10.163 
Mamillaria 
Plant flowering April 1 
1912. 
Plant about 4 cm. high; diameter nearly 6 cm. largest diameter about 1.25 
cm, from ground; top truncate; tubercles well hidden by armament and sur- 
rounded by ?/ool at top, but not at sides except slightly; spines, radial. 
24, appressed, pectinate 
liiite, short, weak; centrals at sides usually 
shorter, stouter, white with tips slightly darker; at top centrals usually 
same length as radials, irith dark brown tips; flower near top, sessile; 
petals sub-lanceolate, acu 
U w ^ 
lig^ht purple; stamens numerous, short; an- 
thers yello?f; pistil about 1 cm. long, much exsert beyond stamens; stig 
Ilia lobes 5, small, whitish. 
Collected near Mexico City by A. 
S. Hitchcock, in 1910 
