Cymbopogon obtectus

Cymbopogon obtectus S. T. Blake. Univ.
Queensland Dept. Biol. Pap
2(3): 55 (1944).

(GPWG 2001) : Subfamily Panicoideae. Andropogoneae.

Type of Basionym or
Protologue Information
: HT: S.T. Blake 6517, 29 Jun 1934, Australia:
Queensland: Gregory North District: Woodstock, west of Winton (BRI-010799; IT:
K, US-1865510).

Key references
(books and floras):
[1981] M.Lazarides in J.Jessop (ed)., Flora of
Central Australia
(489), [2002] D.Sharp & B.K.Simon, AusGrass,
Grasses of Australia
, [2006] J.Jessop, G.R.M.Dashorst, F.M.James, Grasses
of South Australia
(514), [2008] S.W.L.Jacobs, R.D.B.Walley &
D.J.B.Wheeler, Grasses of New South Wales (191).

[2006] J.Jessop, G.R.M.Dashorst, F.M.James, Grasses of South Australia  (515, Fig. 441), [2008] S.W.L.Jacobs,
R.D.B.Whalley & D.J.B.Wheeler, Grasses of New South Wales, 4th edn

Perennial. Culms 50–100 cm tall, 1–2 -noded. Mid-culm nodes glabrous or
pubescent. Ligule an eciliate membrane, 3–5 mm long. Leaf-blades flat or
conduplicate or revolute, 15–35 cm long, 1–3 mm wide.

Inflorescence compound, composed of rames. Central inflorescence axis 7–25 cm
long. Rhachis fragile at the nodes.

Spikelets sessile, 1 in the cluster. Companion spikelets pedicelled, 1 in the
cluster. Basal sterile spikelets well-developed, 2 in number (lower raceme).
Companion spikelets developed, comprising 2 unequal glumes without lemmas or
containing empty lemmas, 3–5 mm long. Companion spikelet glumes muticous.
Fertile spikelets 2-flowered, the lower floret barren (rarely male), the upper
fertile, comprising 1 basal sterile florets, comprising 1 fertile floret(s),
without rachilla extension, lanceolate or elliptic or oblong or obovate, dorsally
compressed, 5–6.4 mm long.

Glumes. Glumes
dissimilar, firmer than fertile lemma. Lower glume lanceolate, chartaceous,
keeled, 2-keeled, wingless, 0–5 -nerved. Upper glume lanceolate, keeled,
1-keeled, 5–7 -nerved. Florets. Basal sterile florets 1, barren, without
significant palea. Lemma of lower sterile floret hyaline, 2–3 -nerved.

Fertile lemma 3.6–4.5
mm long, without keel, 1–3 -nerved. Lemma apex lobed, awned, 1 -awned. Median
(principal) awn from a sinus, 6–8 mm long overall, without a column or with a
straight or slightly twisted column. Palea absent. Anthers 3.

: Australasia.

: Western Australia, Northern Territory, South Australia,
Queensland, New South Wales, Victoria.

Western Australia:
Canning, Giles, Fortescue, Carnarvon. Irwin, Drummond, Coolgardie. Northern
: Victoria River, Barkly Tableland, Central Australia North,
Central Australia South. South Australia: North-western, Lake Eyre,
Gairdner-Torrens Basin, Eyre Peninsula, Northern Lofty, Murray, Southern Lofty.
Queensland: Burke, Burnett, Darling Downs, Gregory North, Maranoa,
Mitchell, Moreton, Port Curtis, South Kennedy, Warrego, Cook, North Kennedy,
Leichhardt, Gregory South. New South Wales: North Coast, Northern
Tablelands, North-Western Slopes, Central-Western Slopes, North-Western Plains,
North Far Western Plains. Victoria: Murray Mallee, Riverina.

A species occurring in drier regions of Australia. Flowers all year.

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