Aegopogon Humb. & Bonpl. ex Willd.
  • Sp. Pl. 4: 899 (1806) 


Notes: Distribution: SW. U.S.A. to S. Trop. America

General Description

HABIT Annual (4), or perennial (1). Culms erect (1), or geniculately ascending (1), or decumbent (3), or prostrate (1); slender (1/1); 4-18.7-40 cm long; without nodal roots (1/2), or rooting from lower nodes (2/2). Lateral branches sparse (1/1). Ligule an eciliate membrane (4), or a ciliolate membrane (1). Leaf-blades filiform (1), or linear (4); firm (2), or flaccid (3). INFLORESCENCE Inflorescence composed of racemes. Racemes borne along a central axis; spreading; cuneate; unilateral; bearing a triad of spikelets (4), or few fertile spikelets (1); bearing 2 fertile spikelets on each (1/1). Rhachis obsolete; deciduous from axis. Raceme-bases brief (2), or cuneate (3). Spikelets in pairs (1), or in threes (4). Fertile spikelets sessile (2), or pedicelled (3); 1 in the cluster (4), or 2 in the cluster (1). Companion sterile spikelets pedicelled (4/4); 2 in the cluster (4/4). Pedicels linear (2), or oblong (3). STERILE SPIKELETS Companion sterile spikelets absent (1), or well-developed (4); deciduous with the fertile (4/4). Companion sterile spikelet glumes muticous (1/4), or mucronate (1/4), or awned (3/4). FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 1.5-3.33-7.5 mm long; falling entire; deciduous with accessory branch structures. GLUMES Glumes shorter than spikelet. Lower glume linear (1), or lanceolate (1), or obovate (1), or cuneate (3); 0.8-0.92-1 length of upper glume; membranous, or chartaceous (1); without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface smooth (4), or scabrous (1); glabrous (3), or pubescent (2). Lower glume apex entire (2), or lobed (3); 2 -fid (3/3); obtuse (2), or acute (1), or acuminate (2); muticous (2), or awned (4). Upper glume linear (1), or lanceolate (1), or obovate (1), or cuneate (3); 0.33-0.636-0.8 length of adjacent fertile lemma; membranous, or chartaceous (1); without keels; 1 -veined. Upper glume surface smooth (4), or scabrous (1); glabrous (3), or pubescent (2). Upper glume apex entire (2), or lobed (3); 2 -fid (3/3); obtuse (2), or acute (1), or acuminate (2); muticous (2), or awned (4); 1 -awned (4/4). FLORETS Fertile lemma elliptic (2), or ovate (3); laterally compressed; lanceolate in profile (4/4); membranous, or chartaceous (1); keeled; 3 -veined. Lemma lateral veins without ribs (2), or ribbed (3). Lemma surface smooth (4), or scabrous (1); glabrous (3), or puberulous (1), or pubescent (1). Lemma apex lobed; 2 -fid (1), or 3 -fid (4); incised 0.1-0.2333-0.3 of lemma length; acute (1), or acuminate; awned; 1 -awned (1), or 3 -awned. Principal lemma awn apical (4), or from a sinus (1). Lateral lemma awns shorter than principal. Palea 1 length of lemma; 2 -veined. Palea keels separated (1), or contiguous above a sulcus (4). Palea surface glabrous (2), or puberulous (1), or pubescent (2). Palea apex dentate (4/4); with excurrent keel veins (1), or awned (4). FLOWER Lodicules 2 (4/4); membranous (1/4), or fleshy (3/4). Anthers 3. Stigmas 2 (3/3). Ovary glabrous (1/1). FRUIT Caryopsis with adherent pericarp (4/4); fusiform (2/2); isodiametric (2/2); biconvex (2/2); smooth (1/1); apex unappendaged (1/1). Embryo 0.3 length of caryopsis. Hilum punctiform (1/1). DISTRIBUTION Tropical Asia (2), or North America (4), or South America (3).

Distribution Map

 
  • Native distribution
  • Introduced distribution
Found in
  • Northern America Mexico Mexican Pacific Is.
  • Mexico Central
  • Mexico Northeast
  • Mexico Southeast
  • Mexico Southwest
  • Southwestern U.S.A. Arizona
  • California
  • Southern America Brazil Brazil Southeast
  • Central America Costa Rica
  • El Salvador
  • Guatemala
  • Honduras
  • Panamá
  • Northern South America Guyana
  • Venezuela
  • Southern South America Argentina Northwest
  • Western South America Bolivia
  • Colombia
  • Ecuador
  • Peru
Introduced into
  • Asia-Tropical Papuasia New Guinea

  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.