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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 rupestris

HABIT Perennial. Culms 35–70 cm long. Leaf-sheaths pubescent. Ligule a ciliolate membrane. Leaf-blades involute; 15–20 cm long; 2–6 mm wide. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; bearing juvenile spikelets at emergence.

Panicle open; linear, or lanceolate; 3–15 cm long; 1.5–2 cm wide; contracted about primary branches. Primary panicle branches bearing spikelets almost to the base. Panicle axis scabrous. Panicle branches scabrous.

Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels 0.8–4 mm long; ciliate.

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 pubescent; obtuse.

GLUMES Glumes persistent; dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 3.5 mm long; 0.8–0.9 length of upper glume; membranous; 1-keeled; 5 -veined. Lower glume primary vein scaberulous. Lower glume apex acuminate. Upper glume ovate; 1.8 length of adjacent fertile lemma; 1 length of spikelet; membranous; 1-keeled; 5 -veined. Upper glume apex acute.

FLORETS Basal sterile florets male; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; ovate; 3.5–4 mm long; membranous; 1-keeled; 3 -veined; obtuse. Fertile lemma oblong; 2–2.2 mm long; coriaceous; 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; 2–3 mm long overall; with twisted column. Palea with auriculate flaps; 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. Asia-tropical: Indo-China.

NOTES Arundinelleae. Fl Indo Chine 1993.

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