Lachnagrostis adamsonii (Vickery) S.W.L.Jacobs

Adamson's Blown-grass

Telopea 9: 445 (2001) APNI

Taxonomic status:Accepted

Occurrence status:Endemic

Establishment means:Native

Threat status:EPBC: endangered (EN); Victoria: vulnerable (v); listed in Flora and Fauna Guarantee Act 1988

Tufted or rarely shortly stoloniferous annual or short-lived perennial, to 90(–120) cm tall; culms erect to geniculate, 1–4 mm wide near base. Leaf blades dull green to bluish-green when fresh, shallowly grooved, involute (although basal leaves becoming flattened with senescence), smooth, sometimes scabridulous on margins, up to 50 cm long and 2 mm wide (unflattened); ligules membranous, acute, becoming laciniate, (2–)4–6(–7) mm long. Inflorescence an open panicle, 15–25(–55) cm long and 15–25(–30) cm wide, becoming shortly exserted with maturity; primary branches clustered (commonly 4–7 at lowest whorls), spreading; secondary branching not occurring within at least the basal third of the length of lower branches. Spikelets slightly overlapping towards tips of ultimate branches, 2.5–4 mm long, green to purplish-green; glumes not widely diverging, subequal or commonly the upper longer by up to 0.5 mm, scabrous on the keels, smooth on the lateral faces, margins entire to distantly-ciliolate; lemma 2–3.3 mm long, 5-nerved, entire or 2–4-toothed, callus with a dense tuft of hairs 0.5–0.7 mm long, back and/or laterals glabrous or with sparsely scattered hairs confined to the mid-third region, awned; awn arising from upper half of lemma length, 1.2–6 mm long, straight, slightly curved or gently sinuate but never strongly geniculate; palea subequal to the lemma or shorter by up to 0.6 mm, shortly bifid; stamens 3, dehisced anthers (0.4–)0.5–1 mm long. Flowers Nov.–Feb.

CVU, DunT, GipP, Gold, GGr, OtP, VVP. Occurs in and around saline depressions on the Volcanic Plain where recorded from Portalington west almost to the South Australian border.

Three subspecies are recognised, and while ranges overlap to some degree, there appears to be ecological segregation between the subspecies. Previous records of L. adamsonii east of its currently understood limit near Portalington are more likely referable to forms of the very widespread and variable L. filiformis with reduced indumentum on the lemmas. Some of these forms may prove to be distinct taxa.

Sterile Lachnagrostis ×contracta is a presumed hybrid between L. adamsonii and L. deflexa.

 

Source: Walsh, N.G. (1994). Poaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons. Inkata Press, Melbourne (as Agrostis adamsonii Vickery).
Updated by: Neville Walsh, 2015-11-20
 
References

Brown, A.J. (2015). Subspeciation in Lachnagrostis adamsonii (Poaceae), Muelleria 34: 15-22.

 
Distribution map

Victoria

Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Lachnagrostis adamsonii in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Lachnagrostis adamsonii in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present native
Gippsland Plain present native
Otway Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Dundas Tablelands present native

State distribution

Distribution map
State
Victoria