Opuntia mieckleyi K Schumann 1903

Plants shrubby, low growing with erect stems. Stem segments narrowly oblong, dark green, 15-25 cm (5.9-9.8 in) long, 46 cm (1.6-2.4 in) wide. Areoles dark. Spines 1-2, often absent, dark. Flowers orange to brick red, to 6 cm (2.4 in) in diameter. Distribution: Paraguay. Little is known of Opuntia mieckleyi.

Opuntia monacantha (Willdenow) Haworth 1819 Cactus monacantte Willdenow 1813 Opuntia arechavaletae Spegazzini 1905

Opuntia vulgaris of various authors, misapplied, not P. Miller 1768; see under 0. ficus-indica Platyopuntia brunneogemmia F. Ritter 1979, Opuntia brunneogemmia (F. Ritter) Schlindwein 1995,0. monacantha subsp. brunneogemmia (F. Ritter) P. J. Braun & Esteves 1995

Plants nearly treelike with several branches, to 2 m (6.6 ft) high. Stem segments oval to elongated, narrowing basally, glossy green, fairly thin, 10-30 cm (3.9-12 in) long. Areoles widely separated. Glochids brownish. Spine usually one, sometimes 2-3, straight, brown, 3-4 cm (1.2-1.6 in) long. Flowers deep yellow, to 8 cm (3.1 in) in diameter. Fruits pear shaped, red, spineless, to 7 cm (2.8 in) long. Distribution: widespread, in Brazil, Paraguay, Uruguay, and Argentina.

Opuntia microdasys

Opuntia nuda 509

Two subspecies of Opuntia monacantha are recognized. Subspecies monacantha is found throughout the range of the species. Subspecies brunneogemmia tends to have smaller stem segments; it occurs in Rio Grande do Sul, Brazil.

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