Some of the numerous _Juncus_-species (_e.g. J. effusus_,
_glaucus_, _conglomeratus_, etc.), have false, lateral
inflorescences, the axis of the inflorescence being pushed
to one side by its subtending leaf, which apparently forms
a direct continuation of the stem, and resembles it both
in external and internal structure. The foliage-leaves of
this genus were formerly described as “unfertile stems,”
because they are cylindrical, erect, and resemble stems, and
consequently the stem was said to be “leafless”: _J. effusus_,
_glaucus_, _conglomeratus_. Stellate parenchynatous cells are
found in the pith of these stems and in the leaves. Other
species have distinct terminal inflorescences and grooved
leaves; _J. bufonius_ (Toad-rush), _compressus_, and others.
The _inflorescences_ most often present the peculiarity of
having the lateral axes protruding above the main axis.
Their composition is as follows:--The flowers have either no
bracteoles, and the inflorescences are then capitulate; or
they have 1–several bracteoles. Each branch has then, first,
a 2-keeled fore-leaf placed posteriorly (“basal-leaf”), and
succeeding this are generally several leaves borne alternately
and in the same plane as the basal-leaf, the two uppermost
(the “spathe-leaves”) being always barren; those which lie
between the basal-leaves and the spathe-leaves are termed
“intermediate-leaves.” If only branches occur in the axils
of the basal-leaves, then the succeeding branches are always
borne on the posterior side of the axis, and form a fan[27];
if the basal-leaf is barren, and if there is only one fertile
intermediate-leaf, then the lateral axes are always on the upper
side, and a sickle[27]-like inflorescence occurs; if there are 2
fertile intermediate-leaves, then a dichasium is formed, and in
the case of there being several, then a raceme, or spike.
_Juncaceæ_ are, by several authors, classed among the
Liliifloræ, but there are so many morphological and partly
anatomical features agreeing with the two following orders, that
they may, no doubt, most properly be regarded as the starting
point of these, especially of the _Cyperaceæ_, which they
resemble in the type of flowers, the inflorescence, the type of
mechanical system, and the stomata.
POLLINATION by means of the wind. Cross-pollination is
often established by protogyny. _J. bufonius_ has partly
triandrous and cleistogamic, partly hexandrous, open
flowers.--DISTRIBUTION. The 200 species are spread over the
entire globe, but especially in cold and temperate countries;
they are seldom found in the Tropics.--USES. Very slight;
plaiting, for instance.
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