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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 buncei

HABIT Perennial; caespitose. Rootstock evident. Basal innovations extravaginal. Culms slender; 30–80 cm long; 3–4 -noded. Culm-nodes glabrous, or pubescent. Lateral branches lacking, or sparse. Leaf-sheaths glabrous on surface, or pilose; with tubercle-based hairs. Ligule a ciliolate membrane; 0.75 mm long. Leaf-blades flat, or conduplicate, or involute; 10–20 cm long; 1.5–5 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy; hairy abaxially; with tubercle-based hairs. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; nodding; 7–30 cm long. Primary panicle branches ascending, or spreading; 1–2 -nate; profusely divided; 5–17 cm long. Panicle branches capillary; glabrous in axils.

Spikelets in pairs. Fertile spikelets pedicelled. Pedicels 1–3 mm long; tip cupuliform.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or ovate; dorsally compressed; acute, or acuminate; 3–4.5 mm long; falling entire. Rhachilla internodes elongated between glumes.

GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume oblate; clasping; gibbous; 0.25–0.33 length of spikelet; membranous; without keels; 5–7 -veined. Lower glume lateral veins obscure. Lower glume apex obtuse. Upper glume ovate; 0.9 length of spikelet; membranous; without keels; 5–7 -veined. Upper glume lateral veins prominent. Upper glume apex acute, or acuminate.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 7–9 -veined; prominently veined; acute. Palea of lower sterile floret 0.75 length of lemma. Fertile lemma elliptic, or oblong; dorsally compressed; 1.7–2 mm long; indurate; pallid, or light brown; shiny; without keel; 7 -veined. Lemma lateral veins obscure. Lemma margins involute. Lemma apex acute. Palea involute; indurate.

FLOWER Anthers 3; 1.25 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Australasia: Australia.

NOTES Paniceae. Fl NSW 1993.

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