Tripsacum L.
  • Syst. Nat. ed. 10, 2: 1261 (1759) 


General Description

HABIT Perennial. Rhizomes absent (4), or short (8), or elongated (2). Culms erect (10), or geniculately ascending (7), or decumbent (2); robust (10/13), or of moderate stature (4/13); 50-283.4-500 cm long; without nodal roots (2/3), or with prop roots (3/3). Leaf-sheath auricles absent (13), or erect (1). Ligule a ciliolate membrane. Leaf-blade base without a false petiole (11), or with a false petiole (3). Leaf-blades linear (11), or lanceolate (3); herbaceous (13), or coriaceous (1). INFLORESCENCE Monoecious; with male and female spikelets in the same inflorescence. Inflorescence composed of racemes; terminal and axillary. Racemes single (5), or paired (4), or digitate (12); erect (7), or ascending (3), or spreading (1), or drooping (3); unilateral; bearing 4-12 fertile spikelets on each (1/1). Rhachis fragile at the nodes; subcylindrical and excavated. Spikelet packing abaxial. Rhachis internodes oblong; adherent to upper glume of sessile spikelet. Rhachis internode tip transverse; crateriform. Sexes segregated; on bisexual branches; with male above. Spikelets sunken; solitary. Fertile spikelets sessile. Male spikelets sessile (8), or sessile and pedicelled (8); 2 in a cluster. FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong (1), or ovate (13); dorsally compressed; 3-6.016-10 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus base truncate; with central peg; attached transversely. GLUMES Glumes reaching apex of florets; firmer than fertile lemma. Lower glume ovate; indurate; without keels. Lower glume apex acute (7/9), or acuminate (2/9). Upper glume ovate; cartilaginous; without keels. Upper glume apex acute (9/9). FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline. Fertile florets female. Fertile lemma oblong; hyaline; without keel. Palea hyaline. FLOWER Anthers 3 (1/1). MALE Male spikelets distinct from female; lanceolate (2/2), or elliptic (2/2). Male spikelet glumes 2; muticous. DISTRIBUTION Africa (1), or Tropical Asia (2), or Australasia (1), or Pacific (1), or North America (12), or South America (13).

  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.