NEOMAMMILLARIA. 
KEY TO SPECIES—continued. 
DD. Axils of tubercles with bristles as well as wool (33-53). 
E. Some of spines much elongated, curved, and flexuous. 
67 
Definite central spines wanting..................c00-00--05. 
Central spines present. . ++ 34. N. compressa 
Central spines weak........... 00... c cece ecccccuecccccuce 35. N. mystax 
Central spines stiff... 2.0.0.0... cece cee cece ec ececeees 36. N. petterssonii 
EE. None of spines elongated, or if elongated, not flexuous. 
F. Tubercles terete or nearly so. 
G. Axils of tubercles bearing yellow WOOL... .. cee eee ee eee 37. N. etchlamiit 
GG. Axils of tubercles bearing white wool. 
H. Spines all radial. 
Spines 5 or 6, in young plants sometimes only 4....... 38. N. karwinskiana 
Spines alwayS 4...........: cece ccc cecccecececeuns 39. N. praelii 
HH. Spines both radial and central. 
I. Radial spines numerous, 12 or more. 
Central spines reddish, not much longer than the 
radials. 
Outer perianth-segments ciliate............... 40. N. standleyt 
Outer perianth-segments setose............... 41. N. evermanniana 
Central spines elongated, usually white except at tip. 
Flowers yellow.......... 0.20 c eee ce cence eee 42. N. parkinsonii 
Flowers dark red.......... 0. cece eee ene eee 43. N. geminispina 
II. Radial spines few, 5 to 9. 
Spines black when young..................6.4. 44. N. pyrrhocephala 
Spines at most brownish. 
Flowers yellow. ......... 0.00 ccc ee eee eee eens 45. N. woburnensis 
Flowers pinkish............ 0... cee ee eeeees 46. N. collins 
FF. Tubercles strongly angled. 
G. Spines both radial and central.. 
Radial spines numerous........... 000 ee cece e ee ee eee 47. N. chinocephala 
Radial spines few, bristle-like. 
Central spines 4 tO 6.......... cee cece cee eee eee 48. N. tenampensis 
Central spines 2..... 0.0... cece eee eee ee teenies 49. N. polygona 
GG. Spines few, all of one kind. 
Flowers yellow. ....... 0... cee cee cee tener eee eens 50. N. confusa 
Flowers rose-colored or white. 
Flowers rose-colored. _ 
Plants globose; stigma-lobes 4 or 5........---++-5- 51. N. villifera 
Plants cylindric; stigma-lobes 8...........-.-+0-0- 52. N. polyedra 
Flowers white.............-02 eee eee eee 53. N. conzatttt 
CC. Milk-tubes developed, if at all, only in stem; tubercles not milky (54-80). : 
D. Central spines wanting. . 
Spines subulate; areoles elliptic. ....... 00.0. cece cece eee rete eees 54. N. napina 
Spines mostly acicular; areoles circular. 
Spines mumerouS. .......... 00 cece cece eee eee tee e eee ete eneee 55. N. lanata 
Spines few (4 to 6). . 
Spines 5 or 6, short, straight seca encore esesosoeee Poeccceeresseece 56. N. kewensis 
Spines 4, elongated, curved. 
Flowers large (2.5 cm. broad)........-. eee eee rece eee eters 57. N. subpolyedra 
Flowers small. . 
Spines long and weak...........e eee eee rete eee ten eeees 58. N. galeottit 
Spines subulate......... 0.0 cee tere ee ee erent eee e eee taee 59. N. tetracantha 
DD. Central spines present. . 
E. Central spines usually 2, sometimes solitary. 
F. Radial spines 20 or more. : . 
Central spines stout and not very long; stigma-lobes white. 
Plant round or nearly so at apex; central spine often I....... 60. N. elegans sell 
Plant strongly umbilicate; central spines always 2......------ 6r. iv . pseudoper ella 
Central spines long. ..........-2 eee eerste erent ttt eres 62. N. dealbata 
FF. Radial spines 20 or fewer. ; 
Radial spines white, bristle-like. 
Stigma-lobes red. 
Clobose or somewhat elongated... ......---see seer ereees 63. x . haageana 
Depressed-globose ccc ence eee ence een ee eee eee en enr eens 4. N. perbella 
Stigma-lobes white. . 
Radial spines appressed. .....----+eeeeeereerrrersreete 65 . x colina. 
Radial spines not appressed........------ seeeee ee 66. WY. dowan 
Radial spines brownish when young, stouter than in the last..... 7. N. 
EE. Central spines usually 4, sometimes more. 
F. Central spines white or yellow. 
Radial spines white. 
lant globose. . . 
® Axils of tubercles not setose; central spines usually 4...... 68. x celsiang 
Axils of tubercles setose; central spines usually 9......-. 9. N. aureicep 
Plant cylindric. 70. N. yucatanensis 
Plants from Yucatan.......----eeeererreeee IO ON. puestii 
Plants from Central America.....---+++sssrrerrrsrrrrts 
