Agenium Nees
  • J.Lindley, Intr. Nat. Syst. Bot., ed. 2: 447 (1836) 

Notes: Distribution: Bolivia to Brazil and NE. Argentina

General Description

HABIT Perennial. Culms erect; slender (1/1); 15-65.83-120 cm long. Ligule an eciliate membrane (2), or a ciliolate membrane (1). Leaf-blades stiff (1), or firm (2). INFLORESCENCE Inflorescence composed of racemes; terminal (2), or terminal and axillary (1). Racemes single (1), or paired (1), or digitate (2); erect (1), or drooping (2). Rhachis fragile at the nodes; flattened. Rhachis internodes linear. Rhachis internode tip oblique; flat. Raceme-bases brief (1), or filiform (1), or linear (1). Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform. STERILE SPIKELETS Basal sterile spikelets well-developed. Companion sterile spikelets well-developed; separately deciduous. Companion sterile spikelet callus square (2), or cuneate (1). FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets linear (2), or lanceolate (1); subterete; 5-6.782-8 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus cuneate (1), or linear (2); pilose (1), or bearded (2); base pungent; attached obliquely. GLUMES Glumes exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate (2), or elliptic (1); coriaceous; without keels; 8 -veined. Lower glume surface with a longitudinal median groove; pubescent (2), or pilose (1). Lower glume apex obtuse. Upper glume lanceolate; coriaceous; without keels. Upper glume apex obtuse. FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic (2), or oblong (1); hyaline; 2 -veined (1/1); truncate (2/2). Fertile lemma linear; cartilaginous; without keel; 1 -veined. Lemma apex acute; awned; 1 -awned. Principal lemma awn geniculate. Column of lemma awn glabrous (1), or pubescent (2). Palea absent or minute. DISTRIBUTION South America.

Distribution Map

  • Native distribution
Found in
  • Southern America Brazil Brazil Northeast
  • Brazil South
  • Brazil Southeast
  • Brazil West-Central
  • Southern South America Argentina Northeast
  • Paraguay
  • Uruguay
  • Western South America Bolivia


  • 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. [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
  • 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; Retrieved 2011 onwards
  • C See 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.