NEOMAMMILLARIA . 



69 



Key to Species — continued. 



CC. Seeds black. 



D. Fruit elongated, clavate, ripening quickly. 

 E. Seeds not rugose. 



F. Plants usually small; spines setaceous to delicately acicular. 

 ' Central spines yellow. 



Central spines glabrous 109. 



Central spines pubescent. 



Flowers white i lo- 



Flowers yellowish 1 1 1 • 



Central spines red to brown. 

 Outer perianth-segments eiliate. 



Central spines shorter than flower; perianth-segments acute 112. 

 Central spines longer than flower; perianth-segments obtuse 113. 

 Outer perianth-segments entire. 

 Axils of tubercles setose. 



Inner perianth- segments white to yellowish. 

 Central spines 3 or 4. 



Radial spines about 25 ; flowers 2 cm. long 



Radial spines about 20; flowers i cm. long 



Central spines 7 to 9 



Inner perianth-segments red or reddish. 

 Radial spines weak and hair-like. 



Central spines several 



Central spine solitary 



Radial spines stifi'. 



Radial spines glabrous 



Radial spines pubescent 



Axils of tubercles not setose. 

 Flowers 2.2 cm. long or more. 



Central spines solitary 



Central spines 3 



Flowers i to 1.5 cm. long. 



Plants cespitose 



Plants solitary. 



Inner perianth-segments acuminate 



Inner perianth-segments acute only 



FF. Plants stout; central spines at least stout-acicular to subulate. 

 G. Outer perianth-segments eiliate. 



Fruit purple, ovoid to globular. 



Radial spines 15 or less; fruit large (25 mm. long) 



Radial spines 20 to 30; fruit 10 to 15 mm. long 



Fruit scarlet, clavate. 



Outer perianth-segments long-ciliate 



Other perianth-segments and upper scales short-ciliate. 



Perianth rotate ; stigma-lobes red 



Perianth campanulate ; stigma-lobes green. 



Flowers white 



Flowers purple to pinkish. 



Radial spines often as many as 30. 



Inner perianth-segments acuminate 



Inner perianth-segments usually obtuse or 



rounded 



Radial spines often as few as 12; inner perianth- 

 segments acute 



GG. Perianth-segments not cihate. 

 H. Setae in axils of tubercles. 



I. Seeds constricted above base. 



J. Flowers greenish or pink, and small. 



K. Flowers greenish, 10 to 12 mm. long; cen- 

 tral spines yellowish to reddish I34- 



KK. Flowers pink, 20 mm. long or more; cen- 

 tral spines dark brown i35- 



JJ. Flowers nearly white, seeds much larger 136. 



II. Seeds not constricted above base. 



Central spines several; flowers yellowish I37- 



Central spines usually solitary ; flowers rose-colored. 138. 

 HH. Setae wanting in axils of tubercles. 



I. Flowers rotate , i39- 



II. Flowers campanulate. 

 Plants globose. 



Flowers white 1 40- 



Flowers pink to purplish. 



Inner perianth-segments obtuse 141- 



Inner perianth-segments acute to acuminate. 142. 

 Plants slender, elongated and cylindric. 



Flowers small, pinkish I43- 



Flowers large, purplish i44- 



' EE. Seeds rugose (perhaps a generic type) i45- 



DD. Fruit depressed, long-persisting (perhaps a generic type) 146 



AAA Species not grouped: 147, A^. tacubayensis; 148, N. umbrina; 149, N. verhaerhana; 150, N. 



N. pygmaea 



N. wildii 

 N. seideliana 



N. barbata 



N. mercadensis 



N. kunzeana 



N. hirsuta 



N. multihamata 



N. longicoma 

 N. bocasana 



N. multiformis 

 N. scheidweileriana 



21. N. saffordii 



22. N. schelhasei 



23. N. glochidiata 



26. 



io. 



31- 



33 



N. trichacantha 

 N. painleri 



N. wrighlii 

 N. viridiflora 



N. wilcoxii 



N. mainae, 



N. boedekeriana 



N. microcarpa 

 N. milleri 

 N. sheldonii 



N. armillata 



N. fraileana 

 N. swinglei 



N. dioica 

 N. goodridgei 



N. zephyranthoides 



. N. jaliscana 

 . N. bombycina 



. N. occidentalis 

 . N. fasciculala 

 . N. nelsonii 

 . N. longiflora 

 xanthina. 



