STRUCTURE OF MONOCOTYLEDONOUS STEMS 187 
Structure of Monocotyledonous Stems 
The most useful of the Monocotyledons are the Grasses of 
which the Bamboos are the largest representatives. The Lilies, 
Asparagus, and Palms are some other Monocotyledons that are 
familiar. Nearly all Monocotyledons are herbaceous, although 
there are a few, notably the Palms and Bamboos, that are woody. 
The characteristic arrangement of the tissues of monocotyle- 
donous stems, as they appear to the naked eye, can be seen in the 
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Fic. 165. — Cross section of a Corn stem. a, rind; »v, vascular 
bundles; p, pith; e, epidermis. 
cross section of a Corn stem, as shown in Figure 165. In this sec- 
tion three features are prominent. First, there is the rind-like 
portion, forming the outer region of the stem and affording pro- 
tection and strength. The cells of this outer region contain 
chlorophyll and also function to some extent like leaves in the 
manufacture of food. Second, there is the pith, left white in our 
drawing and filling the entire cavity within the rind. Third, there 
are the vascular bundles (shown by dots) which, although scattered 
throughout the pith, are more numerous near the rind, thus tend- 
ing to form a hollow column, which, as previously pointed out, is 
the best arrangement for strength. In monocotyledonous stems 
the tissues are run together and consequently are not so grouped 
