Opuntia stenarthra K Schumann 1899

Plants shrubby, to 80 cm (31 in) high with several prostrate to ascending branches to 2 m (6.6 ft) long. Stem segments narrowly oblong, yellowish green, thin, 8-25 cm (3.1-9.8 in) long, 2.5-7 cm (1-2.8 in) wide. Glochids brown. Spine usually absent, sometimes 1,3, or 5, yellowish brown, becoming whitish with age, 0.6-3.5 cm (0.2-1.4 in) long. Flowers lemon yellow, to 3 cm (1.2 in) long and in diameter. Fruits pear shaped, to 2.5 cm (1 in) long. Distribution: Estancia Tagatiya, Concepción department, Paraguay.

Opuntia Stenopetala Engelmann 1857 arrastradillo, nopal serrano ? Opuntia glaucescens Salm-Dyck 1834 ?Opuntia grandis Pfeiffer 1837 Opuntia arrastradillo Backeberg 1953 Opuntia marnieriana Backeberg 1953 Opuntia riviereana Backeberg 1962

Plants shrubby, low growing with creeping stems, often forming mats. Stem segments obovate to round, gray-green, sometimes with purplish tint, 10-20 cm (3.9-7.9 in) long. Leaves dark red, to 2 mm long. Areoles 1-3 cm (0.4-1.2 in) apart. Glochids abundant in young areoles, brown. Spines 2-4, dark red to black, to 5 cm (2 in) long. Flowers unisexual, reddish orange, to 3 cm (1.2 in) long. Fruits globose, to 3 cm (1.2 in) in diameter, with or without spines. Distribution: occurring widely in Mexico in Coahuila, Nuevo León, San Luis Potosí, Tamaulipas, Zacatecas, Querétaro, Hidalgo, and Guanajuato.

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