Vegetable Teratology: An Account of the Principal Deviations from the Usual Construction of PlantsMasters, Maxwell T. (Maxwell Tylden)
Science
Vegetable Teratology: An Account of the Principal Deviations from the Usual Construction of Plants
Masters, Maxwell T. (Maxwell Tylden)
Plants -- Abnormalities
[Illustration: FIG. 53.--Lateral prolification in inflorescence of
_Pelargonium_.]
It is common in the _Anemone coronaria_ and _hortensis_, also in the
common scarlet _Pelargonium_ (fig. 53). It has been frequently recorded
in _Poterium sanguisorba_, and in _Sanguisorba officinalis_, and is
especially common in _Umbelliferae_, _Dipsacaceae_, and _Compositae_; a
familiar illustration in the latter order is afforded by the
hen-and-chicken daisy. In some species of Compositae, indeed, it is a
normal and constant occurrence, while in other cases, such as _Filago
germanica_, usually described as proliferous, there is not, strictly
speaking, any prolification, for the branching of the stalk takes place
below the inflorescence, and the branches originate from the axils of
ordinary leaves, not from the floral leaves or bracts. _Convolvulus
Sepium_ is very commonly subject to the production of flower-buds from
the axils of the floral leaves. The several species of Plantain
(_Plantago_) seem very liable to this and similar changes.
Schlechtendal[115] gives a summary of the various kinds of malformation
affecting the inflorescence in _Plantago_, and divides them into five
groups, as follows:--1st, bracteate, wherein the inferior bracts are
quite leaf-like, as is frequently seen in _Plantago major_. 2nd,
roseate; bracts leafy in tufts or rosettes, without flowers, as in the
so-called rose plantain, common in old-fashioned gardens in this
country. 3rd, polystachyate; spike-branched, bearing other spikes in the
axils of the bracts, as in _P. lanceolata_, _P. maritima_, &c. 4th,
proliferous, where the flower-stalk bears a rosette, a spike, or a head
with other rosettes. 5th, paniculate, in which the inflorescence has
become a much-branched pyramidal panicle, covered with little bracts,
and with very rudimentary flowers.[116] The first two groups belong
rather to frondescence of the bracts; but with regard to the whole of
them it will easily be surmised that intermediate forms occur, linking
one group to the other, and defying exact allocation in either. Thus, in
the borders of richly cultivated fields in the neighbourhood of London I
have frequently gathered specimens of _Plantago major_ with a branched
spike provided with large leafy bracts, the branches of the spike being
but little less in diameter than the ordinary single spike. These
specimens would therefore seem to be intermediate between
Schlechtendal's bracteate and polystachyate divisions. Wigand[117] also
describes an anomalous specimen of _Plantago major_ similar to those
just mentioned, but having small lateral spikes in place of large ones.
The instance quoted from Professor Braun would fall under the roseate
section, as would also that of Kirschleger, though we are expressly told
that the tuft of leaves in this last case was not developed until after
the ripening of the seed-vessel. One of the characters of the roseate
group, according to Schlechtendal, is the absence of flowers, but most
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