Plants solitary, later forming clumps. Stems globose to short cylindrical, light green, to 10 cm (3.9 in) high and 8 cm (3.1 in) in diameter. Tubercles conical to ovoid, without latex, axils with wool. Central spines 2, sometimes one, slightly curved, needle-like, glassy white to yellowish white, with brown tips, to 9 mm (0.4 in) long. Radial spines 21-28, thin, needle-like, glassy white, 5-8 mm (0.2-0.3 in) long. Flowers funnelform, sulfur yellow with pale pink margins, to 12 mm (0.5 in) in diameter. Fruits small, whitish. Seeds brown. Distribution: near Ocotepec, Oaxaca, Mexico.
422 MammHIaria heidiae
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