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 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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