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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Agrostis oresbia

HABIT Perennial; caespitose. Stolons absent, or present. Basal innovations intravaginal. Culms 5–25 cm long. Leaf-sheaths smooth. Ligule an eciliate membrane; 1–4.5 mm long; glabrous on abaxial surface; entire, or erose; truncate, or obtuse. Leaf-blades flat, or conduplicate; 2–7 cm long; 1.5–2 mm wide. Leaf-blade surface smooth, or scaberulous; rough adaxially. Leaf-blade margins smooth, or scaberulous. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle open; oblong, or pyramidal; 2–6 cm long. Primary panicle branches spreading. Panicle branches smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth, or scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 2–2.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 2–2.5 mm long; 1–1.2 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute, or acuminate. Upper glume lanceolate; 1.7–2.5 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma ovate; 1.5–2 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins obscure; extending close to apex. Lemma apex obtuse; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight, or geniculate; 2–3 mm long overall; without a column, or with twisted column. Palea 0.5 mm long; 0.25–0.33 length of lemma; hyaline.

FLOWER Lodicules 2; 0.3 mm long; membranous. Anthers 3; 0.6–0.9 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.