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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 amurensis

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms erect; 15–30 cm long. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths open for most of their length; with 0.2–0.25 of their length closed. Ligule an eciliate membrane. Leaf-blades filiform; conduplicate; elliptic in section; 9–18 cm long; 0.45–0.6 mm wide; glaucous; pruinose. Leaf-blade venation comprising 5 vascular bundles; with 3 inner ridges; with sclerenchyma strands below veins; with 5 subepidermal sclerenchyma strands; with subepidermal sclerenchyma free from veins; without layer of subepidermal sclerenchyma masking vein striation. Leaf-blade surface scabrous; rough abaxially; puberulous; hairy adaxially. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate, or oblong; 3–5 cm long. Panicle branches flat; scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 5.5–6.5 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, or ovate; chartaceous; without keels; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3.5–3.7 mm long; chartaceous; without keel; 5 -veined. Lemma surface glabrous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 0.5–1.7 mm long overall. Palea 2 -veined. Palea keels scaberulous; with 0.25–0.33 of their length adorned. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2. Anthers 3; 1.4–1.6 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION Asia-temperate: Soviet far east.

NOTES Poeae. Alexeev 2001.

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