Chaetanthus aristatus (R.Br.) B.G.Briggs & L.A.S.Johnson
Telopea 8:24 (1998)

Conservation Code: Not threatened
Naturalised Status: Native to Western Australia
Name Status: Current

Brief Description
Amanda Spooner, Friday 29 August 1997

Tufted perennial, herb (rush-like), 0.2-1 m high. Fl. brown/brown-yellow, May or Aug to Dec. Sand, clay. Winter-wet depressions, inundated areas, swamps, sometimes in saline sites.

Distribution

Beard’s Provinces: South-West Province.

IBRA Regions: Avon Wheatbelt, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Swan Coastal Plain, Warren.

IBRA Subregions: Avon Wheatbelt P1, Dandaragan Plateau, Fitzgerald, Geraldton Hills, Lesueur Sandplain, Northern Jarrah Forest, Perth, Southern Jarrah Forest, Warren.

IMCRA Regions: Leeuwin-Naturaliste, WA South Coast.

Local Government Areas (LGAs): Albany, Armadale, Bridgetown-Greenbushes, Bunbury, Busselton, Canning, Capel, Cockburn, Collie, Coorow, Cranbrook, Dandaragan, Denmark, Gingin, Gosnells, Harvey, Irwin, Jerramungup, Kojonup, Manjimup, Murray, Northampton, Plantagenet, Rockingham, Serpentine-Jarrahdale, South Perth, Swan, Tammin, Three Springs, Victoria Plains, Wandering, Wanneroo, Waroona, West Arthur, York.

Scientific Description
Chris Hollister and Kevin Thiele, Tuesday 2 May 2017

Rhizomes tufted, hairy. Basal sheath glabrous, glossy, striate. Culms terete, internal structure (at base of culm) hollow, glabrous, striate, not marbled, not fasciculate. Culm 190-700 mm long. Sheaths (including blade) appressed throughout, glossy, not striate, glabrous, margins not translucent. Apex obtuse, glabrous. Dioecious (with separate male and female plants). Male and female inflorescences distinctly dissimilar, posture (male inflorescences only) Distinctly drooping, Culms unbranched below the inflorescence. Male spikelet 6-10 mm long. Subtending bract glabrous, Outer bract 3.5-4 mm long, margins thin and translucent, Apex acute. Perianth glabrous. 1.5-2 mm long. Inner bract glabrous, margins thin and translucent, Apex acuminate to attenuate. Inner bract 2.5-5.2 mm long. Filament 0-0.2 mm long. Anther 0.5-1 mm long. Female spikelet 9-12 mm long. Subtending bract glabrous, margins thin and translucent, Apex acuminate to attenuate. Outer bract 5-6.3 mm long. Perianth hairy. 6-8 mm long. Inner bracts 6.5-7 mm long, glabrous, margins thin and translucent, Apex acuminate to attenuate. Style one, arising centrally from the ovary apex. 4-6 mm long. Fruit indehiscent (nut). Flowering Time May, August, September, October, November or December. Botanical Province South-West, IBRA Bioregions Geraldton Sandplain, Swan Coastal Plain, Avon Wheatbelt, Jarrah Forest, Warren or Esperance.