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Trifolium repens.--A stem was secured close to the base of a moderately old
leaf, and the movement of the terminal leaflet was observed during two
days. This case is interesting solely from the simplicity of the movements,
in contrast with those of the two preceding species. On the first day the
leaflet fell between 8 A.M. and 3 P.M., and on the second between 7 A.M.
and 1 P.M. On both days the descending course was somewhat zigzag, and this
evidently represents the circumnutating movement of the two previous
species during the middle of the day. After 1 P.M., Oct. 1st (Fig. 144),
the leaflet began to rise, but the movement was slow on both days, both
before and after this hour, until 4 P.M. The rapid evening and nocturnal
rise then commenced. Thus in this species the course during 24 h. consists
of a single great ellipse; in T. resupinatum of two ellipses, one of which
includes the nocturnal movement and is much elongated; and in T.
subterraneum of three ellipses, of which the nocturnal one is likewise of
great length.
Securigera coronilla (Tribe 4).


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