Pterostylis tenuissima Nicholls

Swamp Greenhood

Victorian Naturalist 67: 46, figs K-P (1950) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:EPBC: vulnerable (VU); Victoria: vulnerable (v)

Flowering plant to 30 cm tall, stem very slender, stem leaves 4–7, loosely sheathing to spreading. Rosette leaves 3–6, ovate, 3–20 mm long, 2–7 mm wide, petiolate, margins entire. Flower 1.2–1.5 cm long, translucent white with dark green stripes and suffusions. Dorsal sepal with decurved filiform point 10–15 mm long; petal margins narrow, not flared; lateral sepals erect, tightly embracing the galea, sinus broadly v-shaped when viewed from the front, protruding in a prominent bulge when viewed from the side, free points to 2–2.5 cm long, filiform, erect or lax. Labellum narrowly ovate-lanceolate, 6–8 mm long, 1.5–2 mm wide, dark brown, curved, the distal third protruding from the sinus in the set position. Flowers Oct.–Mar.

Brid, DunT, GipP, Glep, VVP, WaP, WPro, Wim. Also SA. South-west Victoria, with disjunct eastern occurrences at Wilsons Promontory and possibly Cape Schanck, growing in black peaty mud under dense cover of Leptospermum lanigerum (Woolly Tea-tree).

Source: Jones, D.L. (1994). Pterostylis. 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: Jeff Jeanes, 2015-06-16
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Asparagales
family Orchidaceae
genus Pterostylis
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Pterostylis tenuissima in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Pterostylis tenuissima in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present native
Glenelg Plain present native
Bridgewater present native
Victorian Volcanic Plain present native
Gippsland Plain present native
Warrnambool Plain present native
Dundas Tablelands present native
Wilsons Promontory present native

State distribution

Distribution map
South Australia
Australian Capital Territory