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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 nubigena

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms 30–80 cm long; 2–4 -noded. Lateral branches lacking. Leaf-sheaths smooth; glabrous on surface. Ligule a ciliolate membrane; 0.5 mm long. Leaf-blades conduplicate; 18–40 cm long; 1–2 mm wide. Leaf-blade venation with 3 secondary veins. Leaf-blade surface pilose; hairy adaxially. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above; glabrous to hirsute above.

Panicle open; lanceolate; 8–10 cm long. Primary panicle branches appressed; 1–3 -nate; 2–5 cm long. Panicle branches flexuous; scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–7 fertile florets; with diminished florets at the apex. Spikelets elliptic, or ovate; laterally compressed; 6–11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes scaberulous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 3.5–5 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, or acuminate. Upper glume ovate; 5–6 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, or acuminate.

FLORETS Fertile lemma lanceolate, or ovate; 6–7 mm long; chartaceous; without keel; 5 -veined. Lemma midvein scabrous. Lemma surface granulose; rough below. Lemma apex acute; awned; 1 -awned. Principal lemma awn 1 mm long overall. Palea 6.5–7 mm long; 2 -veined. Palea keels scabrous. Palea surface granular. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2. Anthers 3. Ovary glabrous, or with a few apical hairs.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1–1.3 mm long; glabrous. Hilum linear.

DISTRIBUTION Asia-tropical: Malesia and Papuasia.

NOTES Poeae. Alp Fl N Guin 1994.

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