Diarrhena P.Beauv.
  • Ess. Agrostogr.: 142 (1812) 


Notes: , nom. cons. Distribution: Russian Far East to China and Japan, SE. Canada to C. & E. U.S.A.

General Description

HABIT Perennial. Rhizomes short (3), or elongated (2). Culms erect, or geniculately ascending (1); slender (1/1); 48-80.9-131 cm long. Lateral branches lacking (1/1). Ligule an eciliate membrane (4), or a ciliolate membrane (1). Leaf-blades linear (3), or lanceolate (4). Leaf-blade venation without cross veins (1), or with obscure cross veins (1), or with distinct cross veins (3). INFLORESCENCE Inflorescence a panicle. Panicle open (3), or contracted (2). Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform (1/1). FERTILE SPIKELETS Spikelets comprising 1 fertile florets (2), or 2-3 fertile florets (4), or 4-5 fertile florets (2), or 6-7 fertile florets (1); without rhachilla extension (3), or with diminished florets at the apex (2). Spikelets oblong (2), or ovate (1), or obovate (3); laterally compressed; 3-8.2-18 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous (4), or pubescent (1). Floret callus glabrous (1/1). GLUMES Glumes persistent; shorter than spikelet. Lower glume lanceolate; 0.33-0.575-0.75 length of upper glume; membranous (3), or cartilaginous (2); 1-keeled; 1 -veined, or 2-3 -veined (1). Lower glume lateral veins absent, or distinct (1). Lower glume apex acute. Upper glume lanceolate (4), or ovate (2); 0.3-0.542-0.7 length of adjacent fertile lemma; membranous (3), or cartilaginous (2); 1-keeled; 1 -veined (3), or 2 -veined (1), or 3 -veined (3), or 4-5 -veined (2). Upper glume apex acute. FLORETS Fertile lemma lanceolate (2), or elliptic (2), or ovate (4); chartaceous (1), or herbaceous (1), or cartilaginous (3); of similar consistency on margins (3), or much thinner on margins (2); without keel; 3 -veined, or 4-5 -veined (1). Lemma lateral veins with distinct primaries but obscure intermediates (1/2), or prominent (1/2). Lemma surface smooth (4), or scabrous (1). Lemma apex obtuse (2), or acute (1), or cuspidate (2); muticous (4), or awned (1); 1 -awned (1/1). Principal lemma awn pungent (1/1). Palea 2 -veined. Palea keels smooth (4), or scabrous (1); eciliate (4), or ciliolate (1). Palea apex dentate (1/1). Apical sterile florets resembling fertile though underdeveloped (2/2). FLOWER Lodicules 2; membranous. Anthers 2 (1/4), or 3 (4/4). FRUIT Caryopsis with tardily free pericarp; ellipsoid, or obovoid (4); apex umbonate. DISTRIBUTION Temperate Asia (3), or North America (2).

Distribution Map

 
  • Native distribution
  • Introduced distribution
Found in
  • Asia-Temperate China China North-Central
  • China Southeast
  • Manchuria
  • Eastern Asia Japan
  • Korea
  • Russian Far East Amur
  • Khabarovsk
  • Kuril Is.
  • Primorye
  • Northern America Eastern Canada Ontario
  • North-Central U.S.A. Illinois
  • Iowa
  • Kansas
  • Minnesota
  • Missouri
  • Nebraska
  • Oklahoma
  • South Dakota
  • Wisconsin
  • Northeastern U.S.A. Indiana
  • Michigan
  • New York
  • Ohio
  • Pennsylvania
  • West Virginia
  • South-Central U.S.A. Texas
  • Southeastern U.S.A. Alabama
  • Arkansas
  • Georgia
  • Kentucky
  • North Carolina
  • Tennessee
  • Virginia
Introduced into
  • Northern America Southeastern U.S.A. District of Columbia
  • Maryland

 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.