Oplismenus compositus (L.) P.Beauv.
54, 168 (1812).
Classification. (GPWG 2001) : Subfamily Panicoideae. Paniceae.
Replacement Name: Panicum
compositum L., Sp. Pl. 1: 57 (1753).
Type of Basionym or
Protologue Information: LT: Herb. Hermann 42, v. 3, fol. 45,
(BM-SL). LT designated by Hitchcock, U.S.D.A. Bull. 772: 238 (1920);
also Davey & Clayton, Kew Bull. 33: ? (1978).
(books and floras): . R.Brown, Prodromus (194 as Orthopogon),
 G.Bentham, Flora Australiensis 7 (491),  E.E.Henty, Manual
Grasses New Guinea (132),  D.Sharp & B.K.Simon, AusGrass,
Grasses of Australia.
Perennial. Culms prostrate, 15–150 cm tall. Mid-culm nodes glabrous or
pubescent. Ligule a fringed membrane, a ciliate membrane, 0.8–1.5 mm long.
Leaf-blades lanceolate or ovate, 2–24 cm long, 8–27 mm wide. Leaf-blade surface
Inflorescence compound, a panicle of racemes. Racemes 4–12, 2.5–11 cm long
(lowest). Central inflorescence axis 5–25 cm long.
sessile and pedicelled, 2 in the cluster. 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, laterally compressed, 2.5–4 mm long.
Glumes similar or dissimilar, thinner than fertile lemma. Lower glume ovate,
herbaceous, keeled, 1-keeled, 3–5 -nerved. Lower glume surface glabrous or
indumented. Lower glume apex awned. Upper glume ovate, 1.6–3 mm long,
herbaceous, keeled, 1-keeled, 5–7 -nerved. Upper glume surface glabrous or
indumented. Upper glume apex muticous or awned. Florets. Basal sterile
florets 1, male or barren, with palea or without significant palea. Lemma of
lower sterile floret 100 % of length of spikelet, membranous, 1-keeled, 7–11
-nerved, mucronate or awned.
Fertile lemma 2–3.3 mm
long, without keel, 7 -nerved. Palea without keels.
Distribution: Africa, Temperate Asia, Tropical Asia, Australasia, Pacific,
North America, and South America.
Distribution: Northern Territory, Queensland, Christmas Is.
Darwin & Gulf. Queensland: Cook, North Kennedy, South Kennedy, Port
Diagnostic features include the elongate lowermost primary branches with
distant spikelet pairs. Oplismenus compositus intergrades with O.
hirtellus and identification of some specimens is difficult.
the tropics. In tropical heaths, tropical and subtropical rain forests,
tropical and subtropical wet sclerophyll forests, tropical and subtropical
sub-humid woodlands, and coastal grasslands. In Australia, it is restricted to
the coastal plains of tropical Qld. Flowers Apr.-Aug.