Ortachne Nees ex Steud.
  • Syn. Pl. Glumac. 1: 121 (1854) 

Notes: Distribution: Costa Rica to Peru, S. Chile to S. Argentina

General Description

HABIT Perennial. Rhizomes absent (1), or elongated (2). Culms erect; 12-25.66-44 cm long. Ligule an eciliate membrane. Leaf-blades aciculate (1), or filiform; stiff. Leaf-blade apex muticous (1), or pungent (2). INFLORESCENCE Inflorescence a panicle. Panicle open (2), or contracted (1). Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear. FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 2.075-3.779-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pubescent (2), or pilose (1); acute. GLUMES Glumes persistent; shorter than spikelet; thinner than fertile lemma (2), or similar to fertile lemma in texture (1). Lower glume oblong; 1-1.033-1.1 length of upper glume; hyaline (2), or membranous (1); without keels; 0 -veined (1), or 1 -veined, or 2-3 -veined (1). Lower glume lateral veins absent, or obscure (1). Lower glume apex emarginate, or truncate. Upper glume oblong; 0.5-0.7333-0.9 length of adjacent fertile lemma; hyaline (2), or membranous (1); without keels; 0 -veined (2), or 1 -veined, or 2-3 -veined (1). Upper glume apex entire, or erose (2); emarginate (1), or truncate (1), or obtuse (2). FLORETS Fertile lemma elliptic; membranous; without keel (1), or keeled (2); 3 -veined (1), or 5 -veined (2). Lemma midvein without distinctive roughness (2), or scabrous (1); eciliate (1), or pubescent (2). Lemma lateral veins obscure (2/2). Lemma surface smooth (2), or scaberulous (1). Lemma margins eciliate (2), or ciliate (2). Lemma apex entire (1), or dentate (2); 2 -fid (2/2); acuminate; awned; 1 -awned. Principal lemma awn straight (1), or curved (2), or flexuous (1). Palea 0.9-0.9667-1 length of lemma; 2 -veined; without keels. Palea surface glabrous (2), or pubescent (1), or pilose (1). FLOWER Lodicules 2 (1), or 3 (2); membranous; truncate (1/2), or obtuse (1/2). Anthers 3. FRUIT Caryopsis with adherent pericarp; fusiform (2/2); rugose (1/1). Hilum linear (1/1); 1 length of caryopsis. DISTRIBUTION South America.

Distribution Map

  • Native distribution
Found in
  • Southern America Central America Costa Rica
  • Northern South America Venezuela
  • Southern South America Argentina South
  • Chile South
  • Western South America Colombia
  • Ecuador
  • Peru


  • 1 Govaerts, R.H.A. (2011). World checklist of selected plant families published update. Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

 Information From

GrassBase - The Online World Grass Flora
Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora. http://www.kew.org/data/grasses-db.html. [accessed 24 January 2012; 14:30 GMT]
  • A © Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from http://e-monocot.org.
  • B Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
World Checklist of Selected Plant Families
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://apps.kew.org/wcsp/ Retrieved 2011 onwards
  • C See http://kew.org/about-kew/website-information/legal-notices/index.htm You may use data on these Terms and Conditions and on further condition that: The data is not used for commercial purposes; You may copy and retain data solely for scholarly, educational or research purposes; You may not publish our data, except for small extracts provided for illustrative purposes and duly acknowledged; You acknowledge the source of the data by the words "With the permission of the Trustees of the Royal Botanic Gardens, Kew" in a position which is reasonably prominent in view of your use of the data; Any other use of data or any other content from this website may only be made with our prior written agreement.