Microstegium Nees
  • J.Lindley, Intr. Nat. Syst. Bot., ed. 2: 447 (1836) 


Notes: Distribution: Uganda to S. Africa, Trop. & Subtrop. Asia to Pacific

General Description

HABIT Annual (16), or perennial (10). Rhizomes absent (25), or elongated (1). Culms erect (2/24), or geniculately ascending (2/24), or decumbent (5/24), or prostrate (4/24), or rambling (12/24), or scandent (1/24); robust (3/8), or slender (4/8), or weak (1/8); 10-70.27-400 cm long; rooting from lower nodes (18/18). Culm-internodes terete (1/1). Lateral branches lacking (1/9), or sparse (1/9), or ample (7/9). Ligule an eciliate membrane (22), or a ciliolate membrane (3), or a fringe of hairs (1). Leaf-blade base without a false petiole (21), or with a brief petiole-like connection to sheath (2), or with a false petiole (3). Leaf-blades linear (7), or lanceolate (21), or elliptic (7), or oblong (2), or ovate (3); stiff (1), or firm (19), or flaccid (6). INFLORESCENCE Inflorescence composed of racemes. Racemes single (5), or paired (3), or digitate (22); erect (1), or ascending (22), or spreading (4), or drooping (2). Rhachis tough (4), or fragile at the nodes (22); wingless (25), or narrowly winged (1); flattened (5/10), or angular (3/10), or semiterete (2/10). Spikelet packing contiguous (25), or lax (1). Rhachis internodes filiform (8), or linear (13), or columnar (1), or clavate (1), or cuneate (2), or pyriform (2). Rhachis internode tip cupuliform (1/1). Spikelets appressed (9/9); in pairs. Fertile spikelets sessile (2), or sessile and pedicelled (22), or pedicelled (2); 1 in the cluster (1), or 2 in the cluster (25); subequal (1/3), or the upper smaller (2/3). Companion sterile spikelets pedicelled (2/2); 1 in the cluster (2/2). Pedicels filiform (8), or linear (13), or clavate (4), or cuneate (1); tip widened (1/1). STERILE SPIKELETS Basal sterile spikelets absent (25), or well-developed (1). Companion sterile spikelets absent (24), or rudimentary (1), or well-developed (2). FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (17), or elliptic (4), or oblong (7); laterally compressed (1), or dorsally compressed (25); 1.66-4.354-7 mm long; falling entire; deciduous from the base (25), or with accessory branch structures (22). Spikelet callus brief (24), or square (2); glabrous (3/19), or pubescent (6/19), or pilose (7/19), or bearded (5/19); base obtuse; attached transversely (25/25). GLUMES Glumes exceeding apex of florets (2/2); firmer than fertile lemma. Lower glume linear (2), or lanceolate (3), or elliptic (14), or oblong (9); chartaceous (2), or cartilaginous (2), or coriaceous (22); 2-keeled; wingless (25), or winged on keel (1); 2-3 -veined (2/17), or 4 -veined (11/17), or 5 -veined (4/17), or 6-7 -veined (5/17), or 8 -veined (3/17), or 9 -veined (1/17). Lower glume lateral veins obscure (1), or distinct (25); without ribs (25), or ribbed (1); intercarinal veins distinct (2/3), or absent below, prominent above (1/3). Lower glume surface flat (3), or concave (8), or with a longitudinal median groove (16); smooth (19), or asperulous (3), or scabrous (5); glabrous (22), or puberulous (1), or pilose (3). Lower glume apex entire (21), or dentate (7); 2 -fid (7/7); emarginate (7/19), or truncate (1/19), or obtuse (7/19), or acute (5/19), or acuminate (1/19). Upper glume lanceolate (1), or elliptic (23), or oblong (2); membranous (3/7), or chartaceous (5/7), or cartilaginous (2/7); with undifferentiated margins (25), or hyaline margins (1); without keels (3/25), or 1-keeled (24/25); 1-2 -veined (1/16), or 3 -veined (14/16), or 4 -veined (1/16), or 5 -veined (2/16), or 6 -veined (1/16), or 7 -veined (2/16). Upper glume primary vein eciliate (22), or ciliolate (1), or ciliate (3). Upper glume lateral veins with cross-veins (1/1). Upper glume surface smooth (25), or scabrous (1); glabrous (24), or pilose (2). Upper glume apex entire (23), or dentate (3); 2 -fid (3/3); acute (12/17), or acuminate (4/17), or attenuate (2/17); muticous (15), or mucronate (3), or awned (9); 1 -awned (9/9). FLORETS Basal sterile florets male (9/21), or barren (15/21); with palea (10/20), or without significant palea (10/20). Lemma of lower sterile floret linear (3/17), or lanceolate (10/17), or oblong (5/17); hyaline (18/18); 0 -veined (2/3), or 1 -veined (1/3), or 3 -veined (1/3); obtuse (2/3), or acuminate (1/3); muticous (16/17), or awned (1/17). Palea of lower sterile floret hyaline (8/10), or membranous (2/10). Fertile lemma linear (9), or lanceolate (4), or oblong (8), or ovate (1), or orbicular (5); hyaline (25), or membranous (1); without keel; 0 -veined (11/13), or 3 -veined (2/13). Lemma surface glabrous (25), or pubescent (1). Lemma margins eciliate (23), or ciliolate (1), or ciliate (2). Lemma apex entire (6), or dentate (13), or lobed (8); 2 -fid (21/21); incised 0.25-0.4575-0.75 of lemma length; emarginate (2/5), or acuminate (3/5); muticous (2), or mucronate (1), or awned (24); 1 -awned (24/24). Principal lemma awn apical (6/25), or from a sinus (20/25); straight (2/25), or flexuous (7/25), or geniculate (16/25); attenuate (23/25), or with thread-like crinkled tip (2/25). Palea present (15), or absent or minute (11); 0.33-0.8883-1 length of lemma; hyaline (9/15), or membranous (6/15); 0 -veined (1/1); without keels (2/15), or 2-keeled (13/15). Palea surface glabrous (13/15), or pilose (2/15). Palea apex dentate (2/2). FLOWER Lodicules 2 (5/5). Anthers 2 (6/22), or 3 (16/22). FRUIT Caryopsis with adherent pericarp (3/3); fusiform (1/2), or obovoid (1/2). Embryo 0.25-0.375-0.5 length of caryopsis. Hilum punctiform (1/1). DISTRIBUTION Africa (3), or Temperate Asia (15), or Tropical Asia (18), or Australasia (1), or Pacific (3), or North America (1).

