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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Deschampsia mejlandii
HABIT Perennial; caespitose; clumped densely. Butt sheaths coriaceous; persistent and investing base of culm. Culms erect; 12–48 cm long; 2 -noded. Culm-internodes smooth; distally glabrous. Lateral branches lacking. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 7–15 mm long; lacerate. Leaf-blades erect; flat, or convolute; 5–22 cm long; 2.5–6 mm wide; stiff; dark green, or glaucous. Leaf-blade surface ribbed; grooved adaxially; scaberulous; rough adaxially. Leaf-blade margins scaberulous. Leaf-blade apex abruptly acute, or acute; hardened.
INFLORESCENCE Inflorescence a panicle.
Panicle open; ovate; dense; equilateral, or nodding; 10–25 cm long; 2–3.5 cm wide; contracted about primary branches. Primary panicle branches 4–8 cm long; bearing spikelets almost to the base. Panicle axis hispidulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–3.5 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 8–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite. Floret callus bearded. Floret callus hairs 2–3.5 mm long.
GLUMES Glumes persistent; similar; exceeding apex of florets; shiny; gaping. Lower glume lanceolate, or elliptic; 6.5–8.5 mm long; membranous; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins all falling short of apex. Lower glume apex acuminate. Upper glume lanceolate; 8–10 mm long; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.
FLORETS Fertile lemma oblong, or ovate; 4–5 mm long; membranous; shiny; without keel; 5–7 -veined. Lemma surface asperulous. Lemma apex dentate; 2 -fid; with lateral lobes bidentate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; straight; 6–6.5 mm long overall. Palea oblong; 3–4 mm long; 2 -veined. Palea keels ciliolate. Palea apex dentate; 2 -fid. Rhachilla extension pilose; with 1.5 mm long hairs.
FLOWER Lodicules 2; membranous. Anthers 3; 1–1.5 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.
