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Descriptions

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

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

Deyeuxia scotica

HABIT Perennial; caespitose. Rhizomes elongated. Culms erect; 50–90 cm long; 2–3 -noded. Culm-internodes smooth. Leaf-sheaths smooth. Ligule an eciliate membrane; 2–3 mm long; obtuse. Leaf-blades flat, or involute; 15–30 cm long; 3–5 mm wide. Leaf-blade venation prominent. Leaf-blade surface puberulous; hairy adaxially. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate, or oblong; dense; 7–16 cm long; 1–3 cm wide. Primary panicle branches appressed; 3–6 cm long. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–3 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.75 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 4.5–6 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 1.2–1.3 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface asperulous. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 3.5–5.5 mm long; membranous; without keel; 5 -veined. Lemma surface asperulous. Lemma apex dentate; 4 -fid; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; straight; 2.5–3 mm long overall; without a column. Palea 0.66 length of lemma. Rhachilla extension pilose.

FLOWER Lodicules 2. Anthers 3; 2 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; 2 mm long. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION Europe: northern.

NOTES Aveneae. Br Gr 1995.

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