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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 compressifolia

HABIT Perennial. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms geniculately ascending; 40–80 cm long; 1–2 -noded. Culm-internodes smooth, or scaberulous. Leaf-sheaths open for most of their length; glabrous on surface. Ligule a ciliolate membrane; 2–4 mm long; truncate. Leaf-blades convolute; 15–45 cm long; 2–3 mm wide; coriaceous. Leaf-blade surface smooth, or scabrous; rough adaxially, or on both sides; glabrous. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic; 15–25 cm long. Primary panicle branches ascending; 7–15 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 8–11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes scaberulous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 4.5–6 mm long; 0.8–0.9 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 5.6–7 mm long; 1 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume apex acute.

FLORETS Fertile lemma oblong; 5.5–7 mm long; chartaceous; without keel; 5 -veined. Lemma surface asperulous. Lemma apex acute; muticous, or mucronate. Palea 1 length of lemma; 2 -veined. Palea keels scabrous. Palea surface scaberulous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2. Anthers 3; 2.2–3 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION South America: western South America.

NOTES Poeae. Gr Peru 1995.

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