Vernacular
  • Galsiektebos,
  • Insukumbili,
  • Kruiehondebosie,
  • Mexican tea,
  • Sandworm plant,
  • Vlooibossie,
  • Wormseed goosefoot
Details
Eppo_code

CHEAM

Family

Amaranthaceae

Species

Dysphania ambrosioides (L.) Mosyakin & Clemants

Meaning_of_the_name

ambrosioides - leaves like those of the genus Ambrosia.

Global_description

D. ambrosioides is an herbaceous plant, erect, branched up to 1.20 m in height, pyramidal. It is dotted with fine or short and almost glabrous leaves which have a large polymorphism. It has a strong penetrating odor. The stem is erect, branched from the base, especially when the plant is isolated. The stem grows only after a rosette of leaves.

Similar_species
Cotyledons

Cotyledons are elliptic, green on the upper surface and reddish on the lower surface. They are dotted with white glandular dots. It has a strong and unpleasant smell.

First_leaves

First leaves are two opposite leaves, the following leaves alternate. Leaves are arranged in a rosette form, from 10 to 20.

Habit

Herbaceous plant with a strong odor. It can grow up from 40 to 100 cm high. It is green sometimes tinged with purple.

Underground_system

Branched roots.

Stem

The stem is cylindrical, solid, finely pubescent, hairs white vesicular. It is crossed by streaks of green and may have a purple pigmentation.

Leaves

Leaves are simple, alternate and short petiolate. The leaves are oval to elliptical, acute at the apex, attenuated acute at the base. It is 2.5 to 14 cm long and 1.5 to 3.5 cm wide. The margin is usually winding gear in, but can also be irregularly toothed. The veins are prominent on the underside. The upper surface is smooth, bright green while the underside is lighter dotted with small sessile yellow glands, transparent, filled with a liquid whose smell is unpleasant.

Inflorescence

Large Inflorescence, highly branched. They are grouped by 4 or 5 to form small clusters sessile, 0.5 to 1.5 mm in diameter. They gather in the ear along the terminal branches.

Flowers

Flowers are greenish, 0.5 to 1.5 mm in diameter, in spikes The female flowers have 3-5 tepals, while the bisexual flowers possess 4-5. They are pubescent to glabrous, glandular, smooth or rarely keeled. Flowering from August to July.

Fruits

Fruits are indehiscent utricle, lenticular. It has smooth pericarp surrounded by the tepals. It contain seeds.The fruits matures one month after flowering.

Seeds

Seeds are lens-shaped, dark red-brown to blackish, 0.5 to 1.25 mm in diameter. It is shiny, almost smooth with a coat, marked by sinuous lines.

Biology

D. ambrosioides is an annual weed, rarely perennial short life. It reproduces by seeds.

Ecology

It occurs in roadsides, dump site, crop fields. It is common in warm countries. This species has an important morphological polymorphism. It grows well on light soils, sandy soils in areas receiving good rainfall.

Origine

Native to South America.

World_distribution
South_african_distribution

Dstributed to the entire parts of South Africa.

Knp_distribution

Distributed to the entire part of KNP.

Use

It is traditionally used to treat different ailments from cough, stomach ache, eczema and sandworm.

Global_weediness

It is not a troublesome weed, low ecological impact. Very common weed in Mauritius and Namibia.

South_african_weediness

Widespread weed in South Africa.

Knp_weediness

It is an ivasive weed with moderate ecological impact.

Global_control
Control_knp

It can be controlled by cultivation at seedling stage. Pre- and post- emergence herbicide is applicable as a control method for this weed.

References

-(AdventOI) Le Bourgeois, T., Carrara, A., Dodet, M., Dogley, W., Gaungoo, A., Grard, P., Ibrahim, Y., Jeuffrault, E., Lebreton, G., Poilecot, P., Prosperi, J., Randriamampianina, J.A., Andrianaivo A.P., and Théveny, F. (2008). Advent-OI: Principales adventices des îles du sud-ouest de l'Océan Indien. Cirad. Montpellier, France, Cirad.
-(Problem plants of South Africa) Bromilow, C. (2001), Published by Briza Publications CC.
-(A revised list of alien plants for the Kruger National Park.Koedoe) Foxcroft, L.C., Henderson, L., Nichols, G.R., Martin, B.W.

Web_links

http://idao.cirad.fr/SpecieSheet?sheet=adventoi/especes/c/cheaa/cheaa_fr.html

Vernacular Country Language Source
Wormseed goosefoot English Problem plant and alien weeds of South Africa.
Mexican tea English Problem plant and alien weeds of South Africa.
Sandworm plant English Problem plant and alien weeds of South Africa.
Galsiektebos Afrikaans Problem plants and alien weeds of South Africa
Kruiehondebosie South Africa Afrikaans Problem plants and alien weeds of South Africa
Vlooibossie South Africa Afrikaans Problem plants and alien weeds of South Africa
Insukumbili South Africa Xhosa Problem plants and alien weeds of South Africa
Map