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Descriptions

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

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

Deschampsia wacei

HABIT Perennial; caespitose; clumped densely. Butt sheaths coriaceous; glossy; persistent and investing base of culm. Culms erect; 6–40 cm long; 1–2 -noded. Culm-internodes smooth. Lateral branches lacking. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 2–10 mm long; acute. Leaf-blades curved; filiform; involute; 1–12 cm long; 0.6–1.3 mm wide; stiff. Leaf-blade surface ribbed; grooved adaxially; smooth; glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate, or oblong; 2.5–15 cm long. Primary panicle branches 1–3 cm long. Panicle axis smooth; glabrous. Panicle branches smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–4 mm long; smooth.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 9–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite. Floret callus pilose. Floret callus hairs 1–2 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; shiny; gaping. Lower glume lanceolate, or elliptic; 9–10 mm long; membranous; 1-keeled; 1–3 -veined. Lower glume primary vein smooth. Lower glume lateral veins absent, or obscure. Lower glume apex acute. Upper glume lanceolate, or oblong; 9–10 mm long; membranous; 1-keeled; 1–3 -veined. Upper glume primary vein smooth. Upper glume lateral veins absent, or distinct. Upper glume apex acute.

FLORETS Fertile lemma oblong, or ovate; 5–6 mm long; membranous; shiny; without keel; 7 -veined. Lemma surface asperulous; rough above. Lemma apex dentate; 2 -fid; with lateral lobes bidentate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; straight; 5–10 mm long overall. Palea oblong; 1 length of lemma; 2 -veined. Palea keels scaberulous. Palea apex dentate; 2 -fid. Rhachilla extension pilose.

FLOWER Lodicules 2; membranous. Anthers 3; 1.2–1.4 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Antarctic: Subantarctic islands.

NOTES Aveneae. Hubbard 1999.

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