Bolboschoenus caldwellii (V.J.Cook) Soják

Marsh Club-rush

Cas. Nar. Mus., Odd. Prir. 141: 62 (1972) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Rhizomatous perennial. Culms 30–90(–120) cm high, 1–3.5 mm diam. Leaves ± erect 2–7 mm wide. Inflorescence a compact head of 3–6 spikelets, or with 1–3 spikelet clusters on branches 1–4 cm long; involucral bracts 4–22 cm long, 1.5–2.5 mm wide. Spikelets 1–2 cm long; glumes yellow-brown, c. 7 mm long, plus awn c. 2 mm long; hypogynous bristles about half as long as nut, usually deciduous; style 2-fid. Nut lenticular with concave faces, broad-obovoid, straw-coloured to dark golden brown, shining, minutely but obviously reticulate, 3.5–4 mm long, 2.5–3 mm diam. Flowers spring–summer.

CVU, DunT, EGL, GipP, Gold, HSF, MuF, MuM, NIS, OtP, OtR, RobP, VRiv, VVP, WaP, Wim. All States. New Zealand. Occasional, on margins of fresh to subsaline swamps, slow-flowing watercourses, and in shallow drains.

More slender than the other species, usually with leaves ± erect, with a small clustered inflorescence, and the nut broad and always lenticular, with surface minutely but obviously reticulate under a hand-lens.

Source: Wilson, K.L. (1994). Cyperaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2018-07-31
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Poales
family Cyperaceae
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Bolboschoenus caldwellii in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Bolboschoenus caldwellii in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present native
Wimmera present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Robinvale Plains 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
Dundas Tablelands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
Highlands-Southern Fall present native
Otway Ranges present native

State distribution

Distribution map
Western Australia
Northern Territory
South Australia
New South Wales
Australian Capital Territory