Isolepis platycarpa (S.T.Blake) Soják

Cas. Nar. Mus., Odd. Prir. 148: 194 (1979) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Small tufted annual or possibly short-lived perennial. Culms filiform, 2–20 cm high. Leaves reduced, blades to 15 mm long. Spikelets 1 or 2, 2.5–4.5 mm long; involucral bract mostly exceeding inflorescence; glumes obtuse, sides irregularly but conspicuously 2–5-nerved, whitish or straw-coloured or tinged orange-brown or dark red-brown, 1–1.5 mm long; stamens 3; style 3-fid. Nut unequally trigonous to planoconvex, with rounded angles, broad-obovoid to obovoid or broad-ellipsoid, minutely reticulate, glistening, dark brown to black, from one-half to two-thirds as long as glume, 0.5–0.8 mm long, 0.5–0.7 mm diam. Flowers spring–summer.

Brid, CVU, DunT, EGL, EGU, GipP, Glep, Gold, GGr, HNF, HSF, LoM, MonT, MuF, MuM, NIS, OtP, OtR, Strz, VAlp, VRiv, VVP, WaP, WPro, Wim. Also WA, SA, NSW, Tas., Norfolk Is. New Zealand. Largely coextensive with Isolepis hookeriana and sometimes occurring in mixed populations with it, possibly with a greater tolerance for environmental extremes.

Close to Isolepis cernua, and the boundary between these two species is not clear; hybrids or intergrades may occur. The nut is smaller than in I. cernua, with the angles more rounded and the surface darker with larger reticulations. The glumes generally have whitish, mostly narrower sides (c. 0.5 mm wide; cf. 0.5–0.8 mm wide in I. cernua) and tend to be more acute and more strongly folded.

Created by: Andre Messina, 2016-02-26
Updated by: Val Stajsic, 2017-11-09
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Poales
family Cyperaceae
genus Isolepis
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Isolepis platycarpa in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Isolepis platycarpa in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Lowan Mallee present native
Murray Mallee present native
Wimmera present native
Glenelg Plain present native
Bridgewater present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Fans present native
Gippsland Plain present native
Otway Plain present native
Warrnambool Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Dundas Tablelands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
East Gippsland Uplands present native
Wilsons Promontory present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Otway Ranges present native
Strzelecki Ranges present native
Monaro Tablelands present native
Victorian Alps present native