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1 Ocreae reflexed bristly at the base; perianth white; achene glossy black; [of high elevation openings and woodlands]
..2 Plant woody; inflorescences freely branched, strongly paniculate; [sometimes cultivated, apparently naturalizing]; [section Sarmentosae]
....3 Achene dull black; outer sepals keeled, not expanding into obvious wings in fruit, the fruit therefore 3.5-4.5 mm long (measured from the pedicel joint to the tip); [weedy annual]
......4 Fruiting perianth wings usually truncate to attenuate-decurrent on stipelike base, flat, or (less often) undulate or crinkled, margins entire (rarely undulate-crenate)
......4 Fruiting perianth wings decurrent on stipelike base, undulate or crinkled, rarely flat, margins wavy-crenulate to incised or lacerate (rarely entire)