Tripogon Roem. & Schult.
  • Syst. Veg. 2: 34 (1817) 


General Description

HABIT Annual (3), or perennial (42). Rhizomes absent (42), or short (2). Culms erect (38/39), or geniculately ascending (2/39); slender (3/3); 3-30.9-90 cm long; firm (42), or wiry (2); without nodal roots (1/1), or rooting from lower nodes (1/1). Lateral branches lacking (8/8). Ligule an eciliate membrane (8), or a ciliolate membrane (20), or a ciliate membrane (6), or a fringe of hairs (10), or absent (1). Leaf-blades persistent (43), or deciduous at the ligule (1); aciculate (1), or filiform (26), or linear (18), or lanceolate (1); herbaceous (43), or coriaceous (1); stiff (7), or firm (37). Leaf-blade midrib indistinct (2/3), or conspicuous (1/3). Leaf-blade apex muticous (43), or pungent (1). INFLORESCENCE Inflorescence composed of racemes; exserted, or embraced at base by subtending leaf (1). Racemes single; erect (9), or ascending (33), or drooping (3); linear, or oblong (1); unilateral; bearing 7-9 fertile spikelets on each (1/5), or 10-14 fertile spikelets on each (2/5), or 15-24 fertile spikelets on each (3/5), or 25 fertile spikelets on each (4/5), or 26-35 fertile spikelets on each (3/5), or 36-48 fertile spikelets on each (2/5), or 49-60 fertile spikelets on each (1/5). Rhachis flattened (16/36), or angular (19/36), or subcylindrical and excavated (1/36). Spikelet packing broadside to rhachis; crowded (4), or contiguous (33), or lax (5), or distant (3); 2 -rowed (38/38). Spikelets sunken (1/31), or appressed (27/31), or ascending (3/31); solitary. Fertile spikelets sessile (43), or pedicelled (2). Pedicels reduced to a stump (3/3). FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets (2/2); 2-9-50 fertile florets; with a barren rhachilla extension (2), or with diminished florets at the apex (42). Spikelets linear (4), or lanceolate (3), or elliptic (6), or oblong (34), or cuneate (1); laterally compressed; 2.5-10.94-65 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous (41), or pilose (1), or villous (2). Floret callus pubescent (16/37), or pilose (12/37), or bearded (9/37). GLUMES Glumes persistent; shorter than spikelet; thinner than fertile lemma (2), or similar to fertile lemma in texture (40), or firmer than fertile lemma (2); parallel to lemmas (43), or recurved at apex (1), or gaping (1). Lower glume linear (7), or lanceolate (36), or oblong (5), or ovate (3); 0.25-0.6498-1 length of upper glume; membranous (43), or coriaceous (1); 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface smooth (43), or asperulous (1). Lower glume apex entire (31), or with a unilateral tooth (9), or dentate (4); 2 -fid (4/4); emarginate (1/40), or truncate (1/40), or obtuse (6/40), or acute (18/40), or acuminate (23/40), or attenuate (1/40), or setaceously attenuate (1/40); muticous (39), or mucronate (5), or awned (3). Upper glume linear (2), or lanceolate (32), or elliptic (5), or oblong (12); 0.75-1.2-2 length of adjacent fertile lemma; membranous (41), or coriaceous (3); with undifferentiated margins (41), or membranous margins (1), or scarious margins (2); 1-keeled; 1 -veined (38/42), or 2 -veined (2/42), or 3 -veined (6/42). Upper glume apex entire (38), or dentate (7); 2 -fid (7/7); emarginate (7/38), or truncate (2/38), or obtuse (5/38), or acute (15/38), or acuminate (17/38), or setaceously attenuate (1/38), or caudate (1/38); muticous (28), or mucronate (13), or awned (7); 1 -awned (7/7). FLORETS Basal sterile florets barren (2/2); without significant palea (2/2). Lemma of lower sterile floret elliptic (1/2), or ovate (1/2); membranous (2/2); 1 -veined (2/2); acute (2/2); mucronate (1/2), or awned (1/2). Fertile lemma linear (1), or lanceolate (13), or elliptic (13), or oblong (19), or ovate (9); membranous (38), or chartaceous (1), or cartilaginous (1), or coriaceous (4); of similar consistency on margins (43), or much thinner on margins (1); without keel (42), or keeled (2); 3 -veined. Lemma midvein without distinctive roughness, or scaberulous (1). Lemma lateral veins prominent (2/2); excurrent (11/22), or extending close to apex (12/22). Lemma surface smooth (42), or asperulous (1), or scaberulous (1). Lemma apex entire (5), or dentate (33), or lobed (8); 2 -fid (34/41), or 3 -fid (3/41), or 4 -fid (4/41), or 6 -fid (2/41); incised 0.33 of lemma length; emarginate (3/15), or truncate (3/15), or obtuse (8/15), or acute (3/15), or acuminate (3/15); mucronate (6), or awned (41); 1 -awned (25/41), or 3 -awned (17/41). Principal lemma awn apical (5), or from a sinus (40); straight (39), or curved (1), or flexuous (5), or geniculate (1). Lateral lemma awns subequal to principal (3/8), or shorter than principal (5/8). Palea embraced by lemma (43), or reflexed at apex (1), or separating from lemma above (1); 0.33-0.9272-1 length of lemma; 2 -veined (43/43). Palea keels wingless (22), or winged (22); smooth (38), or scaberulous (5), or scabrous (2); eciliate (16), or ciliolate (26), or ciliate (2). Palea surface glabrous (42), or pilose (2). Palea apex dentate (3/3); muticous (43), or with excurrent keel veins (1). Apical sterile florets resembling fertile though underdeveloped (42/42). FLOWER Lodicules 2 (8/8); irregularly toothed (1/1); truncate (1/1). Anthers 1 (2/39), or 2 (6/39), or 3 (31/39). Stigmas 2 (1/1). FRUIT Caryopsis with adherent pericarp (43/43); linear (1/13), or lanceolate (4/13), or ellipsoid (4/13), or oblong (5/13), or ovoid (2/13), or obovoid (1/13); isodiametric (7/7); biconvex (2/8), or plano-convex (1/8), or trigonous (5/8). Embryo 0.25-0.3883-0.5 length of caryopsis. Hilum punctiform (1/2), or elliptic (1/2). DISTRIBUTION Africa (9), or Temperate Asia (18), or Tropical Asia (25), or Australasia (1), or North America (1), or South America (3).

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.