Nassella hyalina*

Nassella hyalina* (Nees) M.E. Barkworth. Taxon 39: 610 (1990).

Classification. (GPWG 2001) : Subfamily Pooideae. Tribe Stipeae.

Basionym and/or Replacement Name:  Stipa hyalina Nees, Fl. Bras. Enum. Pl. 2(1): 378 (1829).

Type of Basionym or Protologue Information: HT: F. Sellow, Brasilia meridionalis (B; IT: LE-TRIN-1404.01 (& fig. ex herb. Chamiss.)). de Schlechtendal 1827; herb. Chamiss.. HT: F. Sellow 636d, no date, Uruguay: Montevideo (B; IT: BAA-3088 (fragm. ex B), US-87201 (fragm.), US-81929 (fragm.)).

Key references (books and floras): [2002] D.Sharp & B.K.Simon, AusGrass, Grasses of Australia, [2008] S.W.L.Jacobs, R.D.B.Walley & D.J.B.Wheeler, Grasses of New South Wales (304), [2009] A.Wilson (ed.). Flora of Australia, Vol 44A. Poaceae 2 (66).

Illustrations: [2008] S.W.L.Jacobs, R.D.B.Whalley & D.J.B.Wheeler, Grasses of New South Wales, 4th edn (304), [2009]. A.Wilson (ed.), Flora of Australia 44A: Poaceae 2 (63, Fig 9).

Habit. Perennial. Culms erect or geniculately ascending, 25–120 cm tall. Lateral branches simple or sparsely branched. Leaf-sheaths smooth, glabrous on surface. Ligule an eciliate membrane, 0.2–2 mm long, membranous, truncate or obtuse. Leaf-blades flat or involute or convolute, 4–30 cm long, 1.5–5.5 mm wide. Leaf-blade surface scabrous.

Inflorescence. Inflorescence compound, a panicle. Panicle 5–30 cm long.

Spikelets. Spikelets pedicelled. Fertile spikelets 1-flowered, comprising 1 fertile floret(s), without rachilla extension, lanceolate, terete, 5.5–11.5 mm long.

Glumes. Glumes similar, thinner than fertile lemma. Lower glume lanceolate, hyaline, without keels, 1–3 -nerved. Upper glume lanceolate, 5.5–11.5 mm long, hyaline, without keels, 1–3 -nerved. Upper glume surface smooth or asperulous.

Florets. Fertile lemma 3–5.5 mm long, without keel, 5 -nerved. Lemma surface glabrous. Lemma apex entire, awned, 1 -awned. Median (principal) awn constricted at base (of corona), 20–45 mm long overall, without a column or with a straight or slightly twisted column. Column 15 mm long. Palea 0 -nerved, without keels. Lodicules present. Anthers 3. Grain 1.8–2.3 mm long.

Continental Distribution: Australasia and South America.

Australian Distribution: New South Wales, Victoria.

New South Wales: Central Coast, Northern Tablelands, North-Western Slopes. Victoria: Volcanic Plain.

Notes. An introduction from South America, uncommon on North Western Slopes of New South Wales, and common in the outer northern and western suburbs of Melbourne, Victoria.

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