Overview

Comprehensive Description

Description

Annuals (in ours). Leaves: lamina pectinate. Ligule a line of hairs. Inflorescence dense, cylindric, spike-like. Spikelets bisexual, 1-flowered, in clusters of 2-5 (2 in ours), lanceolate to ovate, awnless. Glumes dissimilar; lower a tiny hyaline scale or 0; upper as long as the spikelet, its nerves prominent and each bearing a row of stout hooked prickles. Lemma ± as long as the upper glume, ovate, membranous. Stamens 3.
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© Mark Hyde, Bart Wursten and Petra Ballings

Source: Flora of Zimbabwe

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Distribution

Localities documented in Tropicos sources

Nazia Adans.:
Caribbean (Caribbean)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO 63110 USA

Source: Missouri Botanical Garden

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Localities documented in Tropicos sources

Tragus Haller:
Argentina (South America)
Bolivia (South America)
Brazil (South America)
Ecuador (South America)
Honduras (Mesoamerica)
Mexico (Mesoamerica)
Peru (South America)
United States (North America)
Venezuela (South America)
Caribbean (Caribbean)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO 63110 USA

Source: Missouri Botanical Garden

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:17Public Records:5
Specimens with Sequences:14Public Species:3
Specimens with Barcodes:14Public BINs:0
Species:6         
Species With Barcodes:5         
          
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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 Tragus

Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Barcode data

Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Wikipedia

Tragus (plant)

Tragus, commonly called burr grass or carrot-seed grass, is a genus in the grass family, Poaceae. Plants are monoecious, stoloniferous, and either annual or perennial depending on the species. The genus is primarily native to Africa[clarification needed], but has been introduced in subtropical and tropical areas around the world as weeds of disturbed areas. The culms (stems) are ascending or low and mat forming, glabrous, and circular in cross-section. Blades are flat or folded and linear, ligules membraneous and trichomatous. Flowers are born in narrow panicles; the primary branches are spirally arranged, each possessing 2-5 spikelets; each of these spikelets bears a single floret. Each floret has 3 stamens, the anthers of which are pale yellow. The caryopses (grains) are elliptical and golden-brown.[1]

Four species of Tragus have been introduced to North America: T. australianus, T. berteronianus, T. heptaneuron, and T. racemosus. The natural chromosome count is 2n = 20 in T. berteronianus, and 2n = 40 in T. racemosus.[2] Tragus species utilize C4 photosynthesis. They prevent erosion, but make for poor grazing and in larger numbers indicate overgrazing.[3]

List of species[edit]

References[edit]

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Source: Wikipedia

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