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I call it a puff if it looks soft and puffy, like an elongate Q-tip that completely conceals the stem. Some puffy grasses have longer puffs shaped more like a Fourth of July sparkler. The spikelets ("seeds") are often so tiny that you cannot tell whether it is a spike or not. So just call it a Puff. Sometimes puffs look spiny or jagged, but these might still feel soft. Except for Fountaingrass, I don't include huge grasses with foot-long and inches-wide plumes (such as Common Reed) as puffs.
