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
The increased number of stamens in a single whorl may result from a
development of organs usually suppressed, and constitute a form of
regular peloria as in _Linaria_, wherein a fifth stamen is occasionally
met with. Among normally didynamous plants such numerical restitution,
so to speak, is not unusual; thus, in _Veronica_ four and five stamens
occur. Fresenius has seen five stamens in _Lamium_, _Mentha_,
_Chelone_;[402] Bentham in _Melittis_, and other instances are cited
under the head of peloria. Chorisis may also serve to account for some
of these cases; thus, Eichler[403] figures a flower of _Matthiola annua_
with five long stamens instead of four; one of the long pairs of stamens
has here undergone a greater degree of repetition than usual. De
Candolle[404] cites and figures a curious form of _Capsella
Bursa-pastoris_ sent him by Jacquin, and which was to some extent
reproduced by seed. In the flowers of this variety there were no petals,
but ten stamens; hence De Candolle inferred that the petals were here
replaced by stamens, but Moquin[405] objects, and with justice, to this
view, as the ten stamens are all on the same line; he considers the
additional stamens to be the result of chorisis. Buchenau[406] mentions
the presence of seven stamens in another Crucifer, _Ionopsidium
acaule_. Here the supernumerary organ was placed between two of the long
stamens. The effect of chorisis in producing an augmentation of parts is
well seen in some plants that have some of their flowers provided with
staminodes or abortive stamens, and others with clusters or phalanges of
perfect stamens. Thus, in the female flowers of _Liquidambar_ there are
five small staminodes without anthers, whereas in the male flower the
stamens are numerous and grouped together in phalanges, so that the
relation of simple to compound stamens is in this case readily seen, as
also in many _Malvaceae_, _Sterculiaceae_, _Byttneriaceae_, _Tiliaceae_, and
_Myrtaceae_. It is probably the idea of splitting or dilamination
involved in the word chorisis that has led many English botanists to
hesitate about accepting the notion. Had they looked upon the process as
identical with that by which a branched inflorescence replaces an
unbranched one, or a compound leaf takes the place of a simple one, the
objections would not have been raised with such force. The process
consists, in most cases, not so much in actual cleavage of a
pre-existing organ as in the development of new-growing points from the
old ones.
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