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Some authorities recognize Setaria verticillata and Setaria adhaerens as one species while others recognize them as two. The more temperate S. verticillata has ciliate sheath-margins, glabrous blades and spikelets over 2 mm long. The more tropical S. adhaerens has glabrous sheath-margins, hairy blades and spikelets under 2 mm long. However, these are only two among a number of intergrading populations, and some recommend treating the whole complex as a single polymorphic species