Sporobolus partimpatens

Sporobolus partimpatens B.K.Simon. Austrobaileya  4: 64 (1993).

Classification. (GPWG 2001) : Subfamily Chloridoideae. Cynodonteae.

Type of Basionym or Protologue Information: Australia: Queensland: South Kennedy Distr.: sandy flat adjacent to Cattle Creek, 3 km S of Doongmabulla Station, 22.05.39S 146.14.23E, 1 Apr 1992, E.J. Thompson & B.K. Simon GAL-002 (HR: BRI; IT: AD, BRI, CANB, K, L, NSW).

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

Illustrations: [2005] K.Mallet (ed.), Flora of Australia 44B: Poaceae 3 (Fig. 59).

Habit. Perennial. Culms erect, 30–60 cm tall. Mid-culm internodes glabrous. Mid-culm nodes glabrous. Lateral branches simple or branched. Leaf-sheaths glabrous on surface. Ligule a fringed membrane or a fringe of hairs, 0.7–0.9 mm long. Leaf-blades linear, flat, 1.5–12 cm long, 4 mm wide. Leaf-blade surface glabrous or indumented.

Inflorescence. Inflorescence compound, a panicle. Panicle linear, 8–20 cm long, with spikelets clustered towards branch tips.

Spikelets. Spikelets sessile or pedicelled. Fertile spikelets 1-flowered, comprising 1 fertile floret(s), without rachilla extension, lanceolate, terete, 2–2.5 mm long.

Glumes. Lower glume oblong or ovate, membranous, without keels, 0 -nerved. Upper glume lanceolate or ovate, 2–2.5 mm long, membranous, without keels, 1 -nerved.

Florets. Fertile lemma 2–2.5 mm long, without keel, 1 -nerved. Lemma surface indumented. Palea 2 -nerved. Palea apex entire. Lodicules present. Anthers 3. Grain 1.1 mm long.

Continental Distribution: Australasia.

Australian Distribution: Queensland.

Queensland: Mitchell, South Kennedy, Burke.

Notes. A rare, distinctive species with the upper glume being as long as the spikelets, the lowest infloresecence node whorled and the upper inflorescence branches appressed.

Endemic; from a restricted zone around L. Galilee, central Qld. Found on clay pans and low dunes; flowers Mar.-July.


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