NEOMAMMILLARIA. 81 
Collected at San Carlos Bay, Sonora, Mexico, by Ivan M. Johnston in 1921 (No. 
4373) and flowered in Washington in April 1922 and April 1923. 
Figure 72b is from a photograph of the type specimen. 
716. Neomammillaria melanocentra (Poselger). 
Mammillaria melanocentra Poselger, Allg. Gartenz. 23:17. 1855. 
~ Mammillaria erinacea Poselger, Allg. Gartenz. 23: 18. 1855. 
Mammillaria valida Weber, Dict. Hort. Bois 806. 1898. 
Short-cylindric, glaucous-green; tubercles in 8 and 13 spirals, strongly angled; radial spines 6, 
stout-subulate, 1.5 to 2 cm. long, brownish; central spines solitary, black, 2 to 3 cm. long, greatly 
overtopping the stem; flowers pinkish red, the segments linear, acute. 
Fic. 726.—Neomammillaria johnstonii. 
Type locality: Near Monterey, Mexico. 
Distribution: Mexico, but range unknown. — 
Illustration: Blithende Kakteen 3: pl. 129, as Mammillaria melanocentra. 
Figure 73 is a reproduction of the illustration cited above. 
17. Neomammillaria runyonii sp. nov. 
Plants deep-seated, depressed; tubercles milky, 
their tips widely separated from each other, their ax1 
. ‘We- - lly 
young, sometimes permanently so; young spine-areoles long-woolly, _ . 
spines 6 to 8, slightly ascending, the outer ones stouter and often dark brown in color, the inner ones 
about half the length of the outer and nearly white; centr al spine sclitary ‘ brown e Diack, erect 
10 to 14 mm. long; flowers about 2 cm. long, purple; perianth-segments oblong; fruit red, , 
'2 to 16 mm. long; seeds brown. 
: i bert Runyon in 1921. 
Collected on El Mirador, near Monterey, Mexico, by Ro pe 
Plate x, figure 2, is from a photograph of one of the plants Mr. Runyon originally 
brought from El Mirador. 
elongated, 1.5 cm. long, strongly 4-angled, 
Is long-woolly (never setose), especially when 
but in age glabrate; radial 