Distribution Map

 
  • Native distribution
  • Introduced distribution
Found in
  • Africa East Tropical Africa Tanzania
  • Uganda
  • South Tropical Africa Malawi
  • Mozambique
  • Zimbabwe
  • Southern Africa Cape Provinces
  • KwaZulu-Natal
  • Northern Provinces
  • West-Central Tropical Africa Rwanda
  • Zaire
  • Asia-Temperate China China North-Central
  • China South-Central
  • China Southeast
  • Hainan
  • Manchuria
  • Tibet
  • Eastern Asia Japan
  • Korea
  • Nansei-shoto
  • Taiwan
  • Russian Far East Primorye
  • Asia-Tropical Indian Subcontinent Assam
  • East Himalaya
  • India
  • Nepal
  • Pakistan
  • Sri Lanka
  • West Himalaya
  • Indo-China Laos
  • Myanmar
  • Thailand
  • Vietnam
  • Malesia Borneo
  • Jawa
  • Lesser Sunda Is.
  • Malaya
  • Maluku
  • Philippines
  • Sulawesi
  • Sumatera
  • Papuasia New Guinea
  • Solomon Is.
  • Pacific Northwestern Pacific Caroline Is.
  • Marianas
  • South-Central Pacific Society Is.
  • Southwestern Pacific Fiji
  • New Caledonia
  • Samoa
  • Vanuatu
Introduced into
  • Africa West-Central Tropical Africa Cameroon
  • Congo
  • Asia-Temperate Caucasus Transcaucasus
  • Western Asia Iran
  • Turkey
  • Northern America North-Central U.S.A. Illinois
  • Missouri
  • Northeastern U.S.A. Connecticut
  • Indiana
  • Masachusettes
  • New Jersey
  • New York
  • Ohio
  • Pennsylvania
  • West Virginia
  • South-Central U.S.A. Texas
  • Southeastern U.S.A. Alabama
  • Arkansas
  • Delaware
  • District of Columbia
  • Florida
  • Georgia
  • Kentucky
  • Louisiana
  • Maryland
  • Mississippi
  • North Carolina
  • South Carolina
  • Tennessee
  • Virginia
  • Southern America Caribbean Puerto Rico

  Bibliography

  • 1 Chen, C.H., Veldkamp, J.-F. & Kuoh, C.S. (2012). Taxonomic revision of Microstegium s.str. (Andropogoneae, Poaceae). Blumea 57: 160-189.
  • 2 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.