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M.; whilst at this same hour the leaflets of the secondary
leaves were vertically dependent. Here, then, we have the extraordinary
case of the primary and secondary leaves on the same plant moving at the
same time in opposite directions.
We have now seen that the leaflets in the six genera of Phaseoleae observed
by us (with the exception of the primary leaves of Phaseolus Roxburghii)
all sleep in the same manner, namely, by sinking vertically down. The
movements of the petioles were observed in only three of these genera. They
rose in Centrosema and Phaseolus, and sunk in Amphicarpaea.
Sophora chrysophylla (Tribe 10).--The leaflets rise at night, and are at
the same time directed towards the apex of the leaf, as in Mimosa pudica.
Caesalpinia, Hoematoxylon, Gleditschia, Poinciana.--The leaflets of two
species of Caesalpinia (Tribe 13) rose at night. With Haematoxylon
Campechianum (Tribe 13) the leaflets move forwards at night, so that their
midribs stand parallel to the petiole, and their now vertical lower
surfaces are turned outwards (Fig. 153).


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