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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 stipiflorum

HABIT Annual. Culms decumbent; 20–30 cm long. Culm-internodes terete; distally pubescent. Culm-nodes constricted; pubescent. Lateral branches ample; arising from upper culm. Leaf-sheaths pilose; outer margin hairy. Ligule a ciliate membrane; 0.3 mm long. Leaf-blade base amplexicaul. Leaf-blades lanceolate, or oblong; 2–6 cm long; 6–15 mm wide. Leaf-blade surface glabrous, or pilose. Leaf-blade margins cartilaginous; scabrous; tuberculate-ciliate.

INFLORESCENCE Inflorescence a panicle. Peduncle 10–20 cm long; glabrous.

Panicle open; ovate; effuse; 3–8 cm long; 2–5 cm wide. Panicle axis pilose. Panicle branches eglandular; pilose; pubescent in axils.

Spikelets solitary, or in pairs. Fertile spikelets pedicelled. Pedicels 0.6–2 mm long; ciliate.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2.2–2.6 mm long; 0.9 mm wide; falling entire. Rhachilla internodes elongated between glumes.

GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; not clasping; 0.5 length of spikelet; membranous; without keels; 3–5 -veined. Lower glume apex acute. Upper glume elliptic; 1.8–2.1 mm long; 0.8 length of spikelet; membranous; without keels; 7–9 -veined. Upper glume surface pubescent. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 7 -veined; pubescent; acute. Palea of lower sterile floret 1.5 mm long. Fertile lemma elliptic; dorsally compressed; 1.7–1.8 mm long; 0.7 mm wide; indurate; shiny; without keel; 5 -veined. Lemma margins involute. Lemma apex apiculate; pubescent. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1.5 mm long. Embryo 0.33 length of caryopsis. Hilum punctiform.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Zuloaga 1994.

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