setaria

These differentiations are shown in a striking manner by certain Paniceae, Setaria for example.

But in Setaria we meet with certain characteristics of reaction which are quite inexplicable.

That the motile organ in Setaria is totally devoid of perception, since direct action of light induces no effect.

Hence considerable doubt may be entertained as regards the supposed absence of perception in the hypocotyl of Setaria.