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Botaniska Notiser 1947, Häfte 3. Lund
Bidrag till Skånes Flora.
37. Distribution and ecology of Quercus petraea.
By H. Weimarck.
(Meddelanden från Lunds Botaniska Museum, \:r 8(5.)
1. Introduction. In l\vo earlier papers in this journal (Weimarck
1947 a and 1947 b) I have treated the taxonomy and distribution of the
North European oaks. It was shown that Quercus Robur L. comprises
two different types in North Europe, viz. Q. Robur ’’’pedunculata DC.,
with no stellate hairs, and Q. Robur *puberula (Lasch) Weim., with
stellate hairs on the lower surface of the leaves. The latter subspecies
has a markedly eastern distribution area, a feature which has also
been pointed out by Schwarz (1937). Q. petraea as a species is well
differentiated from the form sphere of Q. Robur.
The sessile oak varies less with regard to morphological features
than does the pedunculate oak.
Q. petraeaXRobur constitutes a series very rich in forms, the
members of which are pronouncedly sterile. In places where the two oaks
grow together hybrids are common, less common, however, than is
usually presumed: a large part of the material earlier classified as
hybrids represents instead Q. Robur *puberula. One of the reasons for
the hybrids nevertheless being relatively common is to be found in the
pronounced allogamy of the Quercus-species (Dengler 1941).
The hybrids are, as a rule, more or less beautifully intermediate
between the parents, but forms occur which deviate very much from
the common types. This is especially true of the oaks with entire leaves
[Q. pet raeaX. Robur, f. mespilifolia (Wallr.) Weim.]. These oaks as
well as several deviating forms with unusually deeply lobed leaves have
been referred to one or other of the two species by earlier authors. The
hybrids have the same distribution as has Q. petraea, but occasional
localities are known outside of the area of this species. — For further
particulars see Weimarck 1947 b.
14 Botaniska Xotiser 19t7.
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