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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 dyeri

HABIT Perennial; caespitose. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Basal innovations intravaginal. Culms erect, or geniculately ascending; 15–55 cm long. Leaf-sheaths smooth, or antrorsely scabrous. Ligule an eciliate membrane; 0.8–2.2 mm long; glabrous on abaxial surface, or scaberulous on abaxial surface; erose, or lacerate; truncate. Leaf-blades 3.5–10 cm long; 1–2.5 mm wide. Leaf-blade surface scaberulous; rough adaxially, or on both sides. Leaf-blade margins scaberulous. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle open; lanceolate; 5–12 cm long. Panicle axis smooth. Panicle branches scaberulous.

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

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent; hairy in 2 tufts.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 3–3.5 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; 3–3.5 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; 2.3–3.3 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma apex erose; truncate; muticous, or awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.66 way up back of lemma; straight; 0–2 mm long overall. Palea 0.5–0.8 mm long; 0.25 length of lemma; hyaline.

FLOWER Lodicules 2; membranous. Anthers 3; 0.6–1.2 mm long.

FRUIT Caryopsis with adherent pericarp; 1–1.8 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.