Code
AMADU
Growth form
Broadleaf
Biological cycle
Annual
Habitat
terrestrial
synonym | Amaranthus dubius subsp. crassespicatus Suess. |
synonym | Amaranthus dubius var. flexuosus Thell. |
synonym | Amaranthus dubius var. leptostachys Thell. |
synonym | Amaranthus dubius var. xanthostachys Thell. |
synonym | Amaranthus flexuosus hort. |
synonym | Amaranthus flexuosus hort. ex Moq. |
synonym | Amaranthus hybridus subsp. acicularis Suess. |
synonym | Amaranthus incomptus Willd. |
synonym | Amaranthus tortuosus Hornem. |
synonym | Amaranthus tricolor var. tristis (Willd.) Mehrotra, Aswal & B.S.Bisht |
synonym | Amaranthus tristis var. flexuosus Moq. |
synonym | Amaranthus tristis var. leptostachys Moq. |
synonym | Amaranthus tristis var. xanthostachys Moq. |
synonym | Amaranthus tristis Willd. |
Comorian |
|
Creoles and pidgins, French-based |
|
Creoles and pidgins; French-based |
|
Créole Réunion |
|
Créole Seychelles |
|
English |
|
Malgache |
|
Spanish; Castilian |
|
Global description
Amaranthus dubius is an annual, erect plant, up to 90 cm tall (rarely 1.50 m). It has a deep taproot. The stem is slightly stout, little or unbranched, very often pinkish red in color. It is glabrous. The leaves are arranged alternately along the stem. They are oval and held by long petioles. The obovate lamina has a notched apex that ends with a short tip. Flowers are small, green. They are grouped in small dense balls spread along slender spikes at the base of the leaves and the top of the stems. The fruit is a small capsule that opens at maturity by a small cap at the end. It contains a single shiny seed, dark brown to black in color.Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
French Guiana: Amaranthus dubius has a rapid development, the seeds can be mature only 6 weeks after emergence.
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Amaranthus dubius is an annual species. It reproduces only by seeds, which are dispersed by water and wind. It produces a large number of seeds that have a long viability.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Keys of Amaranthus
Prostate growth habit | A. blitum | |||
Erect growth Habit | a pair of spines on the axils of the leaves | A. spinosus | ||
No spines | Leaves is about 10 to 20 cm | A. hybridus | ||
Leaves about 10 cm | Flower of 3 tepals | A. viridis | ||
Flower of 5 tepals | A. dubius |
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Comoros: Amaranthus dubius grows in ploughed and abandoned land and in the courtyards of houses. It is a plant of low altitude in all region of the island of Grande Comore.
French Guiana : A nitrophilous species common in vegetable crops.
Madagascar: Ruderal species, fairly common in most climatic regions of Madagascar. It grows on soil more or less enriched in organic matter in the surroundings of villages.
Mauritius: weed of crops with a wide distribution.
Nicaragua: Amaranthus dubius is an occasional species, in open areas, especially in anthropised environments, from 400 to 920 m altitude.
Reunion: Species locally well adapted to all ecological situations of Reunion. It is less common on the east coast of the island. Species very nitrophilous, it is abundant on rich soils and in crops with high intake of nitrogen fertilizer, such as vegetable gardening.
Seychelles: Species observed on a wide variety of soil types and textures and at all elevations.
West Indies: Amaranthus dubius is a ruderal species and a crop weed that grows on rich soils, it is sometimes cultivated.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Origin
Amaranthus dubius is native to Central and Northern South America.
Worldwide distribution
This species has been introduced into tropical Africa, the Indian Ocean islands (Comoros, Madagascar, Mauritius, Reunion, Seychelles), Indonesia and New Guinea.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Local harmfulness
Comoros: Amaranthus dubius is a common weed of vegetable crops.
French Guiana: Weed which can be abundant on uncultivated in vegetable crop ridges. Especially during intercroping.
Madagascar: important weed of sheltered cultures including corn.
Mauritius: a major plant pest weed in the vegetable crops. They also compete aggressively with young canes plants when present in large numbers.
Reunion: A. dubius is a weed which has an average ecological amplitude, it is present in 40% of cultivated plots, but not a major agronomic constraints. The average recovery is 7 to 15%. This is a weed rare in sugar cane, it mainly colonizes vegetable crops, in some cases up to recovery cover of over 70%. Rather it is a ruderal species.
Seychelles: A common weed of cultivated fields, gardens and other disturbed and open habitats.
West Indies: Amaranthus dubius is a weed present in all crops. It is a very minor pest in sugarcane but can be abundant in young banana plantations, making it difficult to carry out crop care interventions. It is a common weed in vegetable and food crops where tillage and chemical and organic inputs favour its development.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Local control
West Indies: Amaranthus dubius is easily controlled by various weeding techniques when they are well managed.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Herbarium pictures ReCOLNAT: https://explore.recolnat.org/search/botanique/simplequery=Amaranthus%2520dubius
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Root | Root |
Kingdom | Plantae |
Phylum | Tracheophyta |
Class | Magnoliopsida |
Order | Caryophyllales |
Family | Amaranthaceae |
Genus | Amaranthus |
Species | Amaranthus dubius Mart. |