Overview

Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Ala., Ark., Fla., Ga., La., Miss., N.C., Tenn., Tex., Va.; e Mexico; West Indies; n South America.
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Physical Description

Morphology

Description

Stems erect, branched, stout to robust, usually 1.5-3 m (occasionally to 9 m!) × 30 cm. Leaves: petiole 1/3-2/3 length of blade; blade narrowly lanceolate to narrowly ovate, 10-20 × 1-4 cm, base cuneate, margins entire, plane, apex acute or long-attenuate to acuminate. Inflorescences mostly terminal, linear spikes to panicles, usually interrupted. Bracts: of pistillate flowers 1.5-2 mm; of staminate flowers with moderately heavy midribs, 1.5-2 mm. Pistillate flowers: tepals absent; style branches spreading; stigmas 3-5. Staminate flowers: tepals 5, inner tepals with moderately prominent, excurrent midribs, equal, 2-2.5 mm, apex subacute to mucronulate; stamens 5. Utricles stramineous to brown, with 3(-5) longitudinal ridges corresponding to 3-5 style branches, elliptic or obovoid, 1.5-2.5 mm, slightly fleshy, smooth (slightly rugose in herbarium specimens). Seeds reddish brown to dark brown, 1-1.2 mm diam., shiny.
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Diagnostic Description

Synonym

Acnida australis A. Gray, Amer. Naturalist 10: 489. 1876; A. alabamensis Standley; A. cannabina Linnaeus var. australis (A. Gray) Uline & W. L. Bray; A. cuspidata Bertero ex Sprengel
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Type Information

Holotype for Acnida alabamensis Standl.
Catalog Number: US 721866
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): C. T. Mohr
Year Collected: 1896
Locality: Swampy borders of tidewater shores, One Mile Creek 4-01., Mobile, Alabama, United States, North America
  • Holotype: Standley, P. C. 1917. N. Amer. Fl. 21: 121.
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Isotype for Acnida alabamensis Standl.
Catalog Number: US 721867
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): C. T. Mohr
Year Collected: 1896
Locality: Swampy banks. One Mile Creek., Mobile, Alabama, United States, North America
  • Isotype: Standley, P. C. 1917. N. Amer. Fl. 21: 121.
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Ecology

Habitat

Freshwater and brackish wetland habitats, coastal marshes, swamps, riverbanks, bayous, canals, ditches, estuaries, lakeshores, hammocks; 0-100m.
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Depth range based on 8 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 1 - 1
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering summer-fall.
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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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Wikipedia

Amaranthus australis

Amaranthus australis is also known as southern amaranth or southern water-hemp. The plant usually grows from 1 to 3 m (3 to 9 feet) in height, though some have been known to grow up to 9 m (27 feet) high. The stems can be up to 30 cm in diameter. It is a herbaceous annual. It is found in many Southern states of the USA, Mexico, the West Indies, and South America. They are frequently found in wetland areas. It is herbaceous, short lived perennial.The largest is 15.12 ft. tall.


References[edit]

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Notes

Comments

Plants of Amaranthus australis, a herbaceous annual, can be amazingly tall, with a single hollow main stem, up to 9 m, and the stem base can reach 30 cm in diameter. Large plants may somewhat resemble young trees of Taxodium distichum var. imbricarium, pondcypress.
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