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This form has excellent performance in noise elimination; The second, the smear feather at the end of wings are spiciform and have no regular arrangement; the third one, the soft feather on owl's wings can absorb surplus sound whose rate was over 2000 Hz.
In such cases, when the florescence consists of solitary flowers arranged along an axis, the FU is either a spike (or spiciform inflorescence) or a raceme.
In these cases, the FU consists of a complex branching system with a main axis and branches; it is a paniculiform inflorescence with spiciform or racemose branches, depicted as a branched spike (Townsend, 1993), a panicle (Standley, 1917; Eliasson, 1987; Robertson, 1981), a paniculiform complex inflorescence (Borsch, 2001) or a synflorescence of racemes (Sanchez-del Pino & Flores Olivera, 2006).
The combination of a spiciform inflorescence with a fragile rachis, bearing verticils of 4-6 spikelets, the spikelets with single unisexual flowers, the pistillate ones disarticulating below the glumes, along with a set of other unifying features, is good evidence that Parianeae represent a natural group (Clayton & Renvoize, 1986; Hollowell, 1987).