 robuBtispina 



. comifera 

 . daimonoceras 

 , echinus 

 , scolymoides 



Blossoms purple or purplish: 

 spines usually gray or glossy, 

 the centrals and tips black or 

 brown: ovary and fruit often 

 scale-bearing . 

 B. Sadial spines 10 or more, 

 iifttti ntif nmiurous, cover- 

 ing llif irhi'lf plant: cen- 

 Inifs nt ntatii ritif rarely less 

 than, 4. 

 C. Glands small in a chain 

 in some of the gi-ooves: 

 spines long hut weak, not 

 obscuring the body .... 

 CC. Glands none in axil 

 groove so far as known 



radians 

 , pectinata 

 , impexicoma 



sulcata 



Nickelsae 



Missouriensis 



BE. Badial spines less than 10: 

 central solitary or wanting: 

 tubercles large and broad.. 23. 



17. macromeris 



conoidea 

 . vivipara 

 . radiosa 

 . dasyacantha 

 . tuberculosa 



comuta 

 elephantidens 



SUBGENUS II. DOLICOTHELE. 



25. longimamma 



SUBGENUS HI. COCHEMIEA. 



2G. Boseana 



27. setispina 



28. Pondii 



29. Halei 



SUBGENUS IV. 



A. Juice watery: tube^rles rarely 

 angular. 

 B. Spines (hnokrd) none: fls. 

 yell'nri.-ili :.r iihitish, with 

 rosl/ sirrnk.il prtals. 



O. Stt'tns 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, tisually broader 



than high. No bristles in 



the axils, except in M. 



c andida and M. plu- 



mosa. 



D. Radial ■•■ p i n e s few, 



not h i d i n g the 



body 32. decipiens 



3.i. fragilis 

 DD. Ha dial spines nu- 

 m e r o u s , sno w y 

 white, covering 

 and hiding the 

 whole plant 34. lasiacantha 



35. plumoBa 



36. senilis 



37. barbata 



38. vetula 



39. Candida 



