| These
three genera of native shrubby daisies are superficially
similar. They all have small to very small flower heads with
only tube flowers. The heads are clustered together in
compound inflorescences that often contain many heads.
The genera can be distinguished by inflorescence
characters.
In Odixia (formerly known as Ixodia; two
species in Tasmania) the flowers have no pappus.
Cassinia (two species in Tasmania) has chaffy
scales between the individual flowers as well as a pappus.
nb. Cassinia spectabilis is now known as Apalochlamys
spectabilis.
The 19 species of Ozothamnus (formerly included
in Helichrysum) lack these scales, but have a
pappus. One species of Ozothamnus, O.
selaginoides is presumably extinct and is not
included in the key.
To minimise the need to dissect individual flower heads,
a combined key to species is given for these genera.
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University of Tasmania
