126 



the; cactaceae. 



Mr. Robert Runyon says that this plant forms clumps usually about lo 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. 



Mammillaria parvissima Karwinsky (Wochenschr. Gartn. Pflanz. i : 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. 



Fig. 134. — Neomamtnillaria multiceps. 



Illustrations: Cact. Mex. Bound, pi. 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 192 1 ; figure 6 shows a plant received from the Missouri Botan- 

 ical Garden in 1904 which flowered in the New York Botanical Garden in March 191 2. 

 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 Rimyon on July 10, 192 1. 



84. Neomammillaria camptotricha (Dams). 



Mammillaria camptotricha Dams, Gartenwelt lo: 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 i cm. 

 long; outer perianth-segments greenish; inner perianth-segments white, 10 mm. long, acute. 



