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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 reverchonii

HABIT Perennial; caespitose. Butt sheaths persistent and investing base of culm; with compacted dead sheaths. Basal innovations intravaginal. Culms 18–25 cm long. Culm-internodes smooth. Leaf-sheaths open for most of their length; with 0 of their length closed; with flat margins; glabrous on surface. Leaf-sheath auricles erect; acute. Ligule an eciliate membrane; 2 mm long. Leaf-blades curved; filiform; conduplicate; 0.4–0.55 mm wide; glaucous; pruinose. Leaf-blade venation comprising 3 vascular bundles; with 1–3 inner ridges; with sclerenchyma strands below veins and above all veins; with subepidermal sclerenchyma free from veins; with continuous uniform subepidermal sclerenchyma layer on the underside. Leaf-blade surface scabrous. Leaf-blade apex obtuse, or abruptly acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; dense; 2.5–4 cm long. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 5.7–6.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes obscured by lemmas.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 3.3 mm long; 0.75 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 3.8–4.2 mm long; chartaceous; without keel; 5 -veined. Lemma apex acute; awned; 1 -awned. Principal lemma awn 3–4 mm long overall. Palea 2 -veined. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2. Anthers 3. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; ellipsoid. Hilum linear. Disseminule comprising a caryopsis and palea.

DISTRIBUTION Europe: southwestern.

NOTES Poeae. Fl Eur 1995.

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