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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 yemenensis

HABIT Perennial; caespitose; clumped densely. Culms 25–50 cm long; 1–1.5 mm diam.; 3–4 -noded; with 0.5 of their length below uppermost node. Leaf-sheaths tubular for much of their length; with 0.5 of their length closed; ribbed; scaberulous; glabrous on surface. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blades filiform; conduplicate; 40–55 cm long; 0.8 mm wide; glaucous. Leaf-blade venation with 7 secondary veins; 5 inner ridges; 9 subepidermal sclerenchyma strands; subepidermal sclerenchyma free from veins. Leaf-blade surface smooth; puberulous; hairy adaxially. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 10–13 cm long. Primary panicle branches appressed; 1–3 cm long. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

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

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3–3.5 mm long; 0.75 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous; rough at apex. Lower glume apex acute. Upper glume lanceolate; 4–5 mm long; 0.7–0.8 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume surface asperulous; rough at apex. Upper glume apex acute.

FLORETS Fertile lemma oblong; 5.5–6.5 mm long; chartaceous; without keel; 5 -veined. Lemma surface scaberulous; rough above. Lemma apex acute; awned; 1 -awned. Principal lemma awn 2.5–3.5 mm long overall. Palea 2 -veined. Palea keels smooth. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2. Anthers 3; 2.2–2.4 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION Asia-temperate: Arabia.

NOTES Poeae. Alexeev 1995.

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