238 THE CACTACEAE. 
MELOCACTUS LEOPOLDIL 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. 1837. 
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 Sweet’s Hortus Britannicus (ed. 3. 
282. 1839). Itis probably different from Cactus octogonus which Steudel refers as a synonym 
of Cereus hexagonus. 
Cactus aculeatissimus Zeph (Steudel, Nom. 1 31. 1821) 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. 1840) is only a name. 
Cactus proteiformis Desfontaines (Tabl. Bot. ed. 3. 276. 1829; Cereus protetformis 
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. 1 32. 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 atrovirens Hortus (Forster, Handb. Cact. 279. 1846) is only a name. 
Melocactus coronatus Cels (Forster, Handb. Cact. 279. 1846) is only a name. 
Melocactus ferox 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. 6r. 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 hookerianus 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. IT. 5?: pl. 
1. f. 1, 1, a, 1, b), M. communtformis (Monatsschr. Kakteenk. 8: 31. 1898) and Melo- 
cactus repens (Monatsschr. Kakteenk. 18: 167. 1908) seem never to have been described. 
