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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 olchonensis

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms erect; 25–50 cm long. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths open for most of their length; with 0.33 of their length closed; glabrous on surface, or puberulous. Ligule an eciliate membrane. Leaf-blades filiform; conduplicate; elliptic in section; 10–15 cm long; 0.4–0.65 mm wide. Leaf-blade venation comprising 5(–7) vascular bundles; with 1(–3) inner ridges; with 5–7 subepidermal sclerenchyma strands; without layer of subepidermal sclerenchyma masking vein striation, or with sclerenchyma strands widened to form a discontinuous subepidermal layer, or with continuous uniform subepidermal sclerenchyma layer on the underside. Leaf-blade surface scabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 3.5–7.5 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 ovate; laterally compressed; 5–5.6 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; dissimilar; shorter than spikelet. Lower glume lanceolate; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; chartaceous; without keels; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4–4.5 mm long; chartaceous; without keel; 5 -veined. Lemma surface glabrous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 1–3.2 mm long overall. Palea 2 -veined. Palea keels scabrous; with 0.33 of their length adorned. 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 Asia-temperate: Siberia.

NOTES Poeae. Alexeev 2001.

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