Otachyrium Nees
  • C.F.P.von Martius, Fl. Bras. Enum. Pl. 2: 271 (1829) 


Notes: Distribution: S. Trop. America

General Description

HABIT Annual (1), or perennial (7). Rhizomes absent (3), or short (3), or elongated (2). Culms erect (6), or decumbent (2); robust (1/1); 10-56.18-150 cm long; spongy (1), or firm (7); without nodal roots (2/4), or rooting from lower nodes (2/4). Culm-nodes constricted (4/5), or swollen (1/5). Lateral branches lacking (4/5), or sparse (1/5), or ample (1/5). Ligule an eciliate membrane (6), or a ciliolate membrane (2), or absent (1). Leaf-blades filiform (1), or linear (6), or lanceolate (2); stiff (1), or firm (7). Leaf-blade midrib indistinct (1/1). INFLORESCENCE Inflorescence a panicle; terminal (7), or terminal and axillary (1). Panicle open (5), or contracted (3). Spikelets solitary (1), or in pairs (7). Fertile spikelets pedicelled; 2 in the cluster (7/7). Pedicels tip discoid (2/4), or cupuliform (2/4). FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate, or orbicular (1); laterally compressed (2), or dorsally compressed (6); symmetrical (5), or gibbous (3); 1.66-2.747-7.5 mm long; falling entire. GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume ovate; membranous; without keels (3/7), or 1-keeled (4/7); 1 -veined (7/7), or 2-3 -veined (5/7), or 4-5 -veined (2/7). Lower glume lateral veins absent (3), or distinct (6). Lower glume apex obtuse (2/7), or acute (5/7). Upper glume oblong (1), or ovate (3), or orbicular (4); 0.33-0.3725-0.5 length of adjacent fertile lemma; membranous; without keels (5), or 1-keeled (3); 3 -veined (2/7), or 5 -veined (5/7), or 6-7 -veined (3/7). Upper glume apex truncate (3/7), or obtuse (1/7), or acute (3/7). FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret oblong (1), or ovate (7); membranous (1), or chartaceous (6), or coriaceous (1); 3 -veined (7/7), or 4-7 -veined (1/7); without grooves (5), or sulcate (3); obtuse (1), or acute (7). Palea of lower sterile floret hyaline (1), or becoming indurate on keels at maturity (7); winged on keels, or winged on margins (4). Fertile lemma ovate; not gibbous (7), or gibbous (1); chartaceous (2), or coriaceous (1), or indurate (5); without keel (7), or keeled (1); 3 -veined (5/6), or 5 -veined (1/6). Lemma lateral veins obscure (2/2). Lemma surface smooth (7), or papillose (1). Lemma margins involute. Lemma apex acute (6/7), or cuspidate (1/7); without ornament (7), or laterally pinched (1). Palea membranous (1), or chartaceous (1), or coriaceous (1), or indurate (5); 0 -veined (1/1). FRUIT Caryopsis with adherent pericarp; ovoid (6/7), or obovoid (1/7); dorsally compressed (1/1); plano-convex (1/1). Embryo 0.5 length of caryopsis. Hilum elliptic (6/6). DISTRIBUTION South America.

Distribution Map

 
  • Native distribution
Found in
  • Southern America Brazil Brazil North
  • Brazil Northeast
  • Brazil South
  • Brazil Southeast
  • Brazil West-Central
  • Northern South America French Guiana
  • Guyana
  • Suriname
  • Venezuela
  • Southern South America Argentina Northeast
  • Paraguay
  • Western South America Bolivia
  • Colombia

  Bibliography

  • 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
http://www.kew.org/data/grasses-db/
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
http://e-monocot.org
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
http://apps.kew.org/wcsp/
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.