Amaranthus dubius is a ANNUAL growing to 1 m (3ft 3in). It is frost tender. It is in leaf from April to October, in flower from July to September, and the seeds ripen. The name Amaranthus dubius was first published by Martius () without diagnosis and description, so it has to be considered invalid. Amaranthus dubius is a weedy plant widespread throughout the humid lowland tropics. It originates from tropical America, where it is common in the Caribbean.

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Called the ‘C4 carbon-fixation pathway’, this process is particularly efficient at high temperatures, in bright sunlight and under dry conditions[].

Amaranthus dubius early flowering due to dry Amaranthus dubius Amaranthus dubius Thell. Tropics areas of South America and West Indies.

Amaranthus dubius in Flora of North America @

It is also found in intercropping systems with food crops. Economic Impact Top of page There are no known economic impacts of A. Investigations about the history of introduction, substratum characteristics, pollination, seed production, dispersal, germination and pollen morphology.

Cultivated types of A. Generate a print friendly version containing only the sections you need. Notes on Taxonomy and Nomenclature Top of page The name Amaranthus dubius was first published by Martius without diagnosis and description, so it has to be considered invalid McNeill et al.


Some information cannot be used for commercial reasons or be modified but some can. Weedy Amaranthus dubius is a host plant for the bacterium Xanthomonas campestris affecting tomato and for the nematode Rotylenchulus reniformis affecting banana.

Cytogenetic studies in Amaranthus. This is especially noticeable on land where chemical fertilizers are used. Seeds are dispersed by wind, water, birds and as a contaminant in pasture and crop seeds and attached in agricultural machinery.

Flowering stem Photograph by: It is frost tender. Flowers unisexual, subsessile, with 4— 5 tepals up to 2.

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Amarxnthus characteristics and germination properties. Adams, ; Smithsonian Institution, On hybridization between Amaranthus dubius and A. It is cultivated in many countries, especially in Africa, but it can be difficult amaarnthus know whether its presence in a country is only as a cultivated plant or as a naturalised plant.

However, especially in tropical Africa it is widely naturalized and cultivated and could compete with other cultivated plants, causing a reduction in agricultural income see for example Costea et al.


The main habitats in which A. Please view the copyright link for more information. The main use of Amaranthus dubius is as a cooked leaf vegetable. There are citation in web searches related to Amaranthus dubius Mart.

Commercial growers now spray insecticides instead of using the traditional control method of spreading wood ash to dispel insects. International Common Names English: The product is dark green and tender but its taste somewhat neutral. Pal M, Khoshoo TM, The first seeds mature about 6 weeks after sowing.

A geographical atlas of world weeds.

Rather small, but very nutritious, it can be ground and used as a powder. It differs from these species by having bracts shorter than tepals long less than 2 mm and strongly spreading style branches.

Editorial de la Universidad de Puerto Rico. It is almost impossible to make a distinction between Amaranthus dubius and Amaranthus spinosus based on morphological characters; Amaranths spinosus has axillary spines which are not present in Amaranthus dubius.