Dissanthelium trollii

HABIT Perennial. Rhizomes short. Culms 3–5.5 cm long. Ligule an eciliate membrane; 0.5–1 mm long. Leaf-blades flat, or involute; 1.5–3 cm long; 1–2 mm wide. Leaf-blade surface scaberulous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; lanceolate; 1.3–2 cm long; 0.5 cm wide; bearing few spikelets. Primary panicle branches appressed.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; 4.5–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.3 mm long.

GLUMES Glumes persistent; similar; reaching apex of florets, or exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume lateral veins obscure. Lower glume apex acute. Upper glume ovate; 4.5–5 mm long; 1.1–1.2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume lateral veins obscure. Upper glume apex obtuse.

FLORETS Fertile lemma ovate; 4–4.3 mm long; chartaceous; keeled; 3 -veined. Lemma midvein without distinctive roughness. Lemma surface smooth; glabrous. Lemma apex obtuse.

FLOWER Anthers 3; 2–2.2 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.