Chrysopogon setifolius

Chrysopogon setifolius Stapf. Bull. Misc. Inform. 29 (1917).

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

Type of Basionym or Protologue Information: North Australia: Port Darwin, Schultz 661 (HT: K).

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

Habit. Perennial. Rhizomes present, short. Culms erect, 40–50 cm tall. Lateral branches simple. Ligule a fringe of hairs. Leaf-blades filiform, involute, 8–20 cm long, 0.75–1 mm wide. Leaf-blade surface glabrous or indumented.

Inflorescence. Inflorescence compound, a panicle of rames. Panicle lanceolate, 7–12 cm long. Rhachis obsolete.

Spikelets. Spikelets sessile, 1 in the cluster. Companion spikelets pedicelled, 2 in the cluster. Companion spikelets developed, male, 5–8 mm long. Companion spikelet glumes muticous. 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, linear or lanceolate, terete, 6–8 mm long.

Glumes. Glumes dissimilar, firmer than fertile lemma. Lower glume lanceolate, coriaceous, without keels, 9 -nerved. Upper glume lanceolate, coriaceous, keeled, 1-keeled, 6–7 -nerved. Upper glume apex muticous. Florets. Basal sterile florets 1, barren, without significant palea. Lemma of lower sterile floret hyaline, 2 -nerved.

Fertile lemma 4–5 mm long, without keel, 3 -nerved. Lemma apex entire, muticous. Palea present or absent.

Continental Distribution: Australasia.

Australian Distribution: Western Australia, Northern Territory, Queensland.

Western Australia: Gardner. Northern Territory: Darwin & Gulf. Queensland: Cook.

Notes. A rare species from only a few localities in northern tropical Australia. Flowers Oct.-Dec.

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