nyctitropic

Associated word: nyctitropic. sleepwalker, n. somnambulist, noctambulist, somnambulator, somnambule. sleepwalking, n. somnambulism, somnambulation, somnambulance, noctambulism, noctambulation.

There is another difference between the two sets of cases, namely, that there is never, or very rarely, any torsion of the leaves, excepting when a pulvinus is present;* but this statement applies only to periodic and nyctitropic movements as may be inferred from other cases given by Frank.**

We think that the movement in this case may be called nyctitropic, though the angle passed through was small.

Nyctitropism and nyctitropic, i.e. night-turning, may be applied both to leaves and flowers, and will be occasionally used by us; but it would be best to confine the term to leaves.

With T. subterraneum, leucanthemum and strictum, they stood up vertically; and with T. strictum the rising movement is accompanied, as we shall see, by another movement, which makes us believe that the rising is truly nyctitropic.