Trachys Pers.
  • Syn. Pl. 1: 85 (1805) 


General Description

HABIT Annual, or perennial (1). Culms geniculately ascending (1), or decumbent; 15-26.25-40 cm long; rooting from lower nodes (1/1). Ligule an eciliate membrane (1), or a fringe of hairs (1). Leaf-blades linear, or lanceolate (1). INFLORESCENCE Inflorescence composed of racemes. Racemes single (1), or paired, or digitate (1); unilateral. Rhachis fragile at the nodes; broadly winged; foliaceous. Spikelets in threes (1), or subtended by an involucre (1). Fertile spikelets sessile; 2 in the cluster (1), or 3 in the cluster, or 4-6 in the cluster (1). Companion sterile spikelets sessile (1/1); 2-6 in the cluster (1/1). Involucre composed of imperfect spikelets (1/1). Pedicels oblong (1/1). STERILE SPIKELETS Companion sterile spikelets absent (1), or well-developed (1); deciduous with the fertile (1/1). FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 3-4.3-6 mm long; falling entire; deciduous with accessory branch structures. GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume subulate (1), or ovate (1); coriaceous (1/1); 0 -veined (1/1). Lower glume lateral veins absent (1), or distinct (1). Upper glume lanceolate; 0.5-0.65-0.8 length of adjacent fertile lemma; membranous (1), or chartaceous (1); 3 -veined. Upper glume apex acute, or acuminate (1). FLORETS Basal sterile florets barren; with palea (1), or without significant palea (1). Lemma of lower sterile floret lanceolate (1), or ovate; coriaceous; 9-10 -veined (1), or 11-13 -veined; acute (1), or cuspidate (1). Palea of lower sterile floret membranous (1/1). Fertile lemma ovate; chartaceous (1), or cartilaginous (1); of similar consistency on margins (1), or much thinner on margins (1); without keel; 3 -veined (1), or 5 -veined (1). Lemma apex acute. Palea cartilaginous. FLOWER Lodicules 2 (1/1); membranous (1/1). Anthers 3 (1/1). FRUIT Caryopsis with adherent pericarp (1/1); oblong (1/1). Embryo 0.5 length of caryopsis. Hilum punctiform (1/1). DISTRIBUTION Tropical Asia.

  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.