Stems 10-30 cm tall, 0.5-1 mm in diam. Leaves narrowly linear or linear, 1-2 cm × ca. 0.5 mm; sheath 1-1.5 mm; auricles rounded, minutely serrulate with 5-8 teeth on upper side; leaf margin minutely serrulate with 4-16 (or more) spiny teeth on each side. Plants monoecious; flowers solitary. Male flowers 0.5-1.5 mm; spathe with a short neck, with 4 or 5 brownish spine cells at apex; anther 4-thecous. Female flowers recurved, with a spathe; neck of spathe with brownish spine cells at apex; style ca. 0.5 mm; stigmas 2-lobed. Fruit semilunate, 1-2 × ca. 0.5 mm. Seeds curved, fusiform, with many rows of pits; areoles oblong. Fl. and fr. Jul-Oct. 2n = 12*, 24.
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