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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 pampeana

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms erect; 60–90 cm long; 2–3 -noded; with 0.5–0.66 of their length below uppermost node. Culm-internodes terete; smooth, or scaberulous. Culm-nodes glabrous. Leaf-sheaths open for most of their length; mostly shorter than adjacent culm internode; glabrous on surface. Ligule a ciliolate membrane; 1 mm long. Leaf-blades filiform; conduplicate; 0.5–0.6 mm wide; stiff. Leaf-blade venation with subepidermal sclerenchyma free from veins; without layer of subepidermal sclerenchyma masking vein striation. Leaf-blade surface scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 10 cm long. Primary panicle branches ascending. Panicle axis scabrous. Panicle branches flexuous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 7.5–8 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 lanceolate; 5–5.5 mm long; 0.75 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; 6.5–7 mm long; 0.9 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 7.5–8 mm long; chartaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma apex acuminate; muticous, or awned; 1 -awned. Principal lemma awn 0–2 mm long overall. Palea 7–7.5 mm long; 2 -veined. Palea keels ciliolate. Palea surface scaberulous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 3.5–4 mm long. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; hairy at apex. Hilum linear; 0.75 length of caryopsis.

DISTRIBUTION South America: southern South America.

NOTES Poeae. Turpe 1995.

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