The Rate of Revolution of various Twining Plants.

(ACOTYLEDONS.)

Lygodium scandens (Polypodiaceae) moves against the sun.

                                      H.  M.
June 18, 1st circle was made in       6   0
     18, 2nd                          6  15 (late in evening)
     19, 3rd                          5  32 (very hot day)
     19, 4th                          5   0 (very hot day)
     20, 5th                          6   0

Lygodium articulatum moves against the sun.

                                      H.  M.
July 19, 1st circle was made in      16  30 (shoot very young)
     20, 2nd                         15   0
     21, 3rd                          8   0
     22, 4th                         10  30

(MONOCOTYLEDONS.)

Ruscus androgynus (Liliaceae), placed in the hot-house, moves against the sun.

                                      H.  M.
May 24, 1st circle was made in        6   14 (shoot very young)
    25, 2nd                           2   21
    25, 3rd                           3   37
    25, 4th                           3   22
    26, 5th                           2   50
    27, 6th                           3   52
    27, 7th                           4   11

Asparagus (unnamed species from Kew) (Liliaceae) moves against the sun, placed in hothouse.

                                      H.  M.
Dec. 26, 1st circle was made in       5    0
     27, 2nd                          5   40

Tamus communis (Dioscoreaceae). A young shoot from a tuber in a pot placed in the greenhouse: follows the sun.

                                      H.  M.
July, 7, 1st circle was made in       3   10
      7, 2nd                          2   38
      8, 3rd                          3    5
      8, 4th                          2   56
      8, 5th                          2   30
      8, 6th                          2   30

Lapagerea rosea (Philesiaceae), in greenhouse, follows the sun.

                                      H.  M.
March 9, 1st circle was made in      26   15 (shoot young)
     10, semicircle                   8   15
     11, 2nd circle                  11    0
     12, 3rd                         15   30
     13, 4th                         14   15
     16, 5th                          8   40

when placed in the hothouse; but the next day the shoot remained stationary.

Roxburghia viridiflora (Roxburghiaceae) moves against the sun; it completed a circle in about 24 hours.

(DICOTYLEDONS.)

Humulus Lupulus (Urticaceae) follows the sun. The plant was kept in a room during warm weather.

                                      H.  M.
April 9, 2 circles were made in       4   16
Aug. 13, 3rd circle was               2    0
     14, 4th                          2   20
     14, 5th                          2   16
     14, 6th                          2    2
     14, 7th                          2    0
     14, 8th                          2    4

With the Hop a semicircle was performed, in travelling from the light, in 1 hr. 33 m.; in travelling to the light, in 1 hr. 13 m.; difference of rate, 20 m.

Akebia quinata (Lardizabalaceae), placed in hothouse, moves against the sun.

                                      H.  M.
March 17, 1st circle was made in      4    0 (shoot young)
      18, 2nd                         1   40
      18, 3rd                         1   30
      19, 4th                         1   45

Stauntonia latifolia (Lardizabalaceae), placed in hothouse, moves against the sun.

                                      H.   M.
March 28, 1st circle was made in      3   30
      29, 2nd                         3   45

Sphaerostemma marmoratum (Schizandraceae) follows the sun.

                                           H.  M.
August 5th, 1st circle was made in about   24   0
       5th, 2nd circle was made in         18  30

Stephania rotunda (Menispermaceae) moves against the sun

                                           H.  M.
May 27, 1st circle was made in             5    5
     30, 2nd                               7    6
June 2, 3rd                                5   15
     3, 4th                                6   28

The Movements and Habits of Climbing Plants Page 10

Charles Darwin

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