122 THE CACTACEAE. 
Mammillaria rhodantha sulphurea Salm-Dyck, Cact. Hort. Dyck. 1849. 11. 1850. 
Mammillaria rhodantha ruficeps Salm-Dyck, Cact. Hort. Dyck. 1849. 11. 1850. 
Mammillaria chrysacantha fuscata Salm-Dyck, Cact. Hort. Dyck. 1849. 12. 1850. 
Mammillaria rhodantha rubescens Salm-Dyck, Cact. Hort. Dyck. 1849.97. 1850. 
Mammillaria odieriana rigidior Salm-Dyck, Cact. Hort. Dyck. 1849. 98. 1850. 
Mammillaria lanifera Salm-Dyck, Cact. Hort. Dyck. 1849. 98. 1850. Not Haworth, 1824. 
? Mammillaria russea Dietrich, Allg. Gartenz. 19: 347. 1851. 
Mammillaria odieriana rubra Sencke in Forster, Handb. Cact. ed. 2. 295. 1885. 
Mammillaria odieriana cristata Hortus in Férster, Handb. Cact. ed. 2. 295. 1885. 
Mammillaria tentaculata picta Forster, Handb. Cact. ed. 2. 309. 1885. 
Mammillaria crassispina rufa Riimpler in Férster, Handb. Cact. ed. 2. 311. 1885. 
Cactus chrysacanthus Kuntze, Rev. Gen. Pl. 1: 260. 1891. 
x Cactus crassispinus Kuntze, Rev. Gen. Pl. 1: 260. 1891. 
Cactus fuscatus Kuntze, Rev. Gen. Pl. 1: 260. 1891. 
Cactus odieranus Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Cactus pyrrhochroacanthus Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Cactus rhodanthus Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Cactus *uficeps Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Cactus stenocephalus Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Cactus stuebert Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Cactus tentaculatus Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Cactus capillaris Coulter, Contr. U. S. Nat. Herb. 3: 107. 1894. 
Cactus rhodanthus sulphureospinus Coulter, Contr. U. S. Nat. Herb. 3: 107. 1894. 
Mammillaria rhodantha pfeiffert Schumann, Gesamtb. Kakteen 550. ‘1898. 
Mammillaria rhodantha rubra Schurnann, Gesamtb. Kakteen 550. 18098. 
Mammillaria rhodantha ruberrima Schumann, Gesamtb. Kakteen 550. 18098. 
Mammillaria rhodantha pyramidalis Schumann, Gesamtb. Kakteen 550. 1898. 
Mammillaria rhodantha callaena Schumann, Gesamtb. Kakteen 550. 1898. 
Mammillaria rhodantha crassispina Schumann, Gesamtb. Kakteen 550. 1898. 
Mammillaria rhodantha droegeana Schumann, Gesamtb. Kakteen 550. 1898. 
Mammiullaria rhodantha chrysacantha Schumann, Gesamtb. Kakteen 550. 1898. 
Mammillaria rhodantha stenocephala Schumann, Gesamtb. Kakteen 550. 1898. 
Mammillaria rhodantha fuscata Schumann, Gesamtb. Kakteen 551. 1898. 
Mammillaria rhodantha odieriana Schelle, Handb. Kakteenk. 257. 1907. 
Mammillaria rhodantha fulvispina Schelle, Handb. Kakteenk. 257. 1907. 
Mammillaria rhodantha tentaculata Hortus in Schelle, Handb. Kakteenk. 2 57. 1907. 
Cylindric, 1 to 3 dm. long, erect, dull green; tubercles terete, somewhat narrowed toward the 
apex, 3 to 5 mm. long, not yielding milk when pricked; axils of tubercles sometimes bearing bristles, 
often naked; radial spines 15 to 20, white, 5 to 7 mm. long; central spines 4 to 6, reddish brown, 
straight, ascending, much stouter than the radials, 10 to 12 mm. long; flowers numerous, rose- 
colored, 12 mm. broad; inner perianth-segments linear, somewhat spreading, pointed; filaments red; 
stigma-lobes 4 or 5, rose-colored; fruit 2.5 cm. long, cylindric, lilac to red; seeds brownish. 
Type locality: Mexico. 
Distribution: Probably central Mexico. 
We have had this plant in cultivation but it has never flowered with us; however, it 
is very distinct from anything else we know. 
Mammullaria flaviceps is referred by Labouret to M. crassispina, now usually referred 
to M. rhodantha. 
Mammillaria floccigera (and its variety longispina) Forster (Handb. Cact. 254. 1846), 
as well as M. aurata and M. hybrida (Pfeiffer, Enum. Cact. 31. 1837), are given by Schu- 
mann as synonyms of M. rhodantha, but none of them was described at the places cited. 
Mammillaria erinacea Wendland is unknown to us ; it is referred to Mammillaria 
rhodantha by the Index Kewensis, but whether it was described or not we do not know. 
Mammillaria fulvispina was said by Haworth to come from Brazil, while the Index 
Kewensis refers it to Brazil and Mexico. If of this relationship, it is from Mexico. 
Mammillaria radula Scheidweiler (Férster, Handb. Cact. 208. 1846), referred by Schu- 
mann as a synonym of this species, was given by Forster as a synonym of M. ammillaria 
phaeacantha. 
Mammillaria pyramidalis Link and Otto (Verh. Ver. Beférd. Gartenb. 6: 429. 1830), 
given as a synonym of this species by Schumann, is only a name. 
Mamamillaria atrata Mackie (Curtis’s Bot. Mag. 65: pl. 3642. 1839) is also referred here 
by Schumann. The plant is supposed to have come from Chile and is probably referable 
to Neoporteria, which see (Cactaceae 3: 97. 1922). 
