Dimeria R.Br.
  • Prodr. Fl. Nov. Holl.: 204 (1810) 


Notes: Distribution: Madagascar, S. Arabian Pen., Primorye to Trop. & Subtrop. Asia, N. & NE. Australia to W. Pacific

General Description

HABIT Annual (44), or perennial (13). Stolons absent (55), or present (2). Culms erect (36/41), or geniculately ascending (12/41), or decumbent (5/41); slender (19/19); 5-32.25-120 cm long; without nodal roots (2/5), or rooting from lower nodes (5/5). Lateral branches lacking (9/16), or sparse (5/16), or ample (3/16). Leaves differentiated into sheath and blade (56), or without demarcation between sheath and blade (1). Ligule an eciliate membrane (18), or a ciliolate membrane (39). Leaf-blades linear (56), or lanceolate (16); stiff (2), or firm (52), or flaccid (3). Leaf-blade midrib evident (1/4), or conspicuous (3/4). Leaf-blade margins cartilaginous (3/3). INFLORESCENCE Inflorescence composed of racemes; not deciduous as a whole (56), or deciduous as a whole (1); subtended by an unspecialized leaf-sheath (54), or an inflated leaf-sheath (3); exserted (56), or embraced at base by subtending leaf (1). Peduncle widened at apex (1/1). Racemes single (20), or paired (36), or digitate (16); side by side (42/43), or intertwined (1/43); appressed (1), or erect (5), or ascending (53); unilateral; bearing few fertile spikelets (1), or many spikelets (56); bearing 2-7 fertile spikelets on each (1/1). Rhachis persistent (42/43), or deciduous from axis (1/43); wingless (37), or narrowly winged (15), or broadly winged (5); flattened (28/48), or angular (17/48), or subterete (4/48). Spikelet packing crowded (43), or contiguous (11), or lax (3); 2 -rowed (52/52). Raceme-bases brief (56), or filiform (1); unequal (the longer measured) (1/1). Spikelets appressed (54/56), or ascending (1/56), or spreading (1/56); solitary. Fertile spikelets sessile (5), or pedicelled (52). Pedicels linear (1/50), or oblong (3/50), or clavate (2/50), or cuneate (31/50), or reduced to a stump (13/50). FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets linear (2), or lanceolate (5), or elliptic (23), or oblong (29), or ovate (4), or obovate (1), or oblanceolate (2); laterally compressed; 1-4.618-12 mm long; persistent on plant (1), or falling entire (56). Spikelet callus brief (41), or square (7), or oblong (6), or cuneate (3); glabrous (1/49), or pubescent (31/49), or pilose (9/49), or bearded (10/49); base truncate (6/50), or obtuse (44/50), or acute (2/50), or pungent (1/50); attached obliquely (1/1). GLUMES Glumes shorter than spikelet (1), or reaching apex of florets (2), or exceeding apex of florets (54); firmer than fertile lemma; parallel to lemmas (56), or recurved at apex (1). Lower glume linear (18), or lanceolate (6), or elliptic (22), or oblong (24); chartaceous (10), or coriaceous (47); without keels (2), or 1-keeled (55); wingless (40), or winged on keel (17), or winged on margins (1); 1 -veined (2/16), or 3 -veined (14/16). Lower glume lateral veins absent (2), or distinct (55). Lower glume surface smooth (46), or asperulous (6), or scabrous (5); glabrous (43), or puberulous (1), or pubescent (9), or pilose (6). Lower glume apex emarginate (1/56), or obtuse (6/56), or acute (29/56), or acuminate (17/56), or attenuate (3/56), or setaceously attenuate (3/56); muticous (55), or mucronate (3). Upper glume lanceolate (13), or elliptic (37), or oblong (21), or ovate (3); 5.5-5.75-6 length of adjacent fertile lemma; chartaceous (8), or coriaceous (54); with undifferentiated margins (25), or hyaline margins (32); without keels (5), or 1-keeled (52); wingless (16), or winged on keel (42), or winged on margins (1); 1 -veined (3/18), or 3 -veined (15/18). Upper glume primary vein eciliate (25), or ciliolate (3), or ciliate (30). Upper glume surface smooth (48), or asperulous (5), or scabrous (3), or rugose (1); glabrous (39), or puberulous (1), or pubescent (4), or pilose (12), or hirsute (1), or villous (2), or hispid (1). Upper glume apex emarginate (1), or obtuse (4), or acute (28), or acuminate (25), or attenuate (3), or setaceously attenuate (2); muticous (48), or mucronate (2), or awned (7); 1 -awned (7/7). FLORETS Basal sterile florets barren (55/55); without significant palea (55/55). Lemma of lower sterile floret linear (2/54), or lanceolate (44/54), or elliptic (2/54), or oblong (9/54), or obovate (1/54); hyaline (54/54); 0 -veined (3/19), or 1 -veined (13/19), or 2 -veined (3/19); obtuse (2/9), or acute (7/9). Fertile lemma lanceolate (2), or elliptic (44), or oblong (9), or ovate (1), or obovate (1), or oblanceolate (3); hyaline (31/34), or membranous (2/34), or cartilaginous (1/34); without keel; 1 -veined (52/52). Lemma surface smooth (56), or papillose (1). Lemma margins eciliate (55), or ciliolate (2), or ciliate (1). Lemma apex entire (1), or dentate (56); 2 -fid (56/56); muticous (1), or mucronate (1), or awned (56); 1 -awned (56/56). Principal lemma awn apical (1), or from a sinus (56); straight (3), or curved (1), or geniculate (55); limb glabrous (56), or puberulous (1). Column of lemma awn glabrous (55/56), or puberulous (1/56). Palea present (11), or absent or minute (46); hyaline (3/11), or membranous (8/11); 0 -veined (1/1). Palea keels smooth (9/11), or tuberculate (2/11); eciliate (10/11), or ciliate (1/11). Palea surface glabrous (9/11), or pilose (2/11). FLOWER Lodicules 2 (18/18); fleshy (1/1); glabrous (17/18), or ciliate (1/18); truncate (2/2). Anthers 2 (54/54). Stigmas 2 (1/1). FRUIT Caryopsis with adherent pericarp (19/19); linear (2/18), or lanceolate (1/18), or ellipsoid (4/18), or oblong (14/18); isodiametric (1/3), or laterally compressed (2/3). Embryo 0.5 length of caryopsis. Hilum punctiform (2/2). DISTRIBUTION Africa (3), or Temperate Asia (6), or Tropical Asia (49), or Australasia (3), or Pacific (3).

Distribution Map

 
  • Native distribution
Found in
  • Africa Western Indian Ocean Madagascar
  • Asia-Temperate Arabian Peninsula Oman
  • China China South-Central
  • China Southeast
  • Eastern Asia Japan
  • Korea
  • Nansei-shoto
  • Taiwan
  • Russian Far East Primorye
  • Asia-Tropical Indian Subcontinent Assam
  • Bangladesh
  • India
  • Nepal
  • Sri Lanka
  • West Himalaya
  • Indo-China Cambodia
  • Laos
  • Myanmar
  • Nicobar Is.
  • Thailand
  • Vietnam
  • Malesia Borneo
  • Jawa
  • Lesser Sunda Is.
  • Malaya
  • Philippines
  • Sulawesi
  • Sumatera
  • Papuasia New Guinea
  • Australasia Australia Northern Territory
  • Queensland
  • Western Australia
  • Pacific Northwestern Pacific Caroline Is.
  • Marianas
  • Southwestern Pacific Santa Cruz Is.

Included Species

  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.