NEOMAMMILLARIA. lOI 



46. Neomammillaria collinsii sp. nov. 



Plants becoming large clumps, the individuals globose, 4 cm. in diameter; tubercles terete, 

 milky, green, but becoming bronzed or even a deep purple ; axils of tubercles both lanate and setose ; 

 radial spines usually 7, pale yellowish below, with dark brown or blackish tips, subequal, 5 to 7 mm. 

 long ; central spine i , similar to or a little longer and usually darker than the radials ; flowers 1 2 to 

 15 mm. long; outer perianth-segments reddish with a yellowish margin, ciliate; inner perianth- 

 segments lighter, entire, acuminate; fruit clavate, 1.5 to 2 cm. long, deep red; seeds brownish. 



Collected by G. N. Collins at San Geronimo, near Tehuantepec, Mexico, December 

 1906, and flowered in Washington, July and August 1909, type, and near the same locality 

 by A. Groeschner, February 1923. 



Figures 96 and 103 are from photographs showing the type plant in flower and fruit. 



47. Neomammillaria chinocephala (J. A. Purpus). 



Mammillaria chinocephala J. A. Purpus, Monatsschr. Kakteenk. 16: 41. 1906. 



Plant-body globose, sometimes 8 cm. in diameter, almost hidden by the white spines ; tubercles 

 very milky ; axils of tubercles densely filled with white wool and numerous hair-like bristles ; tubercles 

 low; radial spines 35 to 40, somewhat pactinate, spreading; central spines 2 to 7, more or less diver- 

 gent, much stouter than the radials, rigid, white with brownish tips; flowers i cm. long, rose-red; 

 fruit clavate, red; seeds small, brown. 



Type locality: Sierra de Parras, Coahuila, Mexico. 



Distribution: Highlands of central Mexico. 



This species is common in collections, both living and dried, and it is surprising that it 

 remained so long undescribed. It was distributed by Pringle in 1890 as Mammillaria 

 acanthophlegma. It resembles very much a large plant of Mammillaria elegans, but the 

 tubercles are milky and bear setae in their axils. 



Illustrations: Monatsschr. Kakteenk. 16: 43; 20: 46, as Mammillaria chinocephala. 



Figure 99 is from a photograph of a plant collected by Dr. Purpus at Minas de San 

 Rafael, Mexico, in 19 10. 



48. Neomammillaria tenampensis sp. nov. 



Globose, light green, 5 to 6 cm. in diameter; tubercles 6 to 7 mm. long, 4-sided, milky, pointed; 

 axils of upper tubercles naked, but those producing flowers filled with yellow wool and numerous 

 yellow bristles, while in the older axils the wool disappears and the bristles become white; spines 



4 to 6, brownish with dark tips, ascending, surrounded at base by 8 to 10 small white bristles; wool 

 in young spine-areoles yellowish; outermost perianth-segments small, brownish, the outer ones 

 lanceolate, acuminate, similar to the inner ones, all ciliate ; inner perianth-segments reddish purple, 

 8 to 10 mm. long, lanceolate, apiculate, denticulate; stamens much shorter than the perianth- 

 segments; filaments pale below, purplish above; style reddish; stigma-lobes 4 or 5. 



Collected by C. A. Purpus in the Barranca de Tenampa, Mexico, in 1909 and flowered 

 in Washington in November 19 10. 



Figure 102 is from a photograph of the type specimen. 



49. Neomammillaria polygona (Salm-Dyck). 



Mammillaria polygona Salm-Dyck, Cact. Hort. Dyck, 1849. 120. 1850. 

 Cactus polygonus Kuntze, Rev. Gen. PI. i: 261. 1891. Not Lamarck, 1783. 



Subclavate, 10 cm. high, simple; axils of tubercles lanate and setose; tubercles 4-angled; radial 

 spines about 8, 2 or 3 upper ones minute, the 4 lateral ones and the lowermost one longer; central 

 spines 2, stout, brownish at tip, often long and recurved; flowers pale rose-colored; stigma-lobes 



5 or 6, linear. 



, Type locality: Not cited. 

 Distribution: Mexico, according to Labouret. 



Schumann lists this species among those unknown to him. Riimpler refers it to Mam- 

 millaria subpolyedra, but it must be related more nearly to M. polyedra, with which it was 

 compared by Salm-Dyck. We know it only from descriptions. 



