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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 ephemeroides

HABIT Annual. Culms erect; 60–70 cm long. Culm-internodes distally glabrous. Culm-nodes glabrous. Leaf-sheaths striately veined and reticulately veined; glabrous on surface. Ligule a ciliate membrane; 2–2.5 mm long. Leaf-blades involute; 20–23 cm long; 2 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scaberulous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle; terminal and axillary. Axillary inflorescences similar to terminal. Peduncle 16–25 cm long; glabrous.

Panicle open; elliptic; effuse; 30 cm long; contracted about secondary branches. Primary panicle branches ascending. Panicle axis angular; smooth, or scaberulous. Panicle branches scabrous.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels clavate; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 3.5–3.6 mm long; 1–3 mm wide; falling entire.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma; gaping. Lower glume ovate; 2.8 mm long; 0.75 length of spikelet; membranous; without keels; 3(–5) -veined. Lower glume primary vein scaberulous. Lower glume apex setaceously attenuate. Upper glume ovate; 3.5–3.6 mm long; 1 length of spikelet; membranous; without keels; 5(–7) -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 3.5–3.6 mm long; 1 length of spikelet; membranous; 5 -veined; acuminate. Palea of lower sterile floret 2 mm long; 0.5 length of lemma. Fertile lemma elliptic; dorsally compressed; 2.1 mm long; 1.1 mm wide; indurate; dark brown; shiny; without keel; 5 -veined. Lemma margins involute. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 2.4 mm long; pallid. Embryo 0.33 length of caryopsis. Hilum elliptic.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Zuloaga 2001.

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