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Descriptions

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

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

Panicum trachyrhachis

HABIT Annual. Culms erect; 60–180 cm long; 3–6 -noded. Culm-nodes glabrous. Leaf-sheaths smooth; glabrous on surface, or pilose; outer margin glabrous. Ligule a ciliate membrane; 1.2–3 mm long. Leaf-blades flat, or involute; 12–45 cm long; 3–7 mm wide. Leaf-blade surface smooth, or scabrous; glabrous. Leaf-blade margins smooth.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 30–65 cm long. Primary panicle branches spreading; whorled at lower nodes; 15–30 cm long; bearing 40–100 fertile spikelets on each lower branch. Panicle axis scabrous. Panicle branches scabrous; glabrous in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.8–2.5 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; compressed slightly; 3.1–3.9 mm long; 1–1.1 mm wide; falling entire. Rhachilla internodes elongated between glumes. Rhachilla elongation 0.3–0.4 mm long.

GLUMES Glumes reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 2.1–2.9 mm long; 0.66–0.75 length of spikelet; membranous; without keels; 3–5 -veined. Lower glume lateral veins thickened. Lower glume apex acute, or acuminate; awned; 1 -awned. Lower glume awn 0.8–1.2 mm long. Upper glume lanceolate; 1 length of spikelet; membranous; without keels; 7 -veined. Upper glume inner surface pubescent (at tip). Upper glume apex acute; muticous, or awned; 1 -awned. Upper glume awn 0–1 mm long.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; lanceolate; 1 length of spikelet; membranous; 9 -veined; acute, or acuminate; mucronate. Fertile lemma elliptic; dorsally compressed; 2.1–2.4 mm long; indurate; without keel. Lemma lateral veins distinct. Lemma margins involute. Lemma apex obtuse. Palea involute; indurate.

FLOWER Anthers 3; 1.1–1.4 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Indo-China, Malesia, and Papuasia. Australasia: Australia.

NOTES Paniceae. Webster 1993.

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