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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 gouinii

HABIT Perennial. Rhizomes elongated; scaly. Culms erect; 10–50 cm long. Culm-internodes 2.1–5.5 cm long; distally glabrous. Culm-nodes glabrous, or pubescent. Leaf-sheaths 2.7–5.5 cm long; outer margin glabrous, or hairy. Ligule a ciliolate membrane; 0.4–0.8 mm long. Collar dark; glabrous. Leaf-blades 4.5–13 cm long; 2–4 mm wide. Leaf-blade midrib evident; keeled beneath. Leaf-blade surface glabrous. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate; 5.4–10 cm long; 1–6 cm wide; bearing few spikelets. Panicle axis angular; scaberulous; glabrous. Panicle branches glabrous in axils.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels 1–4.5 mm long; scabrous; glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 2.4–2.9 mm long; 0.9–1.1 mm wide; falling entire.

GLUMES Glumes reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 1–1.6 mm long; 0.4–0.6 length of spikelet; membranous; without keels; 1–7 -veined. Lower glume apex acute. Upper glume ovate; 2.2–2.7 mm long; 1 length of spikelet; membranous; without keels; 9–11 -veined. Upper glume apex acute.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 2.2–2.7 mm long; 1 length of spikelet; membranous; 9–11 -veined; acute. Palea of lower sterile floret 2–2.4 mm long. Fertile lemma ovate; dorsally compressed; 1.9–2.1 mm long; 0.8–1 mm wide; indurate; yellow; shiny; without keel; 7 -veined. Lemma margins involute. Palea involute; indurate.

FLOWER Anthers 3; 1.5 mm long; orange.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1.5 mm long; dark brown. Embryo 0.4 length of caryopsis. Hilum elliptic.

DISTRIBUTION North America: southeast USA and Mexico. South America: Caribbean, Brazil, and southern South America.

NOTES Paniceae. Zuloaga 1995.

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