Polygonum aviculare (Polygoneae).--Professor Batalin informs us that the
young leaves rise up vertically at night. This is likewise the case,
according to Linnaeus, with several species of Amaranthus (Amaranthaceae);
and we observed a sleep movement of this kind in one member of the genus.
Again, with Chenopodium album (Chenopodieae), the upper young leaves of
some seedlings, about 4 inches in height, were horizontal or sub-horizontal
during the day, and at 10 P.M. on March 7th were quite, or almost quite,
vertical. Other seedlings raised in the greenhouse during the winter (Jan.
28th) were observed day and night, and no difference could be perceived in
the position of their leaves. According to Bouch? ('Bot. Zeitung,' 1874, p.
359) the leaves of Pimelia linoides and spectabilis (Thymeleae) sleep at
night.
[page 388]
Euphorbia jacquiniaeflora (Euphorbiaceae).--Mr. Lynch called our attention
to the fact that the young leaves of this plant sleep by depending
vertically. The third leaf from the summit (March 11th) was inclined during
the day 30o beneath the horizon, and at night hung vertically down, as did
some of the still younger leaves.
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