152 



THE CACTACEAE. 



Plant globose, small, 2 cm. in diameter, almost hidden by the spines ; tubercles without bristles 

 in their axils ; radial spines about 20, stiff, white, puberulent under a hand lens ; central spines 4 or 

 5, ascending, dark brown, one hooked, puberulent; flowers 15 mm. long, greenish white, the outer 

 segments brownish; inner perianth-segments broad, with an ovate acute tip; stamens white; 

 stigma-lobes cream-colored. 



Type locality: Near San Juan del Rio, Queretaro. 



Distribution: Central Mexico. 



Collected in Queretaro, Mexico, in 1905 by J. N. Rose. It has flowered repeatedly in 

 cultivation (August 1909, June 1911, 1912, April 191 5), and is nearest perhaps to Neoinam- 

 millaria kunzeana and A^. multihamata, but the axils of the tubercles are naked. 



Illustrations: Monatsschr. Kakteenk. 27: 23, as Mammillaria painteri; Monatsschr. 

 Kakteenk. 28: 103, as M. erythrosperma and var. similis. 



Figure 169 is from a photograph of the type plant. 



Fig. 169. — NeomammiUaria painteri. 



Fig. 170. — NeomammiUaria microcarpa. 



126. NeomammiUaria wrightii (Engelmann). 



Mammillaria wrightii Engelmann, Proc. Amer, Acad. 3: 262. 1856. 

 Cactus wrightii Kuntze, Rev. Gen. PI. i: 261. 1891. 



Depressed-globose, simple; tubercles terete, 10 to 12 mm. long, with naked axils; radial spines 

 8 to 15, white, spreading, acicular; central spines i to 3, stouter than the radials, brown to black, 

 I or sometimes 2 or 3 hooked at apex ; flowers large, 25 mm. long and as broad as long when expanded ; 

 outer segments about 13, triangular-obtuse, fimbriate; inner perianth-segments bright purple; fruit 

 obovoid, large, 25 mm. long, purple; seeds 1.5 mm. long, black, with a narrow ventral hilum. 



Type locality: Anton Chico on the Pecos east of Santa Fe, New Mexico. 



Distribution: Mountains of northeastern New Mexico. 



Mammillaria wrightii as described by Dr. Engelmann is complex, his original descrip- 

 tion being based on two collections, one from the upper Pecos, the type, and one from 

 the Santa Rita Copper mines in southwestern New Mexico. This latter specimen is referable 

 to a new species described below. There has always existed much confusion regarding 

 M. wrightii, and several species have been distributed under that name. It is very rare in 

 collections. In the National Herbarium we have only a part of the type (3 clusters of spines) 

 and spines and fruit collected by J. W. Toumey at White Oaks, New Mexico, October 20, 

 1896. Engelmann cites a specimen in Mexico (near Lake Santa Maria) which doubtless is 

 to be referred elsewhere. 



This species was named for Charles Wright (1811-1855), who explored extensively in 

 Texas and Cuba. 



