Isachne confusa

Isachne confusa Ohwi. Bull. Tokyo
Sci. Mus.
18: 14 (1947).

Classification. (GPWG 2001) : Subfamily
Micrairoideae. Isachneae.

Type of Basionym or
Protologue Information
: Indonesia: Sumatra: Sumatera Selatan, Bangka, 30 m,
18 Oct. 1917, Bünnemeijer 1577 (HT: BO; IT: L).

Key references
(books and floras):
[1969] E.E.Henty, Manual Grasses New Guinea
(113), [2002] D.Sharp & B.K.Simon, AusGrass, Grasses of Australia.

Habit. Perennial.
Culms geniculately ascending or decumbent, 10–45 cm tall, wiry. Lateral
branches branched. Leaf-sheaths hairy. Ligule a fringe of hairs or absent.
Leaf-blades ovate, 0.7–2.5 cm long, 2–10 mm wide.

Inflorescence compound, a panicle. Panicle ovate, 1–4 cm long, 2.5 cm wide.
Racemes 1–4 cm long.

Spikelets pedicelled. Fertile spikelets 2-flowered, the lower floret barren
(rarely male), the upper fertile, comprising 1 basal sterile florets,
comprising 1–2 fertile floret(s), without rachilla extension, orbicular, terete
or dorsally compressed, 1–1.2 mm long.

Glumes. Glumes
similar, thinner than fertile lemma. Lower glume oblong, membranous, without
keels, 5(–7) -nerved. Lower glume surface indumented. Upper glume oblong,
0.85–1.1 mm long, membranous, without keels, 5(–7) -nerved. Upper glume surface
indumented. Florets. Basal sterile florets 1, male, with palea. Lemma of
lower sterile floret 100 % of length of spikelet, coriaceous or indurate, 5
-nerved. Fertile florets female.

Fertile lemma 0.7–1 mm
long, without keel. Palea 2 -nerved. Anthers 3.

: Tropical Asia, Australasia, and Pacific.

: Northern Territory, Queensland.

Northern Territory:
Darwin & Gulf. Queensland: Cook, North Kennedy.

Notes. Native
(?). In tropical and subtropical sub-humid woodlands and coastal grasslands.
Flowers May-Oct.

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