R. Br., Prod. Fl. Nov. Holl. 222 (1810).
Synonymy: Scirpus inundatus (R. Br.)Poiret, Encycl. 13:103 (1817).
, Isolepis subtilissima
Common name: Swamp club-rush.
Rather variable perennial; stems tufted, sometimes coarser than in most species, rigid or flaccid, 10-30 cm high but S. Aust. specimens usually much smaller, sometimes proliferous; leaf blades usually reduced to a mere point, sometimes more developed; bract usually longer than the spikelets, erect or oblique.
Spikelets mostly 3-12 in a cluster, ovoid to oblong, 4-6 mm long, somewhat angled, usually stained with a dark purplish-brown; glumes with a green keel and scarious 3- or 4-nerved sides, slightly mucronate, the tip erect; stamen 1; style branches 3.
Nut elliptic to almost round in outline, acute, shortly cuneate, c. 1 x 0.75 mm, triquetrous, slightly compressed, angles narrowly ribbed, sides flat to slightly convex, pallid to a pale straw-colour, finely reticulate in longitudinal rows of a transparent shiny fine papillose layer, more than half as long as the glume.
S.Aust.: FR, EP, NL, MU, SL, KI, SE. All States except the N.T. New Zealand; South America and south-east Asia.
Flowering time: usually Oct. — April.
SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia
Not yet available