Dissanthelium macusaniense

HABIT Annual. Culms slender; 3–7 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.7–1.7 mm long. Leaf-blades ascending; involute; 1–4 cm long; 1–2 mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle; shorter than basal leaves.

Panicle spiciform; oblong; 1–2 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; 3.3–4.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.3–0.4 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate, or oblong; 1 length of upper glume; membranous; much thinner on margins; 1-keeled; 3 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume apex acute. Upper glume oblong, or ovate; 3.3–4.2 mm long; 1.3–1.5 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 3 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume apex acute.

FLORETS Fertile lemma ovate; 2.5–2.8 mm long; chartaceous; much thinner above; keeled; 3 -veined. Lemma lateral veins close to margins. Lemma surface puberulous. Lemma apex dentate; 3 -fid; with outer lobes shorter; acute. Palea keels ciliolate.

FLOWER Anthers 3; 0.3 mm long. Ovary glabrous.

FRUIT Endosperm farinose.

DISTRIBUTION South America: western South America.

NOTES Aveneae. Swallen.

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