122 THE CACTACEAE. 



Mammillaria rhodantha sulphurea Salm-Dyck, Cact. Hort. Dyck. 1849. 11. 1850. 

 Manimillaria rhodantha ruficeps Salm-Dyck, Cact. Hort. Dyck. 1849. 11. 1850. 

 Mammillaria chry sacantha fuscata Sa\m-T>yck, Cact. Hort. Dyck. 1849. 12. 1850. 

 Mammillaria rhodantha rubescens SaXm-Hyck, Cact. Hort. Dyck. 1849. 97. 1850. 

 Mammillaria odieriana rigidior Salm-Dyck, Cact. Hort. Dj'ck. 1849. 98. 1850. 

 Mammillaria lanifera Salm-Dyck, Cact. Hort. Dyck. 1849. 98. 1850. Not Haworth, 1824. 

 ? Mammillaria riissea Dietrich, Allg. Gartenz. 19: 347. 1851. 

 Mammillaria odieriana rubra Sencke in Forster, Handb. Cact. ed. 2, 295. 1885. 

 Mammillaria odieriana cristata Hortus in Forster, Handb. Cact. ed. 2. 295. 1885. 

 Mammillaria tentaculata picta Forster, Handb. Cact. ed. 2. 309. 1885. 

 Mammillaria crassispina rufa Riimpler in Forster, Handb. Cact. ed, 2. 311. 1885. 

 Cactus chrysacanthiis Kuntze, Rev. Gen. PI. i: 260. 1891. 

 Cactus crassispinus Kuntze, Rev. Gen. PI. i: 260. 1891. 

 Cactus fuscatus Kuntze, Rev. Gen. PI. i: 260. 1891. 

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

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

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

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

 Cactus stenocephalus Kuntze, Rev. Gen. PI. 1: 261. 1891. 

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

 Cactus tentaculatus Kuntze, Rev. Gen. PI. i: 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 pfeifferi Schumann, Gesamtb. Kakteen 550. 1898. 

 Mammillaria rhodantha rubra Schumann, Gesamtb. Kakteen 550. 1898. 

 Mammillaria rhodantha ruberrima Schumann, Gesamtb. Kakteen 550. 1898. 

 Mammillaria rhodantha pyramidalis Schiunann, 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. 

 Mammillaria 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. 257. 1907. 



Cylindric, i 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. 



Mammillaria flaviceps is reierredhj l,ahouTet to M. crassispina, now usually referred 

 to M. rhodantha. 



Mammillaria flocciger a (and its variety longispina) Forster (Handb. Cact. 254. 1846), 

 as well as M. aurata and M. hybrida (Pfeiflfer, 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 (Forster, Handb. Cact. 208. 1846), referred by Schu- 

 mann as a synonym of this species, was given by Forster as a synonym of Mammillaria 

 phaeacantha. 



Mammillaria pyramidalis Link and Otto (Verh. Ver. Beford. Gartenb. 6: 429. 1830), 

 given as a synonym of this species by Schumann, is only a name. 



Mammillaria atrata Mackie (Curtis's Bot. Mag. 65: pi. 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). 



