Cymbopogon bombycinus

Cymbopogon bombycinus (R.Br.) Domin. Biblioth.
85: 274 (1915).

Classification. (GPWG 2001) : Subfamily
Panicoideae. Andropogoneae.

Basionym and/or
Replacement Name:
R. Br., Prodr. 202 (1810).

Type of Basionym or
Protologue Information
: HT: R. Brown 6175, Australia: East Coast
[Upper Head, Broad Sound = Charon Point] (BM; IT: BRI, K, MEL, P).

Key references
(books and floras):
[1810]. R.Brown, Prodromus (202 as Andropogon
lanatus, Andropogon bombycinus
), [1878] G.Bentham, Flora Australiensis
7 (533 as Andropogon lanatus, Andropogon bombycinus), [1952]
C.A.Gardner, Flora of Western Australia 1 Gramineae (340), [1983]
J.C.Tothill & J.B.Hacker, Grasses of Southern Queensland (489),
[2002] D.Sharp & B.K.Simon, AusGrass, Grasses of Australia.

Perennial. Culms erect, 30–120 cm tall. Mid-culm internodes glabrous. Mid-culm
nodes bearded. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane,
2–6 mm long, membranous. Leaf-blades 15–40 cm long, 1–4.5 mm wide. Leaf-blade
surface scaberulous, glabrous.

Inflorescence compound, composed of rames. Central inflorescence axis 6–40 cm
long. Rhachis fragile at the nodes.

Spikelets sessile, 1 in the cluster. Companion spikelets pedicelled, 1 in the
cluster. Basal sterile spikelets rudimentary, 2 in number (lower raceme).
Companion spikelets developed, comprising 2 subequal glumes without lemmas or
male, 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 ovate or obovate, dorsally compressed, 4–6 mm

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

Fertile lemma without
keel. Lemma apex lobed, awned, 1 -awned. Median (principal) awn from a sinus,
6–21 mm long overall, with a twisted column. Palea absent. Anthers 3. Grain 2–5
mm long.

: Australasia.

: Western Australia, Northern Territory, Queensland.

Western Australia:
Gardner, Fitzgerald, Hall, Dampier. Canning, Fortescue, Carnarvon. Irwin,
Drummond, Menzies, Roe, Coolgardie. Northern Territory: Darwin &
Gulf, Victoria River, Barkly Tableland, Central Australia North. Queensland:
Burke, Burnett, Cook, Darling Downs, Leichhardt, Mitchell, North Kennedy, Port
Curtis, South Kennedy, Warrego.

AVH 2011


Occurs in Eucalyptus forests and savannas of tropical and subtropical
Australia. Flowers all year.

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