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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 intricata

HABIT Perennial; caespitose. Rhizomes elongated. Culms erect, or geniculately ascending; 30–60 cm long. Culm-nodes glabrous. Leaf-sheaths glabrous on surface; outer margin hairy. Ligule a ciliate membrane. Leaf-blades involute; 10–20 cm long; 2–3 mm wide; coriaceous; stiff. Leaf-blade margins ciliate. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; bearing juvenile spikelets at emergence.

Panicle open; lanceolate, or ovate; dense; 5–13 cm long; contracted about primary branches. Panicle axis pilose.

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

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 4–4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent; obtuse.

GLUMES Glumes persistent; dissimilar; reaching apex of florets; thinner than fertile lemma; gaping. Lower glume elliptic; 3 mm long; 0.75 length of upper glume; membranous; purple; 1-keeled; 3–5 -veined. Lower glume surface smooth; glabrous. Lower glume apex acute. Upper glume elliptic; 4–4.5 mm long; 2 length of adjacent fertile lemma; 1 length of spikelet; membranous; 1-keeled; 5 -veined. Upper glume surface scabrous; rough on veins. Upper glume apex acuminate.

FLORETS Basal sterile florets male; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; elliptic; 4–4.5 mm long; 1 length of spikelet; membranous; 1-keeled; 5 -veined; acute. Fertile lemma elliptic, or oblong; 2–3 mm long; coriaceous; pallid; 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; 5–6 mm long overall; with twisted column. Palea with auriculate flaps; coriaceous; 2 -veined. Palea surface asperulous.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 1 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: China. Asia-tropical: India.

NOTES Arundinelleae. Bor 1993.

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