. The Cactaceae : descriptions and illustrations of plants of the cactus family. N^OMAMMILLARI A. 133 Mammillaria depressa was credited by mistake to De Candolle by Pfeiffer in listing the synonyms of M. discolor (Enum. Cact. 28. 1837). Mammillaria confinis Haage, according to Pfeiflfer (Enum. Cact. 28. 1837), appeared in "Haage, Catal. Cact. 1836" and he lists it as a synonym of M. albida. Mammillaria canescens Hortus (Pfeiffer, Enum. Cact. 28. 1837) was given as a synonym of M. discolor. This is different from M. canescens Jacobi (Allg. Gartenz. 24: 89. 1856) which Schumaim lists a
. The Cactaceae : descriptions and illustrations of plants of the cactus family. N^OMAMMILLARI A. 133 Mammillaria depressa was credited by mistake to De Candolle by Pfeiffer in listing the synonyms of M. discolor (Enum. Cact. 28. 1837). Mammillaria confinis Haage, according to Pfeiflfer (Enum. Cact. 28. 1837), appeared in "Haage, Catal. Cact. 1836" and he lists it as a synonym of M. albida. Mammillaria canescens Hortus (Pfeiffer, Enum. Cact. 28. 1837) was given as a synonym of M. discolor. This is different from M. canescens Jacobi (Allg. Gartenz. 24: 89. 1856) which Schumaim lists among his unknown plants. (See also Lemaire, Cact. Gen. Nov. Sp. 99. 1839.) Mammillaria coniflora Hortus and M. discolor coniflora Salm-Dyck (Cact. Hort. Dyck. 1849. II. 1850) are only names which belong here. Mammillaria discolor fulvescens Salm-Dyck (Cact. Hort. Dyck. 1844. 7. 1845) was not formally published at the place here cited. Mammillaria discolor breviflora (Forster, Handb. Cact. 206. 1846), although not described at the place here cited, is usually referred here. Cactus pseudomammillaris appeared simply as a name in 1815 (Desfontaines, Tab. Bot. ed. 2. 191), and again in Pfeiffer's Enumeratio (28. 1837) as a synonym of Mammil- laria discolor prolifera. Pfeiffer credits the name to Salm-Dyck and gives the reference to Allgemeine Gartenzeitung (3: 57. 1835), but the name appeared there under Mammillaria along with spinii and canescens. M. spinii, credited to Colla, is given by Salm-Dyck (Cact. Hort. Dyck. 1849. 11. 1850) as a synonym of M. discolor. Schumann lists Mammillaria rhodacantha Salm-Dyck (Cact. Hort. Dyck 1849. 96. 1850) among his unknown species. M. rhodacantha pallidior (Salm-Dyck, Cact. Hort. Dyck. 1844. 8. 1845) is only a name, while M. discolor rhodacantha (Walpers, Repert. Bot. 2: 271. 1843), although never described, seems to be the same as M. rhodacantha. Illustrations: Mem. Mus. Hist. Nat. Paris 17: pi. 2, f. 2: Ann. Inst. Roy. Hort. Fromont 2: pi. i,
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