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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 nubigena

HABIT Perennial; caespitose; clumped densely. Culms erect; 30–100 cm long. Leaves mostly basal. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 3–4 mm long. Leaf-blades conduplicate, or involute; 5–10 cm long; 1–3 mm wide; herbaceous, or coriaceous; stiff. Leaf-blade surface smooth, or scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; oblong, or ovate; 5–30 cm long. Primary panicle branches naked below, or bearing spikelets almost to the base. Panicle branches capillary.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets lanceolate, or oblong; laterally compressed; 5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; pilose. Floret callus pilose. Floret callus hairs 1 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; similar to fertile lemma in texture; shiny. Lower glume lanceolate; 5 mm long; 1 length of upper glume; membranous; much thinner on margins; light brown; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume elliptic; 5 mm long; 1.2 length of adjacent fertile lemma; membranous; with hyaline margins; light brown; 1-keeled. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 4 mm long; membranous; shiny; without keel; 5 -veined. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; straight; 1–5 mm long overall; not or scarcely exserted from spikelet. Palea keels scaberulous. Rhachilla extension 2 mm long; pubescent.

FLOWER Lodicules 2; membranous. Anthers 3; 2 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Pacific: south-central, northwestern, and north-central.

NOTES Aveneae. Hitchcock 1993.

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