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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 pubescens

HABIT Perennial; caespitose. Culms slender; 20–35 cm long; 0.8–1 mm diam.; 4–6 -noded. Culm-internodes distally hirsute. Culm-nodes pubescent. Leaves mostly basal. Leaf-sheaths 2–6 cm long; hirsute. Ligule a ciliolate membrane. Leaf-blades 3–10 cm long; 4–6 mm wide; stiff. Leaf-blade surface hirsute; hairy on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; bearing juvenile spikelets at emergence.

Panicle open; lanceolate, or oblong; 12–25 cm long; 1.5–3 cm wide. Primary panicle branches 1.5–4 cm long. Panicle axis glabrous, or pubescent. Panicle branches scabrous.

Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose; obtuse.

GLUMES Glumes persistent; dissimilar; exceeding apex of florets; thinner than fertile lemma; recurved at apex. Lower glume lanceolate, or ovate; 2.3–2.5 mm long; 0.66 length of upper glume; chartaceous; 1-keeled; 5 -veined. Lower glume primary vein scabrous. Lower glume apex acute. Upper glume lanceolate, or ovate; 2.5 length of adjacent fertile lemma; 1 length of spikelet; chartaceous; 1-keeled; 5 -veined. Upper glume apex caudate.

FLORETS Basal sterile florets male; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; lanceolate, or ovate; 3 mm long; chartaceous; 1-keeled; 3 -veined; acute. Fertile lemma lanceolate; 2–2.2 mm long; chartaceous; without keel; 3 -veined. Lemma lateral veins obscure. Lemma surface asperulous. Lemma margins involute; interlocking with palea keels. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 4.5–5 mm long overall; with twisted column. Palea with auriculate flaps; chartaceous; 2 -veined. Palea surface asperulous.

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

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: eastern Asia. Asia-tropical: Malesia and Papuasia.

NOTES Arundinelleae. Ohwi 1993.

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