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Perianth segments (3 or)6, in (1 or)2 whorls, free, usually greenish to brownish or blackish, rarely white or yellowish, glumelike. 花被片(3或者)6，（1-）2輪，離生，通常綠色，棕色或黑色，少數(shù)白色或黃色，穎狀。