238 THE CACTACEAE. 



Melocactus leopoldii Gard. Chron. II. 5: 603. 1876. 



The only information regarding this plant which we have is an account of an Inter- 

 national Exhibition at Brussels in 1876 in which it was awarded a prize with this com- 

 ment : The third prize was given to M. de Smet for Melocactus leopoldii, a globular plant 

 with very numerous spines of reddish hue, paler at base, the largest ones 2.5 inches long. 



Melocactus lEucaster Hoffmannsegg, Preiss. Ver. ed. 7. 22. 1833. 



This species is described as having short white spines. We do not know it nor have we 

 seen the original description. Walpers thought it was a variety of Melocactus communis. 



Melocactus octogonus Forbes, Journ. Hort. Tour Germ. 151. 1S37. 



This plant came from Mexico in 1834 and can not now be definitely identified but it 

 probably is not of this genus. The original description says it has 8 remote ribs and 8 to 

 10 brownish yellow spines. The name occurs also in vSweet's Hortus Britannicus (ed. 3. 

 282. 1839). It is probably different from Cactus octogonus which Steudel refers as a synonym 

 of Cereus hexagonus. 



Cactus aculeatissimus Zeph (Steudel, Nom. 131. 1 821) is only a name. 



Cactus aurantiiformis Thiery, catalogued in both editions of Steudel (Nom. 131. 1821 ; 

 ed. 2. 1 : 245. 1840) and also catalogued by the Index Kewensis, was without synonymy and 

 so far as we know has never been described. 



Cactus luteus Thiery (Steudel, Nom. 132. 1821; ed. 2. 1: 246. 1840) is only a name 

 which Steudel himself questioned. 



Cactus mensarum Thiery (Steudel, Nom. ed. 2. 1 : 246. 1S40) is only a name. 



Cactus proteiformis Desfontaines (Tabl. Bot. ed. 3. 276. 1829; Cereus protcijormis 

 Steudel, Nom. ed. 2. 1 : 246. 1840) can not be identified. 



Cactus pseudotuna (Steudel, Nom. ed. 2. 1 : 246. 1840) was said to be Opuntia pseudo- 

 tuna, a very doubtful plant. 



Cactus sylvestris Thiery (Steudel, Nom. 132. 1821 ; ed. 2. 1 : 246. 1840) is only a name. 



Cactus trichotomus Tenore (Steudel, Nom. ed. 2. 1 : 246. 1840) is only a name. 



Cactus verticillatus Brotero (Heynhold, Nom. 2: 103. 1846) is only a name. 



Melocactus atrovircns Hortus (Forster, Handb. Cact. 279. 1846) is only a name. 



Melocactus coronatus Cels (Forster, Handb. Cact. 279. 1846) is only a name. 



Melocactus jerox Pfeiffer (Forster, Handb. Cact. 519. 1846) which was supposed to come 

 from southern Brazil we do not know. With this is also referred Echinocactus armatus 

 Salm-Dyck (Pfeiffer, Enum. Cact. 61. 1837) and Echinocactus spina-christi Zuccarini 

 (Pfeiffer, Enum. Cact. 59. 1837) and to the latter Pfeiffer refers Echinocactus fischeri as a 

 synonym and Forster gives Melocactus spina-christi Cels (Handb. Cact. 279. 1846) as 

 simply a name. 



Melocactus fluminensis Poselger (Monatsschr. Kakteenk. 2: 50. 1892; 3: 68. 1893) 

 is only a name. 



Melocactus hooker ianus Forbes (Forster, Handb. Cact. 279. 1846) is only a name. 



Melocactus nigro-tomentosus (Monatsschr. Kakteenk. 3: 1. 1893), Melocactus lobelii 

 (Monatsschr. Kakteenk. 6: 142. 1896), illustrated (Verh. Kon. Akad. Wetensch. II. 5 3 : pi. 

 1. f. 1, 1, a, 1, b), M. communijormis (Monatsschr. Kakteenk. 8:31. 1898) and Melo- 

 cactus rcpens (Monatsschr. Kakteenk. 18: 167. 1908) seem never to have been described. 



