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1(54
that 011 Ihe Swedish mainland, one of the eauses being the long
and mild autumns enjoyed bv the island.
It may also deserve to be pointed out that J. D. Hooker, in
bis work „The Student’s Flora of the British Islands"
(London, 1884, page 123), states that the flowering-period of P.
fruticosa is only „June—July".
*
The greatest interest with regard to P. fruticosa is attaehed to
its charader as dioecious. I shall here give a short description of
the different kinds of flowers I have observed, and also state the
result of the Statistical investigations I have undertaken for the
purpose of discovering the proportion existing between the different
kinds of flowers.
In the cf-flowers, the stamens are well developed and the
pistils highlv rudimentary, or entirely wanting (see fig. 4). In the
Q-flowers, the pistils are well developed, although they are
some-times only few in number, and the stamens are möre or less
rudimentary, but are never entirely absent (see lig. 5). I have
distin-guished the following four kinds of flowers, based upon the varying
degree of the reduction of the stamens and the pistils:
1) The stamens well developed; the pistils few and sterile or
none; the gynophore with a bunch of hairs (= a less strongly
con-firmed cf-llower, given in the table as cf2).
2) The stamens well developed; the pistils and the bunch of
hairs of the gynophore altogether wanting (= a most confirmed
cf-flower, given in the table as cf 3).
3) The pistils well developed, although sometimes few, the stamens
large but sterile (= a less strongly confirmed Q-flower, given in
the table as 92; see lig. 5 a).
4) The pistils well developed, although sometimes few; the stamens
small and sterile (= a möre strongly confirmed Q-llower, given in
the table as Q 3; see lig. 5 b).
Ön the examination of 5,110 bushes from 24 different colonies,
it proved, that 1,895 of them, or 37,08 %, were cf-individuals, and
that 3,215, or 62,92 were Q-individunls. Of these 5,110 bushes
I made a doser examination of 3,210 from 9 of the colonies, for
the purpose of discovering the proportion existing between the four
stages of development I have defined above. I found that 25, or
0,8 belonged to cf2; that 1,166, or 36,3 %", belonged to the cf 3
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