Trichoneura Andersson
  • Kongl. Svenska Vetensk. Acad. Handl. 1853: 148 (1855) 


General Description

HABIT Annual (6), or perennial (2). Culms erect (2/7), or geniculately ascending (6/7), or decumbent (5/7); 3-41-110 cm long; rooting from lower nodes (1/1). Ligule an eciliate membrane. Leaf-blades persistent (7), or deciduous at the ligule (1); stiff (1), or firm (7). INFLORESCENCE Inflorescence composed of racemes; not deciduous as a whole (7), or deciduous as a whole (1). Peduncle persistent (7), or fracturing (1). Racemes borne along a central axis; appressed (1), or ascending (6), or spreading (3); unilateral; bearing 8-9 fertile spikelets on each (1/1). Rhachis persistent (6), or deciduous from axis (2); angular. Spikelet packing broadside to rhachis; contiguous (7), or distant (1). Spikelets appressed (7/7); solitary. Fertile spikelets sessile (3), or pedicelled (5). Pedicels oblong (4/4). FERTILE SPIKELETS Spikelets comprising 4 fertile florets (4), or 5-6 fertile florets, or 7-8 fertile florets (4), or 9 fertile florets (2); with diminished florets at the apex. Spikelets cuneate; laterally compressed; 4-6.887-14 mm long; falling entire (2), or breaking up at maturity (6); deciduous with accessory branch structures (2/2); disarticulating below each fertile floret (6/6). Rhachilla internodes glabrous (5), or pilose (3). Floret callus pubescent (6/7), or pilose (1/7). GLUMES Glumes persistent (6/6); shorter than spikelet (5), or reaching apex of florets (4), or exceeding apex of florets (1); gaping. Lower glume linear (2), or lanceolate (7), or oblong (1); 0.75-0.9125-1.2 length of upper glume; membranous; without keels (2), or 1-keeled (6); 1 -veined. Lower glume lateral veins absent. Lower glume surface smooth (3), or asperulous (2), or scabrous (3). Lower glume apex acute (1), or acuminate (1), or attenuate (5), or setaceously attenuate (1); muticous (5), or awned (3). Upper glume linear (1), or lanceolate (6), or elliptic (1), or oblong (1); 1.25-1.778-2.3 length of adjacent fertile lemma; membranous; without keels (2), or 1-keeled (6); 1 -veined. Upper glume surface smooth (3), or asperulous (2), or scabrous (3). Upper glume apex acute (1), or acuminate (1), or attenuate (5), or setaceously attenuate (1); muticous (5), or awned (3); 1 -awned (3/3). FLORETS Fertile lemma elliptic (1), or oblong; membranous; without keel (2), or keeled; 3 -veined. Lemma midvein without distinctive roughness (7), or scaberulous (1). Lemma surface glabrous (4), or puberulous (1), or pilose (3). Lemma margins ciliate. Lemma apex dentate; 2 -fid; obtuse (3/3); mucronate (1), or awned (7); 1 -awned (7/7). Principal lemma awn apical (1), or from a sinus (7). Palea 1 length of lemma; 2 -veined. Palea surface glabrous (7), or pubescent (3). Apical sterile florets resembling fertile though underdeveloped. FLOWER Anthers 3 (7/7). FRUIT Caryopsis with adherent pericarp (3/3); linear (1/3), or lanceolate (1/3), or ellipsoid (2/3), or oblong (2/3); dorsally compressed (3/3); plano-convex (3/3), or concavo-convex (3/3). DISTRIBUTION Africa (5), or Temperate Asia (1), or North America (1), or South America (2).

  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.