Panicum trinii

HABIT Perennial; caespitose. Butt sheaths glabrous, or pilose. Culms erect; 150–200 cm long. Ligule a fringe of hairs. Leaf-blades flat, or convolute; 35–75 cm long; 6–15 mm wide; coriaceous; stiff. Leaf-blade surface pilose; hairy adaxially. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; 14–20 cm long. Primary panicle branches accrescent to a central axis; with evident branchlets on axis. Panicle axis with rounded ribs.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; dorsally compressed; 4.5–5.5 mm long; falling entire. Floret callus evident; 0.5 mm long; winged; with lateral wings; truncate.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume elliptic; 0.66–1 length of spikelet; membranous; without keels; 3 -veined. Lower glume surface glabrous, or pilose. Lower glume apex acute. Upper glume elliptic; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface glabrous, or pilose. Upper glume apex obtuse.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 5 -veined; obtuse. Fertile lemma oblong; dorsally compressed; 3.5–4 mm long; indurate; yellow; shiny; without keel. Lemma margins involute. Lemma apex obtuse. Palea involute; indurate.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. WDC.

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