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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 nutabundum

HABIT Annual. Culms decumbent; 10–20 cm long; rooting from lower nodes. Culm-internodes terete; 0.7–2 cm long; yellow, or purple; smooth; distally glabrous. Culm-nodes brown; pubescent. Lateral branches ample; arising from lower culm. Leaf-sheaths mostly shorter than adjacent culm internode; pilose; with tubercle-based hairs; outer margin hairy. Ligule an eciliate membrane; 0.4 mm long; brown. Collar glabrous, or pubescent. Leaf-blades ascending; lanceolate; 1–2.5 cm long; 2–4 mm wide. Leaf-blade surface hirsute. Leaf-blade margins smooth; tuberculate-ciliate; hairy at base. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle. Peduncle 5–10 cm long; glabrous.

Panicle open; ovate, or globose; effuse; 1.5–2.5 cm long; 1–2 cm wide. Panicle branches glabrous in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; tilted on the pedicel; dorsally compressed; obtuse, or subacute; 1.8–2 mm long; 1 mm wide; falling entire.

GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; not clasping; 0.8–1 mm long; 0.5 length of spikelet; membranous; without keels; 1–3 -veined. Lower glume lateral veins absent, or distinct. Lower glume apex acute. Upper glume elliptic; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume apex acute.

FLORETS Basal sterile florets male, or barren; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 5 -veined; acute. Palea of lower sterile floret 1.2–1.6 mm long. Fertile lemma elliptic; dorsally compressed; 1.5–1.6 mm long; 0.8 mm wide; indurate; without keel. Lemma surface papillose. Lemma margins involute. Palea involute; indurate.

FLOWER Lodicules 2; 0.2 mm long; truncate. Anthers 3; 0.8–1.2 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Zuloaga 2001.

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