126 THE CACTACEAE. 
Mr. Robert Runyon says that this plant forms clumps usually about 10 cm. broad, 
but sometimes broader. It is never very plentiful but has a rather wide distribution, and 
seems to prefer mesquite thickets where the soil is very rich, but occasionally is found on 
rocky hillsides. 
Mammillaria pusilla mexicana, offered for sale by Grassner (Monatsschr. Kakteenk. 
February 1920), probably belongs here. 
Mammillaria caespititia Hortus was referred by Salm-Dyck as a synonym of M. 
multiceps. M. pusilla caespititia (Schelle, Handb. Kakteenk. 249. 1907) is the same. 
Mammiullaria parvissima Karwinsky (Wochenschr. Gartn. Pflanz. 1: 27. 1858) is some- 
times credited to Meinshausen, but seems never to have been described. M. perpusilla 
Meinshausen, given only as a synonym, belongs here and the name occurs on the page 
mentioned above. 
Fic. 134.—Neomammillaria multiceps. 
Illustrations: Cact. Mex. Bound. pl. 5; Cact. Journ. 2: 93; Forster, Handb. Cact. ed. 
2. 262. f. 25; Schelle, Handb. Kakteenk. 249. f. 168, as Mammillaria pusilla texana. 
Plate xiv, figure 5, shows a very small plant in flower, collected by Robert Runyon 
near Brownsville, Texas, in 1921; figure 6 shows a plant received from the Missouri Botan- 
ical Garden in 1904 which flowered in the New York Botanical Garden in March 1912. 
Figure 134 is from a photograph of a plant collected near Victoria, Mexico, by Dr. Edward 
Palmer, which was grown for many years in Washington; figure 133 shows a small plant 
photographed by Robert Runyon on July 10, 1921. 
84. Neomammillaria camptotricha ( Dams). 
Mammillaria camptotricha Dams, Gartenwelt 10: 14. 1905. 
Plants globose, cespitose, deep green, 5 cm. in diameter; tubercles somewhat elongated, often 
curved, 2 cm. long, terete, not at all milky, bearing bristles in the axils: spines 2 to 4, described as 
up to as many as 8, yellowish, bristle-like, spreading and twisted or bent, often 3 cm. long; spine- 
areoles small, circular, a little woolly at first; axils of tubercles bristly; flowers small, about 1 cm. 
ong; outer perianth-segments greenish; inner perianth-segments white, 10 mm. long, acute. 
