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Overview

Comprehensive Description

Description

Grass Family (Poaceae). Green sprangletop is a native, warm season, short lived, perennial bunch grass. The height ranges from 1 to 3 feet. The leaf blade is 6 to 18 inches long, usually flat, and sometimes folded. The leaf sheaths are sometimes longer than the internodes, flattened, and often purplish. The ligule is hairy. The seedhead is a spreading, open, nodding panicle 4 to 12 inches long, consisting of 5 to 20 slender, well separated branches 2 to 5 inches long. Each spikelet is 5  to 8 flowered.

Distribution: For current distribution, please consult the Plant Profile page for this species on the PLANTS Web site.

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USDA NRCS National Plant Data Center

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Alternative names

zacate gigante, green spangletop.

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Source: USDA NRCS PLANTS Database

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Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Global Range: USA: FL, OK, TX, NM, AZ; Mexico; Argentina.

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Physical Description

Morphology

Physical Description

Perennials, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, 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, Stems branching above base or distally at nodes, Stem internodes hollow, Stems with inflores cence less than 1 m tall, Stems with inflorescence 1-2 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath hairy at summit, throat, or collar, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Leaf blades more or less hairy, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence a panicle with narrowly racemose or spicate branches, Inflorescence a panicle with digitately arranged spicate branches, Inflorescence with 2-10 branches, Inflorescence branches more than 10 to numerous, Inflorescence branches 1-sided, Inflorescence branches pa ired or digitate at a single node, Flowers bisexual, Spikelets sessile or subsessile, Spikelets laterally compressed, Spikelet less than 3 mm wide, Spikelets solitary at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating above the glumes, glumes persistent, Spikelets disarticulating beneath or between the florets, 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 1 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma 3 nerved, Lemma body or surface hairy, Lemma apex dentate, 2-fid, Lemma awnless, Lemma mucronate, very shortly beaked or awned, less than 1-2 mm, Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea about equal to lemma, Palea 2 nerved or 2 keeled, 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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Type Information

Type fragment for Diplachne dubia var. kurtziana Kuntze
Catalog Number: US 865874
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): E. Kurtz
Locality: Caminiaba., Córdoba, Argentina, South America
  • Type fragment: Kuntze, O. 1898. Rev. Generum Pl. 3: 349.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Type fragment for Schismus patens J. Presl
Catalog Number: US 78816A
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): T. P. X. Haenke
Locality: Cordilleris Chilensis., Chile, South America
  • Type fragment: Presl, J. S. 1830. Reliq. Haenk. 1: 269.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

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Syntype for Chloris dubia Kunth in H.B.K.
Catalog Number: US 865876
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): F. W. Humboldt & A. J. A. Bonpland
Locality: Mexico, North America
  • Syntype: Humboldt, F. W., et al. 1816. Nova Genera Sp. Pl. 1: 169.
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Type fragment for Disakisperma mexicana Steud.
Catalog Number: US 865873
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): E. G. von Steudel
Year Collected: 1845
Locality: Mt. Parreyss., Mexico, Central America
  • Type fragment: Steudel, E. G. von. 1854. Syn. Pl. Glumac. 1: 287.
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Isotype for Leptochloa pringlei Beal
Catalog Number: US 78806
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. G. Pringle
Year Collected: 1884
Locality: Sierra Tucson., Pima, Arizona, United States, North America
  • Isotype: Beal, W. J. 1896. Grasses N. Amer. 436.
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Syntype for Chloris dubia Kunth in H.B.K.
Catalog Number: US 865875
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): A. J. A. Bonpland
Locality: E of Monserrat, Mexico, Central America
  • Syntype: Humboldt, F. W., et al. 1816. Nova Genera Sp. Pl. 1: 169.
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Isotype for Diplachne dubia var. pringleana Kuntze
Catalog Number: US 899043
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): C. G. Pringle
Year Collected: 1885
Locality: Hills & plains near Chihuahua., Chihuahua, Mexico, North America
  • Isotype: Kuntze, O. 1898. Rev. Generum Pl. 3: 349.
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Ecology

Habitat

Comments: Rocky hills and canyons and sandy soil.

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Dispersal

Establishment

Growth starts about April. If moisture is scarce, it may become semi-dormant in the summer and make new growth after the fall rains. It becomes dormant in the late fall. It may produce two seed crops, one in the spring and one in the fall. It is best adapted to deep sandy soils in Florida and to rocky hills and canyons in the rest of its range. It is seldom found on deep clay or deep sandy soils in the western part of its range.

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USDA NRCS National Plant Data Center

Source: USDA NRCS PLANTS Database

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Leptochloa dubia

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


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Statistics of barcoding coverage: Leptochloa dubia

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

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Status

Please consult the PLANTS Web site and your State Department of Natural Resources for this plant’s current status, such as, state noxious status and wetland indicator values.

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USDA NRCS National Plant Data Center

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Management

Cultivars, improved and selected materials (and area of origin)

Please contact your local NRCS Field Office.

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During the dormant season, it furnishes good quality forage, but should be supplemented with a protein concentrate. It is used in range seeding mixtures. When this grass is a key management species, no more than 50 percent of current growth by weight should be removed at any season. Summer and fall grazing deferments of at least 90 days improve vigor, increase seed production, and provide forage for winter use. The seedhead turns pale and droops at maturity.

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Relevance to Humans and Ecosystems

Benefits

Uses

Green sprangletop is grazed readily by all livestock, especially when green and succulent.

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Wikipedia

Leptochloa dubia

Leptochloa dubia is a species of grass known by the common names green sprangletop and zacate gigante. It is native to the Americas, where it is distributed from the United States to Argentina.[1]

This perennial grass grows up to 110 centimeters tall. The leaves are up to 35 centimeters long and are hairless to hairy or rough in texture.[2] The leaf sheaths are sometimes purplish.[3] The inflorescence is a branching panicle with brown or greenish spikelets.[2]

This grass is a good forage for animals and it is sometimes added to seed mixes used for vegetating rangeland.[3]

References

  1. ^ Leptochloa dubia. Germplasm Resources Information Network.
  2. ^ a b Leptochloa dubia. Grass Manual Treatment.
  3. ^ a b Leptochloa dubia. USDA NRCS Plant Fact Sheet.
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