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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 fiebrigii

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; 40–70 cm long; 2 -noded. Culm-internodes terete. Leaf-sheaths glabrous on surface. Ligule a ciliolate membrane; 1 mm long; truncate. Leaf-blades filiform; conduplicate; 15–25 cm long; 1.4–1.5 mm wide. Leaf-blade venation comprising 13 vascular bundles; with 5 inner ridges; with 23 subepidermal sclerenchyma strands; with subepidermal sclerenchyma attached to veins above and below; without layer of subepidermal sclerenchyma masking vein striation. Leaf-blade surface scaberulous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 10–25 cm long. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–5 fertile florets; with diminished florets at the apex. Spikelets lanceolate, or elliptic; laterally compressed; 8–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long; scaberulous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume linear; 4–5 mm long; 0.8–0.9 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; 5–6 mm long; 1.2–1.3 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma ovate; 4–4.5 mm long; chartaceous; without keel; 5 -veined. Lemma surface scabrous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 1–2 mm long overall. Palea 5–5.5 mm long; 1.2 length of lemma; 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

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

FRUIT Caryopsis with adherent pericarp; oblong; 3.5 mm long; glabrous. Hilum linear; 0.75 length of caryopsis.

DISTRIBUTION South America: western South America and southern South America.

NOTES Poeae. Turpe 1997.

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