Triglochin maritimum , L. 103 
Summary. 
Structure. 
(a) Rhizome. 
1. The endodermis is very similar to that of the roots 
of Dracaena, &c. 
2. The vascular bundles are of the concentric type, with 
the xylem surrounding the phloem and broken up into 
separate masses by passage-cells. The protoxylem is placed 
towards the centre of the axis. 
3. The course of the bundles is of the ordinary Palm-type, 
although a large number of anastomoses takes place. 
Reseaux radiciferes are formed. 
4. Cambium may be developed, which may be indicative 
of incipient secondary thickening. 
( b ) Roots. 
1. The roots are adventitious, and arise acropetally. 
2. A well-marked exodermis is formed. 
3. The vascular cylinder may be pentarch, hexarch, or 
heptarch. 
4. Each phloem-group is reduced to one sieve-tube, which 
borders directly upon the endodermis; the companion-cell 
is easily recognized. 
(c) Leaves. 
1. The vascular bundles are collateral. 
2. In the axils of the leaves gland-like bodies are developed, 
and are finally cut off by a thickening of the cells across 
the base of each. 
The glands seem to have a mucilaginous secretion. 
(d) Flowering-stem. 
1. The vascular bundles are of the collateral type, and 
when young have a structure remarkably similar to that 
of the same organs in several plants belonging to the 
Ranunculaceae. 
