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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 goughensis

HABIT Perennial; mat forming. Stolons present. Culms decumbent; 40–80 cm long; 3–7 -noded; rooting from lower nodes. Culm-internodes terete; smooth; distally glabrous. Leaf-sheaths mostly shorter than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane; 5–10 mm long; obtuse. Leaf-blades 1–10 cm long; 3–6 mm wide. Leaf-blade surface ribbed; grooved adaxially; scaberulous; rough adaxially. Leaf-blade margins scaberulous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 10–23 cm long; 1–3 cm wide; contracted about primary branches. Primary panicle branches spreading; 2–5 cm long; bearing spikelets almost to the base. Panicle axis scabrous. Panicle branches capillary.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; terete; 1–4 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 4–4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.2–0.5 mm long.

GLUMES Glumes persistent; similar; with lower wider than upper; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 4–4.5 mm long; 1–1.1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4–4.5 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma oblong, or ovate; 2–2.3 mm long; hyaline; without keel; 5 -veined. Lemma surface pubescent. Lemma apex obtuse; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 1–2.5 mm long overall. Palea oblong; 1 mm long; 0.25 length of lemma; hyaline; 2 -veined. Palea apex obtuse.

FLOWER Lodicules 2; membranous. Anthers 3; 0.8–1 mm long.

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.