Plinthanthesis rodwayi

Plinthanthesis rodwayi (C.E. Hubbard) S. T.
Blake. Contr. Qd Herb. 14: 3 (1972).

Classification. (GPWG 2001) : Subfamily
Danthonioideae. Tribe Danthonieae.

Basionym and/or
Replacement Name:
C.E. Hubb., Hooker's Icon. Pl. 35 t.: 3439 (1943).

Type of Basionym or
Protologue Information
: HT: Rodway s.n., Australia (K; IT: FAR,

Recent synonyms:
Danthonia rodwayi.

Key references (books
and floras):
[2002] D.Sharp & B.K.Simon, AusGrass, Grasses of
, [2008] S.W.L.Jacobs, R.D.B.Walley & D.J.B.Wheeler, Grasses
of New South Wales

[2005] K.Mallet (ed.), Flora of Australia 44B: Poaceae 3 (Fig. 5,
H), [2008] S.W.L.Jacobs, R.D.B.Whalley & D.J.B.Wheeler, Grasses of New
South Wales
, 4th edn (343).

Perennial. Culms decumbent, 20–60 cm tall, 2–3 -noded. Leaves mostly basal.
Ligule a fringe of hairs. Leaf-blades curled, filiform, involute or convolute,
10–20 cm long, 1–2 mm wide.

Inflorescence compound, a panicle. Panicle ovate, 4–8 cm long, 4–6 cm wide.

Spikelets pedicelled. Fertile spikelets many flowered, with at least 2 fertile
florets (2–3), comprising 2–3 fertile floret(s), without rachilla extension or
with a barren rachilla extension (when 2-fld), oblong, laterally compressed,
4.5–6.5 mm long.

Glumes. Glumes
similar. Lower glume lanceolate, chartaceous, keeled, 1-keeled, 1–3 -nerved.
Upper glume lanceolate, 4.5–6.5 mm long, chartaceous, keeled, 1-keeled, 1–3
-nerved. Upper glume surface asperulous.

Fertile lemma 2–4 mm long, without keel, 9 -nerved. Lemma surface indumented.
Lemma apex dentate, muticous or mucronate. Median (principal) awn 0.5–1.5 mm
long overall. Palea 2 -nerved. Lodicules present. Anthers 3. Grain 1.4–1.5 mm

: Australasia.

: New South Wales.

New South Wales:
Southern Tablelands.

P. rodwayi is close to P. paradoxa, and differs by the lemma awn being
either completely lost, or if still present, then straight, and by the expanded
leaf-blades. Although there is a strong superficial similarity between the two
taxa, no intermediate specimens have been found, and they do not co-occur.

to the Mt Budawang in New South Wales., altitude 1100 m, Grassy heathland,
local usually within shrubs of Banksia or Leptospermum growing to
a height of 0.5–1 m, rarely in the open, apparently very heavily grazed, also
along access track. Flowers Dec. or Jan.


AVH 2011


Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith