Overview

Distribution

National Distribution

Canada

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Xinjiang (Tian Shan) [Kazakhstan, Kyrgyzstan, Pakistan, Russia, Tajikistan, Turkmenistan, Uzbekistan; SW Asia, C and S Europe; introduced in Australia and the United States].
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Distribution: Pakistan (N.W.F.P. & Kashmir); Mediterranean region, southern USSR and the Middle East.
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Physical Description

Morphology

Physical Description

Annuals, Terrestrial, not aquatic, Stems trailing, spreading or prostrate, Stems geniculate, decumbent, or lax, sometimes rooting at nodes, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stems compressed, flattened, or sulcate, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly closed, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous , Leaf sheath or blade keeled, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades very narrow or filiform, less than 2 mm wide, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, Leaf blades scabrous, roughened, or wrinkled, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal, Inflorescence racemose, Inflorescence simple spikes, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence a panicle with narrowly racemose or spicate branches, Inflorescence single raceme, fascicle or spike, Inflorescence branches 1-sided, Rachis angular, Flowers bisexual, Spikelets sessile or subsessile, Spikelets laterally compressed, Inflorescence or spikelets partially hidden in leaf sheaths, subtended by spatheole, Spikelet less than 3 mm wide, Spikelets with 3-7 florets, Spikelets solitary at rachis nodes, Spikelets distichously arranged, Spikelets all alike and fertil le, Spikelets bisexual, Spikelets disarticulating above the glumes, glumes persistent, Spikelets disarticulating below the glumes, Spikelets disarticulating beneath or between the florets, Spikelets falling with parts of disarticulating rachis or pedicel, Spikelets secund, in rows on one side of rachis, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes distinctly unequal, Glumes shorter than adjacent lemma, Glumes keeled or winged, Glumes 3 nerved, Glumes 4-7 nerved, Lemma coriaceous, firmer or thicker in texture than the glumes, Lemma 5-7 nerved, Lemma glabrous, Lemma apex truncate, rounded, or obtuse, Lemma awnless, Lemma margins thin, lying flat, Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea shorter than lemma, Palea 2 nerved or 2 keeled, Palea keels winged, scabrous, or ciliate, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis.
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Dr. David Bogler

Source: USDA NRCS PLANTS Database

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Description

Tufted annual; culms up to 16 cm high, procumbent to erect. Leaf-blades 1.5-7 cm long, 2-4 mm wide, glabrous, scaberulous on the margins. Inflorescence 1-4 cm long, rigid, ± secund; pedicels stout, up to 1 mm long. Spikelets 6-10 mm long, narrowly oblong, crowded, glumes somewhat asymmetrical, glabrous, oblong-ovate, with broad hyaline margins, the lower 2-3 mm long, obtuse to emarginate, (1-)3(-5)-nerved; the upper 3.5-5 mm long, rounded to emarginate, (5-)7-9-nerved; lowest lemma 4.8-6 mm long, the upper much shorter, glabrous, rounded to emarginate, sometimes very shortly mucronate.
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Description

Annual forming small dense tuft. Culms ascending or decumbent, 5–15 cm tall. Leaf sheaths smooth, glabrous, lower papery, whitish; leaf blades flat, 1.5–7 cm × 2–4 mm, glabrous, adaxial surface scabrid; ligule 1–3 mm, acute. Panicle elliptic-oblong in outline, dense, stiff, 1–5 cm, scarcely exserted from uppermost leaf sheath; branches bearing a single spikelet or shortly racemose near middle. Spikelets narrowly oblong, 6–10 mm, florets 3–5, lower 2–3 fertile, upper male or sterile; glumes ovate-oblong, lower glume 2–3 mm, upper glume 3.5–5 mm; lemmas ovate-oblong, lowest 4.8–6 mm, the upper much shorter, all veins prominent, apex obtuse to emarginate. Anthers 0.8–1.3 mm. Caryopsis 2.5–3.5 mm, brown. 2n = 14.
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Diagnostic Description

Synonym

Cynosurus durus Linnaeus, Sp. Pl. 1: 72. 1753.
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Type Information

Holotype for Crassipes annuus Swallen
Catalog Number: US 1469998
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): C. Fallas
Year Collected: 1928
Locality: Between Salt Lake City at Ogden, at foot of Wasatch Mts., Utah, United States, North America
  • Holotype: Swallen, J. R. 1931. Amer. J. Bot. 18: 685.
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Source: National Museum of Natural History Collections

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Ecology

Habitat

Hill slopes; 500–1000 m.
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Life History and Behavior

Cyclicity

Flower/Fruit

Fl. & Fr. Per.: April-May.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Sclerochloa dura

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Sclerochloa dura

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 2
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNA - Not Applicable

United States

Rounded National Status Rank: NNA - Not Applicable

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

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Wikipedia

Sclerochloa dura

Sclerochloa dura is a species of grass known by the common names common hardgrass and fairground grass. It is native to Eurasia, and it is known in parts of North America and Australia as an introduced species and a common weed of disturbed, high-traffic areas such as parking lots, roadsides, and playing fields. It is a sturdy annual grass forming low, flat clumps of short stems, some prostrate and some upright. The flat, overlapping leaf blades are a few centimeters long. The inflorescence is a crowded, one-sided series of flattened spikelets.

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Notes

Comments

1000-1700 m.
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