Isachne sharpii

Isachne sharpii B.K.Simon, Austrobaileya 9: 207 (2010).

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

Key references
(books and floras):
[2002] D.Sharp & B.K.Simon, AusGrass, Grasses of
(as I. sp. A).

Habit. Annual.
Culms geniculately ascending or aquatic, stature slender to delicate, 26–44 cm
tall. Mid-culm nodes glabrous. Lateral branches simple. Leaf-sheaths glabrous
on surface. Ligule a fringe of hairs, 1.5–1.7 mm long. Leaf-blades lanceolate,
2.5–5.5 cm long, 7–13 mm wide. Leaf-blade surface glabrous.

Inflorescence compound, a panicle. Panicle ovate, 3.5–4 cm long, 1–3 cm wide.

Spikelets pedicelled. Fertile spikelets 2-flowered, both fertile (?),
comprising 2 fertile floret(s), without rachilla extension, lanceolate,
dorsally compressed, 2.5–2.8 mm long.

Glumes. Glumes
similar, firmer than fertile lemma. Lower glume lanceolate, coriaceous, without
keels, 7–8 -nerved. Lower glume surface indumented. Upper glume lanceolate, 2.8
mm long, coriaceous, without keels, 9 -nerved. Upper glume surface indumented. Florets.
Basal sterile florets 1, barren, with palea. Lemma of lower sterile floret 50 %
of length of spikelet, coriaceous, 5 -nerved. Fertile florets bisexual.

lemma 1.5 mm long, without keel, 3 -nerved. Lemma surface glabrous. Lemma apex
round at apex. Palea present, 2 -nerved. Anthers 3.

: Australasia.

: Queensland.


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