Overview

Comprehensive Description

Description

Annual or perennial herbs with entire, opposite leaves. Inflorescences of axillary heads or short spikes, bracteate. Flowers bisexual, solitary in the axil of each bract, subtended by 2 bracteoles. Tepals 5, glabrous and 1-nerved or barbed-pilose and 3-nerved, free, equal or unequal. Stamens 2-5, alternating with pseudostaminodes. Fruit an indehiscent capsule.
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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

Alternanthera Forssk.:
Brazil (South America)
Honduras (Mesoamerica)
United States (North America)
Colombia (South America)

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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Ecology

Habitat

Depth range based on 22 specimens in 5 taxa.

Environmental ranges
  Depth range (m): 0.5 - 1

Graphical representation

Depth range (m): 0.5 - 1
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:62Public Records:27
Specimens with Sequences:48Public Species:9
Specimens with Barcodes:47Public BINs:0
Species:16         
Species With Barcodes:13         
          
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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 Alternanthera

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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Wikipedia

Alternanthera

Alternanthera is a genus of flowering plants in the amaranth family, Amaranthaceae. It is a widespread genus with most species occurring in the tropical Americas,[1][2] and others in Asia, Africa, and Australia.[2] Plants of the genus may be known generally as joyweeds.[3] Several species are notorious noxious weeds.[4]

Description[edit]

These are annual or perennial herbs or subshrubs. While some of the better-known species are aquatic plants, most are terrestrial.[4] They take many forms, from prostrate to erect to floating. The leaves are oppositely arranged. The inflorescence is a spike or a rounded head occurring in the leaf axils or the ends of branches. The flowers have 5 tepals. There are 3 to 5 stamens which are fused into a rim at the bases, and 5 pseudostaminodes, appendages between the stamens that are not true staminodes. The fruit is a utricle containing one seed.[2]

Biology[edit]

The photosynthetic pathways vary in this genus. Some Alternanthera species undergo C3 carbon fixation, and others have the C4 pathway. Certain other species have an intermediate C3-C4 pathway.[1][5]

Ecology[edit]

Many species have been reported as noxious weeds, including A. angustifolia, A. caracasana, A. denticulata, A. nana, A. nodiflora, A. paronychioides, A. philoxeroides, A. sessilis, A. tenella, and A. triandra.[4] The most important species is alligator weed (A. philoxeroides), a South American aquatic plant that has spread to other continents.[4] It is a weed of many kinds of agricultural crops, it is an invasive species that degrades native habitat, and its dense mats of vegetation clog waterways, slowing shipping and increasing flooding.[4] Alternanthera plants are known to produce allelopathic compounds that injure other plants, including crops.[4]

Biological pest control agents now in use to reduce alligator weed infestations include the alligator weed flea beetle (Agasicles hygrophila), the alligator weed thrips (Amynothrips andersoni), and the alligator weed stem borer (Arcola malloi).[4]

Uses[edit]

A. philoxeroides and A. sessilis are eaten as vegetables in parts of Asia.[4]

Some Alternanthera are used as ornamental plants.[4]

Diversity[edit]

Alternanthera Party time
Alternanthera polygonoides

It is not yet clear how many species belong in the genus. Estimates range between 80 and 200.[1][2][4][6]

Species include:[3][6][7]

See also[edit]

List of freshwater aquarium plant species

References[edit]

  1. ^ a b c Sánchez-Del Pino, I., et al. (2012). Molecular phylogenetics of Alternanthera (Gomphrenoideae, Amaranthaceae): resolving a complex taxonomic history caused by different interpretations of morphological characters in a lineage with C4 and C3–C4 intermediate species. Botanical Journal of the Linnean Society 169(3), 493-517.
  2. ^ a b c d Alternanthera. Flora of North America.
  3. ^ a b Alternanthera. Integrated Taxonomic Information System (ITIS).
  4. ^ a b c d e f g h i j Tanveer, A., et al. (2013). A review on genus Alternanthera weeds implications. Pak. J. Weed Sci. Res 19(1), 53-58.
  5. ^ Chinthapalli, B., et al. (2001). Phosphoenolpyruvate carboxylase purified from leaves of C3, C4, and C3-C4 intermediate species of Alternanthera: Properties at limiting and saturating bicarbonate. Photosynthetica 38(3), 415-19.
  6. ^ a b Alternanthera. The Plant List.
  7. ^ GRIN Species Records of Alternanthera. Germplasm Resources Information Network (GRIN).
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