| Denis Mirin | Может в родительских видах поменять P.hypoleuca на её основное название - P.multifida? Тем более что во Флоре Сибири 2-й родитель указан именно так (в примечаниях к Potentilla argentea, из которой авторы решили гибрид не выделять, т.к. он только в присутствии обоих родителей встречается).
И ещё, пока в сборах из окрестностей Аршаново мне попались из потенциальных родителей типичная Potentilla argentea и P.tergemina (из той же секции, что multifida, различия только по одному признаку). Не может ли такой же гибрид получаться из P.argentea x P.tergemina? |
| Andriy Kovalchuk | Вот что по этому поводу пишет И. Сояк (Feddes Repertorium 120 (2009) 3–4, 185–217):
Potentilla approximata BUNGE in LEDEB. group
In southern Siberia P. argentea L. hybridizes
with three species of sect. Pensylvanicae (Multifidae)
which are somewhat similar to each other.
Derivatives of these three hybrid combinations
are sometimes difficult to distinguish. In theory,
the offspring of P. argentea × P. conferta
BUNGE in LEDEB. should have longer indumentum
of petioles and larger number of leaflets
than the offspring of other two combinations.
Derivatives of P. argentea × P. multifida
and P. argentea × P. tergemina SOJÁK
should mainly differ to one another by the length
of hairs of petioles. To check these assumptions
experimentally, I carried out all three
crossings.
Theoretical considerations were thus confirmed.
Resulting F1 hybrids were characterized
as follows: P. argentea × P. conferta had lower
cauline leaves with (2–)3 pairs of leaflets and
petioles with (1.5–)2–2.5 mm long hairs; glandular
sepals were an important character.
P. argentea × P. tergemina had lower cauline
leaves palmate or 2(–3)-paired pinnate and
petioles with 1.2–2(–2.5) mm long hairs.
P. argentea × P. multifida had lower cauline
leaves palmate and petioles had hairs
0.4–1(–1.3) mm long. Both latter combinations
had glandless sepals.
Excepting sterility, I obtained by crossing
P. argentea × P. conferta an exact copy of
P. approximata existing in nature. By crossing
P. argentea × P. tergemina I obtained a copy of
the Siberian taxon described as P. angarensis
POPOV. The type material of P. angarensis is a
form difficult to distinguish from non-hybrid
P. argentea, but I am sure it is of hybrid nature
(almost identical forms commonly occur in
central and southern Europe but in Siberia,
where P. argentea is quite homogeneous, forms
with shallowly dentate leaflets prevail and
plants with leaflets deeply divided are, in my
opinion, offspring of hybrids).
By crossing P. argentea × P. multifida I
obtained hybrids conforming with P. omissa
SOJÁK described from southern coast of Baikal
Lake. This is frequent on the outskirts of Irkutsk,
in the airport and even in the streets.
The upsurge of all hybrid species mentioned
seems to have taken place parallel with colonization
of Siberia. These species began to spread independently
of their parents and the speed of
dispersal was supported by the arterial railway.
They now extended as far as Vladivostok. Their
typical habitat is semi-cultural grasslands along
roads. |