STANDLEY TREES AND SHRUBS OF MEXICO. 991 



Simple, cylindric or somewhat broader above; axils of tubercles setose; 

 tubercles 12 mm. long, flattened dorsally, angled, pointed; spines 4, ascending, 

 short, grayish with purplish tips ; flowers inconspicuous, reddish ; inner peri- 

 anth segments short-acuminate. 



46. Neomammillaria conzattii Britt. & Rose, Cactaceae 4: 103. 1923. 

 Type from Cerro San Felipe, Oaxaca. 



Short-cylindric, 8 cm. high, sometimes branched at apex, dark green, very 

 milky; axils of young tubercles bearing an abundance of white wool and con- 

 spicuous white bristles ; tubercles 4 to 5 mm. long, somewhat angled ; young 

 spine areoles woolly ; spines 4 or 5, all radial, somewhat spreading, brownish, 

 the tips usually darker than the bases ; flowers white, campanulate, sometimes 

 tinged with red, about 2 cm. long, the segments somewhat spreading, nar- 

 rowly oblong, the outer ones serrulate, apiculate. 



47. Neomam.millaria napina (Purpus) Britt. & Rose, Cactaceae 4: 104. 1923. 

 Mammillaria napina Purpus, Monatsschr. Kakteenk. 22: 161. 1912. 

 Southern Mexico ; tji^e from mountains west of Tehuacdn, Puebla. 



Roots thick, elongate when small, single, but when in a cluster of 3 or 4, 

 somewhat spindle-shaped ; plants globose, 4 to 6 cm. in diameter ; tubercles 

 low, terete in section, not at all milky; spines all radial, 10 to 12, pectinate, 

 white or yellowish, spreading and interlacing. 



48. Neoniamniillaria lanata Britt. & Rose, Cactaceae 4: 104. 1923. 

 Type from Rio de Santa Luisa. 



Small, short-cylindric ; tubercles 2 to 4 mm. long ; spine areoles short-elliptic ; 

 spines 12 to 14, all radial, widely spreading, white except the brown bases; 

 flowering areoles very woolly, the young flowers surrounded by a mass of long 

 white hairs ; flowers 6 to 7 mm. long, red ; inner perianth segments about 15, 

 oblong, obtuse or acutish, spreading above. 



49. Neomammillaria kewensis (Salm-Dyck) Britt. & Rose, Cactaceae 4: 104. 

 1923. 



Mammillaria kewensis Salm-Dyck, Cact. Hort. Dyck. 1849. 112. 1850. 



Mexico, but range not known. 



Globose to cylindric, 3 to 4 cm. in diameter ; tubercles short, terete, when 

 young short-woolly in the axils and at the areoles ; spines 5 or 6, all radial, 4 

 to 5 mm. long, brown with dark tips ; axils of tubercles bearing crisp hairs ; 

 flowers about 15 mm. long, reddish purple ; perianth segments lanceolate, acute. 



50. Neomammillaria subpolyedra (Salm-Dyck) Britt. & Rose, Cactaceae 4: 

 105. 1923. 



Mammillaria suhpolyedra Salm-Dyck, Hort. Dyck. 343. 1834, 



Hidalgo. 



Solitary, subcylindric, 10 cm. high, 6 cm. in diameter ; tubercles pointed, 

 strongly angled ; axils and spine areoles white-woolly ; spines 4, at first black- 

 ish purple, becoming paler but the tips remaining purplish, the lowest one 

 largest ; flowers 2.5 cm. broad ; perianth segments obtuse, erose, with darker 

 midrib ; fruit red, 2.5 cm. long, pyriform, 12 mm. in diameter at apex. 



51. Neomammillaria galsottii (Scheidw.) Britt. & Rose, Cactaceae 4: 105. 

 1923. 



Mammillaria galeottii Scheidw. Hort. Belg. 4: 93. 1837. 



Mexico, the range not known. 



Simple or cespitose, the joints globose ; tubercles pointed ; spines 4, elongate, 

 the upper ones erect and connivent over the apex of the plant, on the older 

 tubercles weak and spreading, 2.5 cm. long. 



