Erioneuron Nash
  • J.K.Small, Fl. S.E. U.S.: 143 (1903) 

Notes: Distribution: WC. & C. U.S.A. to Mexico, Bolivia to Argentina

General Description

HABIT Perennial. Stolons absent (3), or present (1). Culms 2-25.87-60 cm long. Ligule a fringe of hairs. Leaf-blades aciculate (1), or linear (3). Leaf-blade margins cartilaginous (3/3). INFLORESCENCE Inflorescence a panicle; terminal (3), or terminal and axillary (1); subtended by an unspecialized leaf-sheath (3), or an inflated leaf-sheath (1); exserted (3), or embraced at base by subtending leaf (1). Panicle spiciform (1), or capitate (3). Spikelets solitary. Fertile spikelets sessile (1), or pedicelled (3). Pedicels linear (3/3). FERTILE SPIKELETS Spikelets comprising 3 fertile florets (1), or 4-6 fertile florets (2), or 7-8 fertile florets (3), or 9-12 fertile florets (2), or 13-18 fertile florets (1); with diminished florets at the apex. Spikelets oblong; laterally compressed; 5-10.5-16 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose (3/3). GLUMES Glumes persistent; shorter than spikelet, or reaching apex of florets (3). Lower glume ovate; 0.9-0.975-1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate; muticous (3), or mucronate (1). Upper glume ovate; 1-1.275-2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume apex acuminate; muticous (3), or mucronate (1). FLORETS Fertile lemma ovate (3), or obovate (1); membranous; without keel; 3 -veined. Lemma lateral veins excurrent (1/1). Lemma surface pilose. Lemma margins ciliate. Lemma apex entire (1), or lobed (3); 2 -fid (3/3); incised 0.4-0.4333-0.5 of lemma length; emarginate (1/2), or truncate (1/2), or obtuse (1/2); awned; 1 -awned. Principal lemma awn from a sinus; straight, or curved (1). Palea 0.5 length of lemma; 2 -veined (3/3). Palea keels eciliate (1), or ciliolate (3). Palea surface glabrous (1), or pilose (3). Apical sterile florets resembling fertile though underdeveloped. FRUIT Caryopsis with adherent pericarp (3/3); ovoid (3/3); laterally compressed (3/3); smooth (3/3). Embryo 0.5 length of caryopsis. CLEISTOGENES AND VIVIPARY Cleistogenes absent (3), or present (1); in lower sheaths (1/1). DISTRIBUTION North America, or South America (2).

Distribution Map

  • Native distribution
Found in
  • Northern America Mexico Mexico Central
  • Mexico Gulf
  • Mexico Northeast
  • Mexico Southwest
  • North-Central U.S.A. Kansas
  • Oklahoma
  • Northwestern U.S.A. Colorado
  • South-Central U.S.A. New Mexico
  • Texas
  • Southwestern U.S.A. Arizona
  • California
  • Nevada
  • Utah
  • Southern America Southern South America Argentina Northeast
  • Argentina Northwest
  • Argentina South
  • 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.