Paspalum lacustre

HABIT Perennial. Culms 75 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1–1.5 mm long; erose. Leaf-blades floating; 8–13 cm long; 2–5 mm wide.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2–7; digitate; unilateral; 3–7 cm long. Rhachis broadly winged; foliaceous; 1.7–2.4 mm wide. Spikelet packing abaxial; 2 -rowed.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or ovate; dorsally compressed; plano-convex; acuminate; 2.1–2.8 mm long; falling entire.

GLUMES Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume ovate; 1 length of spikelet; membranous; without keels; 5 -veined.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 1 length of spikelet; membranous; 5 -veined. Fertile lemma elliptic; 1.8–2.3 mm long; indurate; pallid; without keel. Lemma margins involute. Lemma apex obtuse; pubescent (sparsely). Palea involute; indurate.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: northern South America, western South America, and Brazil.

NOTES Paniceae. Fl Guiana 1995.

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