Agrostis petriei

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 30–55 cm long. Leaf-sheaths smooth, or scaberulous. Ligule an eciliate membrane; 1–4.5 mm long; scaberulous on abaxial surface; erose; truncate, or obtuse. Leaf-blades filiform; involute; 4–10.5 cm long; 0.3–1 mm wide; stiff. Leaf-blade surface scabrous; rough abaxially. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle open; oblong; 4–16 cm long. Primary panicle branches spreading. Panicle axis smooth. Panicle branches capillary; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 2.5–3.4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 2.5–3.4 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.5–3.4 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma ovate; 2–2.6 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma apex erose; truncate, or obtuse; muticous, or awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 2–3 mm long overall. Palea 0.2–0.4 mm long; 0.1–0.15 length of lemma; hyaline.

FLOWER Lodicules 2; 0.2–0.4 mm long; membranous. Anthers 3; 1.3–1.7 mm long.

FRUIT Caryopsis with adherent pericarp; 1.5 mm long. Hilum linear.

DISTRIBUTION Australasia: New Zealand.

NOTES Aveneae. Edgar 1994.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.