STANDLEY TREES AND SHRUBS OF MEXICO. 987 



26. Neomammillaria carnea (Zucc.) Britt. & Rose, Cactaceae 4: 88. 1923. 

 MammlUarla carnea Zucc. ; Pfeiff. Enum. Cact. 19. 1837. 

 Mammillaria subtetragona Dietr. AUg. Gartenz. 8: 169. 1840. 

 Mammillaria aeruginosa Scheidw. AUg. Gartenz. 8: 338. 1840. 

 Mammillaria pallescens Scheidw. AUg. Gartenz. 9: 42. 1841. 



Central and southern Mexico, the type from Ixmiquilpan, Hidalgo. 



Plants solitary, cylindric, 8 to 9 cm. high; tubercles strongly 4-angled, the 

 axils woolly, the upper ones erect ; radial spines none ; central spines 4, straight, 

 reddish, the lower one 10 mm. long, twice as long as the other 3; flowers 

 borne in the old axils; outer perianth segments nearly 2 cm. long, nearly 

 erect, flesh-colored; fruit pear-shaped, obtuse, bright red. 



27. Neomammillaria lloydii Britt. & Rose, Cactaceae 4: 89. 1923. 

 Zacatecas. 



Plant body at first flattened but in cultivation becoming elongate, sometimes 

 10 cm. long, 6 to 7 cm. in diameter; axils of young tubercles only slightly 

 woolly; tubercles milky, small, numerous, 4-angled, woolly when quite young; 

 radial spines 3 or 4, ascending, glabrous, the uppermost one red or dark brown, 

 the others whitish, 2 to 5 mm. long; central spines none; flowers in a ring 

 near the center of plant; outer perianth segments dark red with light or 

 colored margins, the inner white with a tinge of red and dark red central 

 stripes, not ciliate, apiculate, spreading above. 



28. Neomammillaria zuccariniana (Mart.) Britt. & Rose, Cactaceae 4: 89. 

 1923. 



Mammillaria zuccariniana Mart. Nov. Act. Nat. Cur. 16: 331. 1832. 



San Luis Potosi. 



Globose to elongate-cylindric, 8 to 20 cm. long, bluish green, milky; areoles 

 and axils of young tubex'cles filled with white wool; radial spines wanting 

 or represented by very stout bristles; central spines 2 to 4, black, unequal, 

 2 to 12 mm. long, spreading; flowers about 1 cm. long, with a broad open 

 throat ; outer perianth segments brownish, acute, the inner lanceolate, acute, 

 entire, magenta ; fruit red, 10 mm. long ; seeds brownish. 



29. Neomammillaria formosa (Galeotti) Britt. & Rose, Cactaceae 4: 99. 1923. 

 Mammillaria formosa Galeotti; Scheidw. Bull. Acad. Brux. 5: 497. 1838. 

 San Luis Potosi ; type from San Felipe. 



Somewhat clavate, sunken at apex ; axils lanate ; tubercles spirally arranged, 

 obtusely 4-angled, light green ; areoles naked ; radial spines 20 to 22, white, 

 rigid, radiating; central spines 6, spreading, thickened at base, at first flesh- 

 colored at base, black at tip, becoming black throughout or grayish ; flowers red. 



30. Neomammillaria compressa (DC.) Britt. & Rose, Cactaceae 4: 90. 1923. 

 Mammillaria cmnpressa DC. Mem. Mus. Hist. Nat. 17: 112. 1828. 

 Mammillaria subangularis DC. Mem. Mus. Hist. Nat. 17: 112. 1828. 

 Mammillaria triacantha DC. Mem. Mus. Hist. Nat. 17: 113. 1828. 

 Mammillaria ciri-Jiifera Mart. Nov. Act. Nat. Cur. 16: 334. 1832. 

 Mammillaria angularis Link & Otto ; Pfeiff. Enum. Cact. 12. 1837. 

 Mammillaria squarrosa Meinsh. Wochenschr. Gartn. Pflanz. 2: 116. 1850. 

 Mammillaria oettingenii Zeissold, Monatsschr. Kakteenk. 8: 10. 1898. 

 Mammillaria kleinsc'hmidti<ina Zeissold, IMonatsschr. Kakteenk. 8: 21. 1898. 

 Queretaro, San Luis Potosi, and elsewhere in central Mexico. 



Growing in large clumps, cylindric, pale bluish green ; axils of tubercles 

 white-woolly, setose; tubercles short, compressed laterally, keeled below, more 

 rounded above; young spine areoles white-woolly; principal spines 4, some- 



