Tetrapogon Desf.
  • Fl. Atlant. 2: 388 (1799) 


General Description

HABIT Annual (2), or perennial. Rhizomes absent (3), or short (2). Culms erect (4), or geniculately ascending (4), or decumbent (1); 15-49.9-104 cm long. Ligule a ciliolate membrane. Leaf-blades filiform (1), or linear (4). INFLORESCENCE Inflorescence composed of racemes; subtended by an unspecialized leaf-sheath (4), or an inflated leaf-sheath (1); exserted (4), or embraced at base by subtending leaf (1). Racemes single (2), or paired (4), or digitate (1); side by side (4), or appressed back to back (1); erect (1), or ascending (4); unilateral. Rhachis angular (4/4). Spikelet packing broadside to rhachis; 2 -rowed (4/4). Spikelets ascending (4/4); solitary. Fertile spikelets sessile. FERTILE SPIKELETS Spikelets comprising 1 fertile florets (2), or 2 fertile florets (1), or 3 fertile florets (4), or 4-5 fertile florets (3), or 6-7 fertile florets (1); with diminished florets at the apex. Spikelets cuneate; laterally compressed; 2-5.1-12 mm long; breaking up at maturity; disarticulating below each fertile floret (1), or above glumes but not between florets (4). Floret callus pilose. GLUMES Glumes persistent; shorter than spikelet (2), or reaching apex of florets (1), or exceeding apex of florets (3); thinner than fertile lemma; gaping. Lower glume lanceolate; 0.6-0.731-0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute (1), or acuminate, or setaceously attenuate (2); muticous, or mucronate (1). Upper glume lanceolate (4), or ovate (1); 0.8-1.47-2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume apex truncate (1), or obtuse (1), or acute (2), or acuminate (4), or setaceously attenuate (2); muticous (4), or mucronate (2). FLORETS Fertile lemma elliptic (1), or ovate (2), or obovate (1), or cuneate (1); laterally compressed (1/1); elliptic in profile (1/1); coriaceous; of similar consistency on margins (4), or much thinner on margins (1); keeled; wingless (4), or winged on margins (1); 3 -veined. Lemma midvein eciliate (2), or ciliate (3). Lemma surface glabrous (4), or pubescent (1); without hair tufts (4), or with conspicuous apical hairs (1). Lemma margins eciliate (2), or ciliolate (1), or ciliate (3). Lemma apex entire (4), or dentate (1); 2 -fid (1/1); obtuse (1/4), or acute (3/4); awned; 1 -awned. Principal lemma awn subapical. Palea 2 -veined (4/4). Palea keels eciliate (1), or ciliolate (4). Apical sterile florets 1 in number (2), or 2 in number (4), or 3 in number (3), or 4-6 in number (1); barren; separate (1), or in a clump (4); elliptic (1), or cuneate (4). Apical sterile lemmas muticous (1), or awned (4). FLOWER Lodicules 2 (1/1); fleshy (1/1). Anthers 3 (1/1). Stigmas 2 (1/1). FRUIT Caryopsis with adherent pericarp (1), or free soft pericarp (4); oblong (3/4), or obovoid (1/4); dorsally compressed (4/4); biconvex (4), or trigonous (1). Hilum punctiform (1/1). DISTRIBUTION Africa, or Temperate Asia (3), or Tropical Asia (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.