Erdisia meyenii nom nov

Cereus aureus Meyen, Allg. Gartenz. 1: 211. 1833. Not Salm-Dyck, 1828.

Cactus aureus Meyen, Reise 1: 447. 1834.

Echinocactus aureus Meyen in Pfeiffer, Enum. Cact. 68. 1837.

Cleistocactus aureus Weber in Gosselin, Bull. Mens. Soc. Nice 44: 39. 1904.

Stems subterranean, often forming large colonies sending up short, usually unjointed branches; joints 10 to 20 cm. long, 3 to 5 cm. in diameter, more or less clavate; ribs 5 to 8, high (1 cm. high

Fig. 155.—Erdisia squarrosa.

or more), somewhat undulate; spines several, subulate, unequal, brown to blackish, the longest 5 to 6 cm. long; flowers small, about 4 cm. long, yellow; scales on ovary and flower-tube small, 3 to 4 mm. long, acute, bearing felt and spines in their axils; fruit 2 cm. in diameter, reddish.

Type locality: Cordilleras de Tacna, Chile (formerly Peru), 600 meters altitude.

Distribution: Northern Chile and near Arequipa, Peru.

Dr. Rose found this plant (No. 18801) very common on the dry hills just below Arequipa, Peru, growing mostly underground. The separated branches at first seemed to represent distinct plants; it is inconspicuous, its purple stems with black spines resembling a dead plant.

Meyen's Travels is usually cited as the original place of publication for this species, but it was published a year earlier as Cereus aureus. This last combination has usually been credited to Schumann (Gesamtb. Kakteen 124. 1897). ThThe name assigned to this plant being a homonym, we have renamed it for its discoverer, Franz Julius Ferdinand Meyen (1804-1840), a celebrated traveler and writer.

Figure 156 shows a branch collected by Dr. Rose near Arequipa, Peru, in 1914.

Fig. 156.—Branch of E. meyenii. X0.5. Fig. 157.—Erdisia spiniflora.

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