GrassBase - The Online World Grass Flora


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

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

Ortachne breviseta

HABIT Perennial; caespitose. Rhizomes elongated. Culms erect; 15–33 cm long; 0.5–1 mm diam.; 1–2 -noded. Leaves mostly basal. Ligule an eciliate membrane; 0.5–2 mm long; obtuse. Leaf-blades erect; filiform, or aciculate; conduplicate; 2–7 cm long; 0.5 mm wide; stiff. Leaf-blade apex acute; pungent.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 2–7 cm long; 0.5–1 cm wide.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear; 2–4 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 3.8–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5 mm long; pilose; acute.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume oblong; 3.7–4.3 mm long; 1–1.1 length of upper glume; hyaline; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex emarginate, or truncate. Upper glume oblong; 3.5–4 mm long; 0.8–0.9 length of adjacent fertile lemma; hyaline; without keels; 0–1 -veined. Upper glume primary vein absent, or distinct. Upper glume lateral veins absent. Upper glume apex entire, or erose; obtuse.

FLORETS Fertile lemma elliptic; 3.8–5 mm long; membranous; purple; keeled; 3 -veined. Lemma midvein pubescent. Lemma margins ciliate. Lemma apex dentate; 2 -fid; acuminate; awned; 1 -awned. Principal lemma awn curved; 4–4.5 mm long overall. Palea 1 length of lemma; 2 -veined; without keels. Palea surface pilose; hairy on back.

FLOWER Lodicules 2; 0.8–1.4 mm long; membranous; truncate. Anthers 3; 1.5 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Nicora.

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