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Descriptions

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

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

Arthraxon junnarensis

HABIT Annual. Culms rambling; weak; 10–20 cm long; rooting from lower nodes. Culm-nodes pubescent. Leaf-sheaths 0.5–1.75 cm long; pilose; with tubercle-based hairs. Ligule a ciliolate membrane; 0.7 mm long. Leaf-blade base broadly rounded. Leaf-blades lanceolate, or ovate; 1–2.5 cm long; 5–7.5 mm wide. Leaf-blade surface pilose; with tubercle-based hairs.

INFLORESCENCE Inflorescence composed of racemes. Peduncle 2–3 cm long; glabrous.

Racemes 5–12; digitate; 1–1.75 cm long. Rhachis fragile at the nodes; ciliate on margins. Rhachis internodes filiform; 1.25–1.8 mm long.

Spikelets solitary. Fertile spikelets sessile. Pedicels filiform; 0.1–0.6 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 1.5–2 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus glabrous, or pubescent; base truncate; attached transversely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate, or ovate; 1 length of spikelet; chartaceous; without keels; 5 -veined. Lower glume lateral veins obscure. Lower glume surface scabrous; rough above. Upper glume lanceolate; chartaceous; 1-keeled; keeled above; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline; 0 -veined; without midvein; without lateral veins. Fertile lemma lanceolate; 1 mm long; hyaline; without keel; 1 -veined. Lemma apex entire, or dentate; 2 -fid; acute; awned; 1 -awned. Principal lemma awn dorsal; arising 0.2 way up back of lemma; geniculate; 4–5 mm long overall; with twisted column. Column of lemma awn glabrous. Palea absent or minute.

FLOWER Anthers 2; 0.3–0.5 mm long.

FRUIT Caryopsis with adherent pericarp; linear; 1.2 mm long.

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

NOTES Andropogoneae. Jain 1993.

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