Schizachyrium occultum

Schizachyrium occultum S. T. Blake. Contr.
17: 24 (1974).

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

Type of Basionym or
Protologue Information
: HT: S.T. Blake 21283, 22 May 1962, Australia: Queensland: Cook District: Cooktown, damp
sandy ground in Eucalyptus forest, green to reddish tufts (BRI; IT: L,

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

Habit. Annual.
Culms stature slender to delicate, 10–30 cm tall, 0.3–0.5 mm diam., 8–12
-noded. Lateral branches branched. Leaf-sheaths smooth. Ligule an eciliate
membrane, 0.15–0.25 mm long. Leaf-blades conduplicate or convolute, 1.5–3.5 cm
long, 0.6–2 mm wide.

Inflorescence solid or compound, a rame, a panicle of rames. Rhachis fragile at
the nodes.

Spikelets sessile, 1 in the cluster. Companion spikelets pedicelled, 1 in the
cluster. Companion spikelets rudimentary, comprising 2 unequal glumes without
lemmas, 0.9–1.2 mm long. Companion spikelet glumes awned. 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 or ovate, laterally compressed, 3.75–5.1 mm

Glumes. Glumes
dissimilar, firmer than fertile lemma. Lower glume lanceolate, chartaceous,
keeled, 2-keeled, wingless. Lower glume surface indumented. Upper glume
lanceolate, membranous, keeled, 1-keeled. Upper glume surface indumented. Upper
glume apex mucronate. Florets. Basal sterile florets 1, barren, without
significant palea. Lemma of lower sterile floret 100 % of length of spikelet,
hyaline, 0 -nerved.

Fertile lemma 3–3.5 mm
long, without keel, 1 -nerved. Lemma apex lobed, awned, 1 -awned. Median
(principal) awn from a sinus, 9–13 mm long overall, with a twisted column.
Column 4–5 mm long. Palea absent. Grain 2.6–3 mm long.

: Australasia.

Australian Distribution:
Northern Territory, Queensland.

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

Notes. An
annual found in sandy soils of northern Qld and one record from Maria Is.,
N.T., usually associated with other Schizachyrium species. Flowers


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