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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 longispicata

HABIT Perennial; caespitose; clumped loosely. Rhizomes elongated. Culms geniculately ascending; 35–90 cm long; 3 mm diam.; 5 -noded. Culm-internodes distally glabrous. Culm-nodes bearded. Leaf-sheaths longer than adjacent culm internode; hispid; with tubercle-based hairs. Ligule an eciliate membrane; 0.5 mm long. Leaf-blades 24–33 cm long; 7–8 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface hispid; with tubercle-based hairs. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; bearing juvenile spikelets at emergence.

Panicle open; lanceolate; 30–50 cm long. Primary panicle branches ascending; whorled at most nodes; 10–20 cm long. Panicle axis scabrous.

Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels filiform; unequal; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 4.7–4.8 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus pilose. Spikelet callus hairs 0.5 length of spikelet.

GLUMES Glumes persistent; dissimilar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 4.2 mm long; 0.9 length of upper glume; membranous; light brown; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume surface glabrous. Upper glume ovate; 4.2–4.8 mm long; membranous; light brown; 1-keeled; 5 -veined. Upper glume primary vein scabrous. Upper glume surface glabrous.

FLORETS Basal sterile florets male; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; ovate; 4.2 mm long; membranous; 1-keeled; 5 -veined. Fertile lemma ovate; 2.4 mm long; coriaceous; without keel. Lemma apex awned; 1 -awned. Principal lemma awn geniculate; 3.5 mm long overall; with twisted column.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinelleae. Fl China 2003.

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