World Library  
Flag as Inappropriate
Email this Article

Aristida

Article Id: WHEBN0003575319
Reproduction Date:

Title: Aristida  
Author: World Heritage Encyclopedia
Language: English
Subject: Aristida, Graminoids of Soldiers Delight, Spear grass, Wiregrass, Needlegrass
Collection: Aristida, Poaceae Genera
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Aristida

wiregrass
speargrass
needlegrass
kerosene grass
purple three-awn (Aristida purpurea)
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Poales
Family: Poaceae
Subfamily: Aristidoideae
Tribe: Aristideae
Genus: Aristida
L.
Type species
Aristida adscensionis
L.[1][2]
Synonyms[3]
purple three-awn (Aristida purpurea) flowers
pineland three-awn (A. stricta) flowers

Aristida is a very nearly cosmopolitan genus of plants in the grass family.[4][5]

Aristida is distinguished by having three awns (bristles) on each lemma of each floret.[6] The genus includes about 300 species found worldwide, often in arid warm regions. This genus is among those colloquially called three-awns wiregrasses, speargrasses and needlegrasses.[7][8][9]

Aristida stems are ascending to erect, with both basal and cauline leaves. The leaves may be flat or inrolled, and the basal leaves may be tufted. The inflorescences may be either panicle-like or raceme-like, with spiky branches. The glumes of a spikelet are narrow lanceolate, usually without any awns, while the lemmas are hard, three-veined, and have the three awns near the tip. The awns may be quite long; in A. purpurea var. longiseta they may be up to 10 cm.

They are characteristic of semiarid grassland. The Wiregrass Region of North America is named for A. stricta. Other locales where this genus is an important component of the ecosystem include the Carolina Bays, the sandhills of the Carolinas, and elsewhere, Mulga scrub in Australia, and the xeric grasslands around Lake Turkana in Africa.

Local increases in the abundance of wiregrasses is a good indicator of overgrazing, as livestock avoid them.

Contents

  • Selected species 1
  • See also 2
  • References 3
  • Further reading 4

Selected species

See also

References

  1. ^ lectotype designated by Henrard, Meded. Rijks.-Herb. 54: 9 (1926)
  2. ^ L.AristidaTropicos,
  3. ^ Kew World Checklist of Selected Plant Families
  4. ^ Linnaeus, Carl von. 1753. Species Plantarum 1: 82 in Latin
  5. ^ LAristidaTropicos,
  6. ^ Watson, L. and M. J. Dallwitz. (2008). "The grass genera of the world: descriptions, illustrations, identification, and information retrieval; including synonyms, morphology, anatomy, physiology, phytochemistry, cytology, classification, pathogens, world and local distribution, and references". The Grass Genera of the World. Retrieved 2009-08-19. 
  7. ^ Linnaeus, Sp. Pl. 1: 82. 1753.Aristida san mang cao shu 三芒草属Flora of China Vol. 22 Page 453
  8. ^ AristidaAltervista Flora Italiana, genere includes photos, drawings, and range maps for several species
  9. ^ L.AristidaAtlas of Living Australia, kerosene grasses,

Further reading

  • Hickman, James C. (ed.) (1993): The Jepson Manual - Higher Plants of California: 1234-1235.


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.