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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Arundinella barbinodis

HABIT Perennial; caespitose; clumped loosely. Culms erect; 100 cm long; 3 mm diam.; 1–2 -noded. Culm-internodes smooth. Culm-nodes swollen; bearded. Leaf-sheaths longer than adjacent culm internode; pilose; outer margin hairy. Ligule a ciliolate membrane; 0.5 mm long. Leaf-blades 5–35 cm long; 3–7 mm wide; glaucous. Leaf-blade surface pubescent; hairy on both sides. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 30–60 cm long. Primary panicle branches ascending, or spreading; 1–2 -nate; 9–20 cm long. Panicle branches scaberulous; bearded in axils.

Spikelets solitary, or in pairs. Fertile spikelets pedicelled. Pedicels 1–6 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; 4.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose; obtuse. Floret callus hairs 0.25 length of lemma.

GLUMES Glumes persistent; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 3.5–4 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3–5 -veined. Lower glume surface smooth, or asperulous; rough on veins. Lower glume apex acuminate. Upper glume ovate; 4.5–5.5 mm long; membranous; glaucous; 1-keeled; 7 -veined. Upper glume surface smooth, or asperulous; rough on veins. Upper glume apex acuminate.

FLORETS Basal sterile florets barren; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; ovate; 4 mm long; membranous; glaucous; 1-keeled; 5 -veined; acute. Fertile lemma lanceolate; 2.5–3 mm long; coriaceous; light brown; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface asperulous. Lemma margins involute; interlocking with palea keels. Lemma apex awned; 3 -awned. Principal lemma awn straight; 6 mm long overall. Lateral lemma awns 2 mm long. Palea coriaceous; 2 -veined. Palea surface asperulous.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinelleae. Keng 1996.

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