nodosa (sagg) is a widespread, conspicuous and very common species in
Tasmania. It occurs in damp areas along all of Tasmania's coastline,
and also in intermittently wet areas of the drier parts of the
island. It consists of tufts of stiff, erect, cylindrical stems
(typically ~ 0.5 to 1 m tall, and a few mm thick), with spherical
heads of flowers and fruit. These heads are attached at the ends of
the scapes, but appear to be lateral because of a stem-like leaf
continuing the stem.
also has spherical heads arranged similarly on erect scapes with
similar bracts, but is more aquatic and softer.