Hymenachne acutigluma

Hymenachne acutigluma (Steud.)
Gilliland. Gard. Bull. Straits Settlem. 20: 314 (1963).

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

Basionym and/or
Replacement Name:
Steud. Syn. Pl. Glumac. 1: 66 (1853).

Type of Basionym or
Protologue Information
: Philippine Islands:, Cuming 2287 (HT: P; IT:

Key references
(books and floras):
[1878] G.Bentham, Flora Australiensis 7 (480 as
?Panicum myuros), [1969] E.E.Henty, Manual Grasses New Guinea
(109 as H. amplexicaulis), [2002] D.Sharp & B.K.Simon, AusGrass,
Grasses of Australia

Perennial. Stolons present. Culms decumbent, 30–200 cm tall, spongy. Mid-culm
internodes solid. Ligule an eciliate membrane, 0.7–2 mm long. Leaf-blades
linear or lanceolate, 12–45 cm long, 6–30 mm wide.

Inflorescence solid, a panicle. Panicle linear, 8–50 cm long, 1–3.5 cm wide.

Spikelets pedicelled. 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,
dorsally compressed, 4.5–5.5 mm long. Rhachilla internodes elongated between

Glumes. Glumes
dissimilar, thinner than fertile lemma. Lower glume ovate, hyaline, without
keels, 3–5 -nerved. Upper glume ovate, 3–4.3 mm long, membranous, without
keels, 3–5 -nerved. Upper glume surface asperulous. Upper glume apex awned. Florets.
Basal sterile florets 1, barren, without significant palea. Lemma of lower
sterile floret 100 % of length of spikelet, membranous, 5 -nerved, awned.

Fertile lemma 2.5–3.5
mm long, without keel, 3 -nerved. Palea 2 -nerved. Anthers 3.

: Temperate Asia, Tropical Asia, and Australasia.

: Northern Territory, Queensland.

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

Variable in habit and size of the spikelets.

In tropical and
subtropical wet sclerophyll forests, tropical and subtropical sub-humid
woodlands, and coastal grasslands. An aquatic or subaquatic species
occasionally collected in the tropics of Qld and the N.T. Flowers sporadically
throughout the 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