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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 holgateana

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms erect; 9–24 cm long. Culm-internodes terete; smooth; distally glabrous. Leaf-sheaths longer than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane; 1–2.5 mm long; truncate, or obtuse. Leaf-blades erect; straight, or curved; filiform; involute; 3–6 cm long; 0.4–0.6 mm wide; stiff. Leaf-blade surface ribbed; grooved adaxially; scaberulous; rough adaxially. Leaf-blade margins scaberulous. Leaf-blade apex obtuse, or abruptly acute.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; 1.5–3.5 cm long; 0.2–0.4 cm wide. Primary panicle branches appressed; 2–3 -nate; 0.7–1.5 cm long. Panicle axis smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; terete; 0.5–2.5 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 4–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; with lower wider than upper; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 4–5 mm long; 1.3–1.4 length of upper glume; cartilaginous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acute. Upper glume lanceolate; 3.5 mm long; chartaceous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma elliptic, or ovate; 1.6–1.7 mm long; hyaline; without keel; 3–5 -veined. Lemma apex entire, or dentate; 2 -fid; truncate; mucronate. Principal lemma awn 0.4–0.8 mm long overall. Palea oblong; 0.66 length of lemma; hyaline; 2 -veined. Palea apex emarginate, or truncate.

FLOWER Lodicules 2; membranous. Anthers 3.

FRUIT Caryopsis with adherent pericarp; lanceolate, or oblong; 1–1.2 mm long.

DISTRIBUTION Antarctic: Subantarctic islands.

NOTES Aveneae. CEH 1999.

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