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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 eriostoma

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms 10–18 cm long; 2 -noded. Leaves distichous. Leaf-sheaths longer than adjacent culm internode; glabrous on surface. Ligule a ciliolate membrane; 0.5 mm long. Leaf-blades filiform; conduplicate; 5–9 cm long; 1 mm wide; stiff. Leaf-blade venation with subepidermal sclerenchyma attached to veins above and below; with continuous uniform subepidermal sclerenchyma layer on the underside. Leaf-blade surface pubescent; hairy adaxially. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 4–8 cm long. Primary panicle branches appressed; 2 -nate; simple. Panicle axis smooth.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–5 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 8–9 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long; smooth.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 5–6 mm long; 0.8 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume primary vein smooth. Lower glume lateral veins absent. Lower glume margins ciliolate. Lower glume apex acute. Upper glume lanceolate; 6–7 mm long; 1 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume primary vein smooth. Upper glume margins ciliolate. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 6–7 mm long; chartaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma margins ciliate. Lemma apex acute; muticous. Palea 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

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

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION South America: southern South America.

NOTES Poeae. Turpe 1995.

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