Alternanthera

Alternanthera Party time

Alternanthera sessilis W2 IMG 3422

Alternanthera polygonoides2

Dentatagarden

Alternanthera is a genus of flowering plants in the Amaranthaceae family, which is known for its diverse species often characterized by their colorful foliage and small, inconspicuous flowers. The genus includes both annual and perennial plants, widely distributed in tropical and subtropical regions around the world. Alternanthera species are commonly used in horticulture for their attractive leaves and are also found in various ecosystems, playing roles in local biodiversity.

Description

Alternanthera species vary greatly in size, form, and color of their leaves. They can be erect or prostrate, often forming dense mats. The leaves can be simple or slightly lobed, with colors ranging from green to purple, red, and variegated patterns. Flowers are typically small, white or off-white, grouped in inflorescences. Despite their modest flowers, many Alternanthera species are highly valued for their foliage.

Taxonomy

The genus Alternanthera was first described by Carl Linnaeus in 1753. It belongs to the Amaranthaceae family, which is part of the Caryophyllales order. The taxonomy of Alternanthera has been complex due to the morphological diversity within the genus, leading to numerous synonyms and reclassifications over time.

Ecology

Alternanthera species are adaptable to a wide range of habitats, from aquatic environments to dry lands. They can be found in natural settings as well as disturbed areas, indicating their resilience to environmental changes. Some species are considered invasive species in regions outside their native range, where they can outcompete local flora and disrupt ecosystems.

Uses

1. 1. 1. Horticulture ###

Many Alternanthera species are popular in gardens and landscapes for their colorful foliage. They are used in borders, ground covers, and container plantings. Alternanthera dentata, known as Joseph's Coat, is among the most popular species for its vibrant leaves.

1. 1. 1. Traditional Medicine ###

In some cultures, Alternanthera species are used in traditional medicine for treating various ailments, although scientific evidence supporting these uses is limited.

1. 1. 1. Aquaria ###

Alternanthera species such as Alternanthera reineckii are also favored in the aquarium trade for their striking colors and ability to thrive underwater, adding diversity and visual appeal to planted tanks.

Conservation

While many Alternanthera species are common and not considered at risk, habitat destruction and climate change pose threats to some species, especially those with limited distributions. Conservation efforts are necessary to ensure the survival of less common and vulnerable species within the genus.

Selected Species

• Alternanthera dentata – Joseph's Coat
• Alternanthera philoxeroides – Alligator weed
• Alternanthera reineckii – Used in aquaria

See Also

• Amaranthaceae
• Invasive species
• Horticulture