sampled, a very handy and accessible feature is the pith
of the branchlets. About half of the dry country mallees have a
line of brown oil glands in the pith
usually visible to the naked eye, while the remainder have a white
or uniformly coloured, undifferentiated pith. This character
is easily assessed in the field by pulling
a side branchlet away from the main axis. Pith glands, if present,
will be most conspicuous at the nodes so this is where the character
should be sought for its presence or absence. The character does
not apply to any species of the eastern tablelands and mountains.
These do not have glands in the pith.
Pith gland absence or presence is a character of high though not
absolute reliability and is a particularly useful character to help
identify South Australian and Western Australian species.
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