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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 trachychlaena

HABIT Perennial; caespitose; clumped loosely. Stolons present. Culms decumbent; 20–55 cm long. Culm-internodes terete; smooth; distally glabrous. Lateral branches ample. Leaf-sheaths longer than adjacent culm internode; striately veined; smooth, or scaberulous; glabrous on surface. Ligule an eciliate membrane; 1–3 mm long; lacerate. Leaf-blades 2–7 cm long; 0.5–2 mm wide. Leaf-blade surface ribbed; grooved adaxially; scaberulous; rough adaxially. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate, or oblong; 1.5–5.5 cm long; 0.6–1.6 cm wide. Primary panicle branches appressed, or ascending; 3–5 -nate; 0.3–1.5 cm long. Panicle axis glabrous, or hispidulous. Panicle branches stiff; flexuous; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels clavate; terete; 0.3–2 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear, or lanceolate; laterally compressed; 3–4 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; with lower wider than upper; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 3–4 mm long; 1.3–1.4 length of upper glume; membranous; 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; 2–3 mm long; membranous; 1-keeled; 1–3 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent, or distinct. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma oblong, or ovate; dorsally compressed; 1.3–1.8 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent, or extending close to apex. Lemma apex erose; obtuse. Palea oblong; 0.6–0.8 mm long; 0.2 length of lemma; hyaline; 2 -veined. Palea surface scaberulous. Palea apex obtuse.

FLOWER Lodicules 2; membranous. Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Antarctic: Subantarctic islands.

NOTES Aveneae. CEH 1999.

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