Zygochloa paradoxa (R.Br.) S.T.Blake. Univ.
Dept. Biol. Pap 1 (19): 8 (1941).
Classification. (GPWG 2001) : Subfamily
Replacement Name: Neurachne
paradoxa R. Br., Exped. Centr. Austral. 2: App. 89 (1849).
Type of Basionym or
Protologue Information: Australia:
(books and floras):  G.Bentham, Flora Australiensis 7 (504 as Spinifex
paradoxus),  M.Lazarides in J.Jessop (ed)., Flora of Central
Australia (483),  D.Sharp & B.K.Simon, AusGrass, Grasses of
Australia,  J.Jessop, G.R.M.Dashorst, F.M.James, Grasses of South
Australia (497),  S.W.L.Jacobs, R.D.B.Walley & D.J.B.Wheeler, Grasses
of New South Wales (403).
 J.Jessop, G.R.M.Dashorst, F.M.James, Grasses of South Australia (498, Fig. 428),  S.W.L.Jacobs,
R.D.B.Whalley & D.J.B.Wheeler, Grasses of New South Wales, 4th edn
from the Greek para (irregular) and doxa (opinion). Different
from the expected in regard to related species.
Perennial. Rhizomes present, elongated. Culms geniculately ascending, 40–150 cm
tall, 4–8 mm diam., woody. Lateral branches suffrutescent. Ligule a fringe of
hairs, 0.5–1.2 mm long. Leaf-blades 1–30 cm long, 1–10 mm wide.
Inflorescence compound, a panicle, with racemose branches.
Spikelets sessile. Male spikelets sessile. 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,
elliptic, dorsally compressed, 5–10 mm long.
similar, thinner than fertile lemma. Lower glume ovate, chartaceous, without
keels, 7–9 -nerved. Lower glume surface indumented. Upper glume ovate, 5–10 mm
long, chartaceous, without keels, 7–9 -nerved. Upper glume surface glabrous or
indumented. Florets. Basal sterile florets 1, barren, with palea. Lemma
of lower sterile floret 100 % of length of spikelet, chartaceous, 5 -nerved.
Fertile florets female.
lemma 4.5–10 mm long, 5 -nerved. Lemma surface glabrous. Anthers 3. Grain 3 mm
Distribution: Northern Territory, South Australia, Queensland,
New South Wales.
Territory: Central Australia North, Central
Australia South. South Australia:
Lake Eyre, Gairdner-Torrens Basin, Flinders
Ranges, Eastern, Eyre
Gregory North, Gregory South. New
South Wales: North Far Western Plains, South Far
Disarticulation is primarily at the compacted culm nodes and secondarily at the
spikelet base. The disseminule consists of a spikelet, a very short pedicel,
and 3 highly modified bracts with pronounced curved wings. These unusual
modifications undoubtedly assist in dispersal.
Spikelets of the male inflorescence occur in a
reduced panicle and the prolonged rachis, bract and prophyllum are not modified
into winged structures.
In shrub steppe
shrublands, arid tussock grasslands, and arid hummock grasslands. Flowers mostly