Jansenella Bor
  • Kew Bull. 10: 6 (1955) 

Notes: Distribution: Indian Subcontinent to Myanmar

General Description

HABIT Annual. Culms erect (1), or geniculately ascending (1), or decumbent (1); slender (1/1); 10-23.75-40 cm long; rooting from lower nodes. Ligule an eciliate membrane. Leaf-blades lanceolate; firm, or flaccid (1). INFLORESCENCE Inflorescence a panicle. Panicle open. Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (1), or oblong (1), or ovate (1); laterally compressed; 5-7.75-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose (1/1). GLUMES Glumes persistent; reaching apex of florets (1), or exceeding apex of florets (1); thinner than fertile lemma. Lower glume ovate; 0.5-0.575-0.6 length of upper glume; membranous; without keels; 3 -veined. Lower glume surface glabrous (1), or pilose. Lower glume apex acute; awned. Upper glume lanceolate (1), or oblong (1); 1 length of adjacent fertile lemma; membranous; without keels; 3-4 -veined (1), or 5 -veined. Upper glume surface smooth (1), or scabrous (1); glabrous (1), or pilose; with tubercle-based hairs. Upper glume apex acute; awned; 1 -awned (1/1). FLORETS Basal sterile florets male, or barren; with palea. Lemma of lower sterile floret lanceolate (1), or oblong (1); 0.9-0.95-1 length of fertile lemma; membranous; 3 -veined, or 4-5 -veined (1); obtuse (1/1); awned. Palea of lower sterile floret winged on keels. Fertile lemma oblong; chartaceous (1), or coriaceous; without keel; 3 -veined. Lemma surface glabrous (1), or pilose; with marginal hair tufts (1), or with a transverse row of hair tufts (1). Lemma margins involute; interlocking with palea keels. Lemma apex lobed; 2 -fid; incised 0.3-0.35-0.4 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate. Lateral lemma awns shorter than principal. Palea 2 -veined. Palea keels winged. Palea surface glabrous (1), or pubescent (1). Palea apex dentate. FLOWER Lodicules 2 (1/1); fleshy (1/1). Anthers 3. Stigmas 2. FRUIT Caryopsis with adherent pericarp; ellipsoid (1), or oblong (1); dorsally compressed; plano-convex. Embryo 0.5 length of caryopsis. Hilum punctiform. DISTRIBUTION Tropical Asia.

Distribution Map

  • Native distribution
Found in
  • Asia-Tropical Indian Subcontinent Assam
  • India
  • Sri Lanka
  • Indo-China Myanmar


  • 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
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. (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
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.