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Aristida adscensionis

(Six-Weeks Three-Awn Grass)

Overview

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Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in English:

Six-Weeks Three-Awn Grass, Annual Bristle Grass, Six-Weeks Three-Awn, Sixweeks Threeawn

Common Names in Spanish:

Flechilla, Plumilla

Description

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Genus Aristida

Perennials , less often annuals or suffruticose . Culms tufted . Leaf blades usually basal, rolled or rarely flat. Inflorescence a narrow or open panicle. Spikelets with 1 floret; glumes scarious , narrow, unequal with the upper usually longer , 1(-3) -veined; floret callus bearded , obtuse to pungent or 2-toothed; lemma narrowly cylindrical or laterally compressed , convolute, glabrous or sparsely hairy ; awn 3-branched, branches arising directly from lemma apex or seated on a straight or twisted column, persistent or disarticulating either at base or apex of column (always persistent in China), scabrid . Stamens 3.

About 300 species: widely distributed in tropical and warm-temperate regions of the world; ten species (six endemic) in China.

This genus is found on poor, dry soils in areas of low rainfall, but does not usually penetrate into true desert.[1]

Physical Description

Species Aristida adscensionis

Annual . Culms tufted , erect or geniculate at base , 15-55 cm tall, branched. Leaf sheaths smooth , glabrous , shorter than internodes, laxly overlapping; leaf blades involute , 3-20 cm, finely pointed ; ligule ca. 0.5 mm. Panicle usually narrow, loosely contracted , 4-20 cm; branches short, ascending , inserted singly on main axis. Spikelets gray-green or purplish green; glumes subequal or unequal with upper longer , 1-veined, scabrid on vein , lower glume lanceolate-oblong, 4-6.8 mm, acute, upper glume linear, 5-8 mm, obtuse to emarginate or apiculate ; callus ca. 0.5 mm, narrowly obtuse; lemma linear , distinctly longer than upper glume, 7-11 mm, laterally compressed , smooth or rarely scabrid in upper half, keel scabrid upward; awn branches arising directly from lemma apex, central branch 1-2.5 cm, laterals slightly shorter. Anthers 1.8-2 mm. Fl. and fr. Jun-Oct. [source]

Aristida adscensionis is a widely distributed, variable, annual pioneer of dry, open places, recognized by its long, parallel-sided, flattened lemma often exserted from the glumes. It is used for forage . [source]

Habit: Graminoid

Habitat

Dry mountain slopes , rocky fissures , and along river banks; 200-1800 m [2].

Typically found at an altitude of 0 to 4,653 meters (0 to 15,266 feet).[3]

Biology

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Reproduction

Duration: Annual

Taxonomy

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Synonyms

A. vulgaris Trinius & Ruprecht • A. vulpioides Hance • Aristida adscensionis var. abortiva Beetle • Aristida adscensionis var. modesta Hack. • Aristida adscensionis var. vulpioides (Hance) Hackel Ex Henrard • Aristida fasciculata Torr. • Chaetaria adscensionis (Linnaeus) P. Beauvois.

Notes

Name Status: Accepted Name .

Last scrutiny: 17-Oct-2001

Similar Species

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Members of the genus Aristida

ZipcodeZoo has pages for 65 species, subspecies, varieties, forms, and cultivars in this genus:

A. adscensionis (Six-Weeks Three-Awn Grass) · A. adscensionis var. adscensionis (Sixweeks Threeawn) · A. arizonica (Arizona Three-Awn Grass) · A. basiramea (Forked Three-Awn) · A. beyrichiana (Beyrich Threeawn) · A. californica (California Three-Awn Grass) · A. californica var. californica (California Threeawn) · A. californica var. glabrata (Santa Rita Threeawn) · A. chaseae (Chase's Threeawn) · A. cognata (Spreading Threeawn) · A. condensata (Big Three-Awned Grass) · A. desmantha (Curly Threeawn) · A. dichotoma (Churchmouse Threeawn) · A. dichotoma var. curtissii (Curtis' Threeawn) · A. dichotoma var. dichotoma (Churchmouse Threeawn) · A. divaricata (Poverty Threeawn) · A. floridana (Key West Threeawn) · A. gypsophila (Gypsum Threeawn) · A. gyrans (Corkscrew Three-Awn Grass) · A. havardii (Harvard Threeawn) · A. lanosa (Woolly Three-Awn) · A. longespica (Slim-Spike Three-Awn Grass) · A. longespica geniculata (Spiked Needlegrass) · A. longespica longespica (Kearney´s Three-Awn) · A. longespica var. geniculata (Slimspike Threeawn) · A. longispica (Slimspike Threeawn) · A. longispica var. geniculata (Slimspike Threeawn) · A. longispica var. longispica (Slimspike Threeawn) · A. mohrii (Mohr's Three-Awn Grass) · A. oligantha (Oldfield Threeawn) · A. orcuttiana var. orcuttiana (Single Threeawn) · A. palustris (Longleaf Three-Awn) · A. pansa (Wooton Threeawn) · A. pansa var. pansa (Wooton's Threeawn) · A. patula (Tall Three-Awn Grass) · A. portoricensis (Pelos Del Diablo) · A. purpurascens (Arrowfeather Threeawn) · A. purpurascens var. purpurascens (Arrowfeather Threeawn) · A. purpurascens var. tenuispica (Arrowfeather Threeawn) · A. purpurascens var. virgata (Arrowfeather Threeawn) · A. purpurea (Democrat Grass) · A. purpurea var. fendleriana (Fendlers Threeawn) · A. purpurea var. longiseta (Fendlers Threeawn) · A. purpurea var. micrantha (Red Three-Awn) · A. purpurea var. nealleyi (Blue Threeawn) · A. purpurea var. parishii (Parish Threeawn) · A. purpurea var. perplexa (Purple Threeawn) · A. purpurea var. purpurea (Purple Threeawn) · A. purpurea var. wrightii (Wrights Threeawn) · A. ramosissima (Branched Three-Awn Grass) · A. ramosissima var. ramosissima (S-Curve Threeawn) · A. refracta (Islandthicket Threeawn) · A. rhizomophora (Florida Three-Awn Grass) · A. schiedeana (Single Threeawn) · A. schiedeana var. orcuttiana (Orcutt's Threeawn) · A. simpliciflora (Southern Three-Awned Grass) · A. spiciformis (Bottlebrush Threeawn) · A. stricta (Pineland Three-Awn Grass) · A. stricta var. beyrichiana (Wiregrass) · A. suringarii (St. Eustatius Threeawn) · A. swartziana (Swartz's Threeawn) · A. ternipes (Spider Three-Awn Grass) · A. ternipes var. gentilis (Mesa Threeawn) · A. ternipes var. ternipes (Spidergrass) · A. tuberculosa (Seabeach Needlegrass)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal November 15, 2007:

Identifiers

Footnotes

  1. Sheng-lian Lu, Shou-liang Chen & Sylvia M. Phillips "Aristida". in Flora of China Vol. 22 Page 453. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. "Aristida adscensionis". in Flora of China Vol. 22 Page 453, 454. Missouri Botanical Garden Press. Online at EFloras.org. [back]
  3. Mean = 1,309.230 meters (4,295.374 feet), Standard Deviation = 1,291.760 based on 553 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/15/2012