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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 igoschiniae

HABIT Perennial; caespitose; clumped densely. Butt sheaths persistent and investing base of culm; with compacted dead sheaths. Basal innovations intravaginal. Culms 20–50 cm long. Culm-internodes smooth, or scaberulous. Leaf-sheaths tubular for much of their length; with 0.4–0.66 of their length closed; with flat margins; smooth, or scaberulous; glabrous on surface. Leaf-sheath auricles erect; obtuse. Ligule an eciliate membrane. Leaf-blades filiform; conduplicate; elliptic in section; 0.55–0.85 mm wide; glaucous. Leaf-blade venation comprising 5 vascular bundles; with 3 inner ridges; with 5–7 subepidermal sclerenchyma strands; with subepidermal sclerenchyma strands unequal in size; with subepidermal sclerenchyma free from veins; without layer of subepidermal sclerenchyma masking vein striation. Leaf-blade surface smooth. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle.

Panicle open; dense; 5–8 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 7.2–7.3 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; 4.1–4.6 mm long; 0.8 length of adjacent fertile lemma; chartaceous; with scarious margins; without keels; 3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 5–5.5 mm long; chartaceous; mid-green and purple; suffused with last colour; without keel; 5 -veined. Lemma surface smooth, or scabrous; rough above. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 2–2.7 mm long overall. Palea 2 -veined. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3.

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

DISTRIBUTION Europe: eastern.

NOTES Poeae. Fl Eur 1995.

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