Classification
 Nomenclature
Scientific Name:
Poa sieberiana Spreng., Syst. Veg., ed. 16, 4(2), Cur. Post. 35 (1827)
Vernacular Name(s):
Rough poa tussock
 Description

Stiff, fine-leaved, greyish green, small, wiry, tussocks to c. 80 cm, from a narrow base packed with dead dry leaves; branching intravaginal; leaf-blades persistent. Leaf-sheath light brown, becoming dull grey-brown, coriaceous, smooth or slightly scabrid. Ligule c. 0.3 mm, a truncate minutely ciliate rim, abaxially with minute prickle-teeth. Leaf-blade 15–25–(35) cm, inrolled, c. 0.5 mm diam., abaxially usually finely scabrid, adaxially densely short-scabrid; margins finely scabrid, tip long, fine, acicular. Culm 30–75 cm, erect, internodes smooth to finely scabrid. Panicle 10–20 cm, contracted at first, later lax with spreading, slender, finely scabrid branches tipped by numerous spikelets. Spikelets (3.5)–4–5–(6.5) mm, 3–6–(8)-flowered, light green often purpled. Glumes ± unequal, narrow-lanceolate to narrow-ovate, acute to subacuminate, keels and sometimes internerves scabrid; lower 1.5–2 mm, 1–3-nerved, upper 2–2.5 mm, 3-nerved; margins minutely scabrid. Lemma c. 2.5 mm, 5-nerved, elliptic-oblong, ± closely pubescent on lower ½, usually with slightly longer hairs on keel and marginal nerves, tip obtuse, short-ciliate. Palea 2–2.5 mm, keels scabrid above and finely ciliolate in lower ½, interkeel pubescent especially in lower ½. Callus glabrous or with a few long hairs. Rachilla c. 0.5 mm, with a few short hairs. Lodicules 0.4–0.6 mm. Anthers 1.2–1.5 mm. Caryopsis c. 1.5 × 0.5 mm.

[From: Edgar and Connor (2000) Flora of New Zealand. Volume 5 (second printing).]

 Biostatus
Exotic
 Bibliography
Edgar, E. 1986: Poa L. in New Zealand. New Zealand Journal of Botany 24: 425–503.
Sprengel, K.P.J. 1827: Systema vegetabilium. Editio decima sexta. Vol. 4(2). Curae Posteriores. Göttingen.