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; it was strongly
zigzag, and apparently
[page 383]
represented five ellipses, with their longer axes differently directed.
Albizzia lophantha (Tribe 23).--The leaflets at night come into contact
with one another, and are directed towards the apex of the pinna. The
pinnae approach one another, but remain in the same plane as during the
day; and in this respect they differ much from those of the above Schrankia
and Acacia. The main petiole rises but little. The first-formed leaf above
the cotyledons bore 11 leaflets on each side, and these slept like those on
the subsequently formed leaves; but the petiole of this first leaf was
curved downwards during the day and at night straightened itself, so that
the chord of its arc then stood 16o higher than in the day-time.
Melaleuca ericaefolia (Myrtaceae).--According to Bouch? ('Bot. Zeit.,'
1874, p. 359) the leaves sleep at night, in nearly the same manner as those
of certain species of Pimelia.
Oenothera mollissima (Onagrarieae).--According to Linnaeus ('Somnus
Plantarum'), the leaves rise up vertically at night.


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