Overview

Comprehensive Description

Description

Annuals or perennials. Spikelets 1-flowered, disarticulating above the glumes, in terminal, lax or contracted, panicles; glumes persistent, narrow, usually 1-nerved. Lemma narrow, with hard callus at base, with or without a beak or twisted column; articulation present or 0, usually visible as a transverse darker line on the body of the lemma, occurring at the apex of the lemma or at the apex of the column; awns 3 (1 central, 2 lateral) or rarely 1, glabrous.
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Source: Flora of Zimbabwe

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:215Public Records:61
Specimens with Sequences:188Public Species:28
Specimens with Barcodes:187Public BINs:0
Species:70         
Species With Barcodes:63         
          
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Source: Barcode of Life Data Systems (BOLD)

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Barcode data

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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Aristida

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Wikipedia

Aristida

The grass genus Aristida is distinguished by having three awns (bristles) on each lemma of each floret.[1] 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".

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.

Selected species[edit]

See also[edit]

Notes[edit]

References[edit]

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


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