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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Briza itatiaiae

HABIT Perennial; caespitose. Culms erect; 50–70 cm long; 1 mm diam.; 2 -noded; with 0.5 of their length below uppermost node. Culm-internodes terete; striate; smooth; distally glabrous. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths mostly shorter than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane; 1 mm long. Leaf-blades conduplicate; 15–30 cm long; 2.5 mm wide. Leaf-blade venation with 10–12 secondary veins. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 13–18 cm long; 10 cm wide; with spikelets clustered towards branch tips. Primary panicle branches spreading; 2 -nate.

Spikelets in pairs. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–4 fertile florets; with diminished florets at the apex. Spikelets obovate; laterally compressed; 2.5–3 mm long; 2.5 mm wide; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 2.5–2.8 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scaberulous. Lower glume apex acute. Upper glume oblong; 2.5–2.8 mm long; 1.2–1.4 length of adjacent fertile lemma; membranous; 1-keeled; 5 -veined. Upper glume primary vein scaberulous. Upper glume apex acute.

FLORETS Fertile lemma orbicular; 2 mm long; cartilaginous; much thinner on margins; keeled; 5 -veined. Lemma lateral veins obscure. Lemma surface tuberculate. Lemma apex obtuse. Palea oblong; 2 -veined. Palea keels scabrous. Palea apex emarginate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; ovate; membranous; acute. Anthers 1; 0.8 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; oblong; trigonous; sulcate on hilar side; 1.3 mm long; light brown. Hilum elliptic.

DISTRIBUTION South America: Brazil.

NOTES Poeae. Ekman 2001.

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