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Descriptions

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

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

Festuca gredensis

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms erect; 18–57 cm long. Leaf-sheaths tubular for much of their length; with 0.5–0.75 of their length closed; glabrous on surface, or pilose; with reflexed hairs. Leaf-sheath auricles erect; 0.2–0.3 mm long; obtuse. Ligule a ciliolate membrane; 0.2–0.3 mm long; truncate. Leaf-blades erect; conduplicate; elliptic in section; 7–29 cm long; 0.5–1.5 mm wide; pruinose. Leaf-blade venation comprising 7–9 vascular bundles; with 2–5 inner ridges; with continuous uniform subepidermal sclerenchyma layer on the underside. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle; comprising 12–34 fertile spikelets.

Panicle open; lanceolate, or oblong; 3.5–10 cm long. Primary panicle branches 2–5 in number. Panicle axis scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–7 fertile florets; with diminished florets at the apex. Spikelets elliptic, or oblong; laterally compressed; 6–9 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2–4 mm long; 0.66–0.8 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 3–6 mm long; 0.66–0.75 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate, or oblong; 3.8–7.3 mm long; chartaceous; without keel; 5 -veined. Lemma midvein scabrous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 0.8–2.4 mm long overall. Palea 3.5–5.5 mm long. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3. Ovary glabrous.

DISTRIBUTION Europe: southwestern.

NOTES Poeae. Fuente & Ortunez 2005.

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