Paractaenum P.Beauv.
  • Ess. Agrostogr.: 47 (1812) 


Notes: Distribution: Australia

General Description

HABIT Annual. Culms erect, or decumbent; 30-60 cm long. Ligule a ciliolate membrane. Leaf-blades flaccid. INFLORESCENCE Inflorescence composed of racemes. Racemes borne along a central axis; spreading, or deflexed; unilateral; bearing few fertile spikelets; bearing 1-4 fertile spikelets on each. Central inflorescence axis flattened. Rhachis deciduous from axis; narrowly winged; angular; terminating in a barren extension; extension subulate. Spikelet packing abaxial; distant. Raceme-bases cuneate. Spikelets appressed; subtended by an involucre. Fertile spikelets pedicelled; 1 in the cluster. Involucre composed of bristles. Involucral bristles deciduous with the fertile spikelets. Pedicels oblong. FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 3.5-5 mm long; falling entire; deciduous with accessory branch structures. GLUMES Glumes reaching apex of florets; thinner than fertile lemma. Lower glume ovate; membranous; without keels; 3-7 -veined. Lower glume apex truncate, or obtuse. Upper glume ovate; membranous; without keels; 11 -veined. Upper glume apex acute. FLORETS Basal sterile florets barren; with palea, or without significant palea. Lemma of lower sterile floret ovate; membranous; 9-11 -veined; acute. Fertile lemma elliptic; coriaceous; without keel. Lemma surface striate, or punctate. Lemma margins involute. Palea coriaceous. FLOWER Lodicules 2; fleshy; truncate. Anthers 3. DISTRIBUTION Australasia.

Distribution Map

 
  • Native distribution
Found in
  • Australasia Australia New South Wales
  • Northern Territory
  • Queensland
  • South Australia
  • Western Australia

  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.