Juncus filicaulis Buchenau

Thread Rush

Proc. Linn. Soc. New South Wales 28: 913 (1904) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Densely tufted perennial with horizontal or ascending rhizomes. Cataphylls tight, pale to medium brown or pale pinkish-brown towards the base, to c. 7 cm long. Culms erect, slender and wiry, dull green to grey- or bluish-green, 15–45 cm high and 0.5–1.0(–1.2) mm diam.; striations 15–20, strongly raised and easily counted; pith cobwebby and continuous throughout or interrupted with very small air spaces; stomates superficial. Inflorescence with flowers congested into one or few globular clusters, the branches often obscured by the clusters; primary bract continuous with culm, to c. 10 cm long; prophylls present. Tepals ± strongly reddish tinged on the margins and midrib, 1.8–2.8 mm long; stamens 3, rarely 6, anthers 0.4–0.8 mm long. Capsules apically flattened, typically with a reddish-brown apex, shorter than, equal to, or longer than the tepals, 2.0–2.6 mm long. Flowers mostly Nov.–Jan., seeds shed mostly Dec.–Mar.

CVU, EGL, EGU, GipP, Gold, HNF, HSF, MonT, MuF, NIS, OtP, SnM, VAlp, VRiv, VVP, Wim. Also NSW, ACT, Tas. New Zealand. Primarily of grassy montane sites, but with several widely dispersed lowland occurrences. Infrequently collected, but perhaps overlooked due to confusion with reduced forms of the similar Juncus subsecundus.

Juncus filicaulis is characterized by the following combination of characters: wiry culms c. 1 mm or less diam. with no more than 20 striations and continuous or minutely interrupted cobwebby pith; inflorescence consisting of 1–3 globular clusters of flowers; tepals acute (but not acuminate) less than 3 mm long and strongly tinged red. Forms of J. subsecundus, J. amabilis and J. australis with fine culms and reduced inflorescences resemble J. filicaulis, but do not combine the above characteristics. Hybrids with J. subsecundus are known.

Source: Albrecht, D.E. (1994). Juncus. 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, 2019-03-04
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Poales
family Juncaceae
genus Juncus
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Juncus filicaulis in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Juncus filicaulis in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Fans present native
Gippsland Plain present native
Otway Plain present native
Goldfields present native
Central Victorian Uplands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
East Gippsland Uplands present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Monaro Tablelands present native
Victorian Alps present native
Snowy Mountains present native

State distribution

Distribution map
Western Australia
New South Wales
Australian Capital Territory