"Stems cylindric to globose, solitary or forming clumps, not jointed, covered with cylindric to conic tubercles, each of these with a terminal areole bearing radial and usually also central spines but lacking glochids; fls arising individually on new growth of the season at the base of an adaxial groove descending from the areole; hypanthium funnelform- prolonged above the ovary; fr thin-walled, fleshy; seeds small, dark, wingless. 30+, N. Amer."
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