28 BOTANICAL, GAZETTE | JANUARY 
of two sizes, both constituting a single band, the larger situated 
in the same radius as the collenchymatic ridges, the smaller in 
alternation with them within the cortex. The leptome forms 
quite a large oval or roundish group in both kinds of bundles, 
all of which are collateral; and the hadrome is composed of 
very wide reticulated vessels which form a continuous arch in 
the smaller bundles, sometimes in the shape of a V. In the 
larger mestome bundles the arch is less complete, and here a 
small lacune with remains of an annular vessel was observed. 
This structure of the mestome bundles suggests what is known 
among other orders of monocotyledons, especially the larger 
ones. Finally, the pith, which occupies the inner portion of the 
central cyclinder, is solid, not hollow, but the cell walls are very 
thin, and no deposits were observed. 
The base and apex of the scape show the same arrangement 
and relative development of the various tissues, but no stomata 
or hairs were observed on the part enclosed by the tubular leaf 
sheath. It might be stated, also, that although the mestome 
bundles were noticed to be strictly collateral in a large number 
of sections, one instance was found in which a few (three) nar- 
row scalariform vessels were situated outside the leptome, this 
mestome bundle being thus approximately perihadromatic. It 
was only in one bundle, however, and very near the inflorescence. 
The structure of the bundles, therefore, does not seem to be invari- 
ably identical throughout the whole length of the stem. It must 
be remembered, also, that in the rhizome the bicollateral bundles 
within the endodermis pass gradually over into collateral when 
they enter the cortical parenchyma, whence they proceed to the 
leaves, in which they are constantly and strictly collateral. 
THE LEAF. 
The proper leaves are linear, nearly flat or with the margins : 
somewhat. involute, and have no sheath. They form a dense 
rosette at the apex of the rhizome, and in their axils the flower 
bearing scapes develop on very short one leaved shoots, while 
the terminal bud of the rhizome itself is purely vegetative. In 



