Galinsoga parviflora (PROTA)

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Plant Resources of Tropical Africa
Introduction
List of species


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flowering plant habit
flowering plant
close up of flower

Galinsoga parviflora Cav.


Protologue: Icon. 3(2): 41 (1796).
Family: Asteraceae (Compositae)
Chromosome number: 2n = 16

Vernacular names

  • Gallant soldier, chickweed, smallflower galinsoga, quickweed (En).
  • Galinsoga à petites fleurs, piquant blanc (Fr).
  • Erva da moda, picão branco (Po).
  • Msekeseke (Sw).

Origin and geographic distribution

Galinsoga parviflora originates from Central America. It has been introduced elsewhere and it can be found in both temperate and tropical regions. In tropical Africa it is widespread and has been collected in Cape Verde, central, eastern and southern Africa, and the Indian Ocean islands.

Uses

People in Uganda, Tanzania, Malawi, Zambia, Zimbabwe and possibly elsewhere in Africa collect gallant soldier when weeding their crops. The young stems and leaves are cooked and eaten as a vegetable but flowerheads and buds are usually removed. Gallant soldier is also eaten as a vegetable in South-East Asia. In South America the dried leaves (’guascas’) are an essential flavouring for certain dishes.

Gallant soldier is used for the treatment of nettle stings and similar skin inflammation by rubbing the affected skin with the leaves. The leaves are used for wound dressing in Ethiopia. The plant is grazed by livestock and used as a feed for chicken, rabbits and pigs.

Properties

The leaves of gallant soldier contain per 100 g edible portion: water 88.4 g, energy 653 kJ (156 kcal), protein 3.2 g, fat 0.4 g, carbohydrate 5.2 g, fibre 1.1 g, Ca 284 mg, Mg 60 mg, P 58 mg, Fe 5.3 mg, Zn 1.3 mg, carotene 4 mg, thiamin 0.08 mg, riboflavin 0.21 mg, niacin 1.21 mg, ascorbic acid 6.7 mg (Wehmeijer, A.S. & Rose, E.F., 1983).

Tests of the plant for antibacterial and insecticidal activities have given negative results, but it had strong cardiovascular effects.

Description

  • Annual plant with erect to ascending stems, 20–60(–120) cm tall, glabrous or sparsely pubescent.
  • Leaves opposite, simple; petiole 2–15 mm long; blade ovate or ovate-oblong, 1–6.5 cm × 0.5–4.5 cm, margin shallowly serrate.
  • Inflorescence a terminal or axillary head, often in pairs; involucral bracts in 2 rows, glabrous, pales present, trifid.
  • Ray flowers female, usually 5, white, with short ligule and marked tube; disk flowers tubular, yellow.
  • Fruit an achene 1–2 mm long, central achenes ovate, black, with pappus consisting of white, fimbriate scales as long as the fruit, marginal achenes without pappus.

Other botanical information

Galinsoga comprises 14 species and is indigenous in tropical America. Galinsoga parviflora and the tetraploid Galinsoga quadriradiata Ruiz & Pav. (synonyms: Galinsoga ciliata (Raf.) S.F.Blake, Galinsoga urticifolia (Raf.) S.F.Blake) have become common weeds in Africa. The latter species is more hairy.

As a weed, gallant soldier is difficult to eradicate because plants left on the ground after weeding may re-establish roots, whereas undeveloped seeds will continue to ripen even under dry conditions. Fields can soon be covered by gallant soldier because a single plant of 8–9 weeks old can produce over 7000 viable seeds and several generations are possible in each growing season. The small, lightweight fruits can be spread by the wind and the stiff pappus hairs cling to people’s clothing or the fur of animals.

Ecology

In tropical Africa gallant soldier is found from sea-level to 2400 m altitude. It requires medium to high rainfall conditions. Seed requires temperatures of 10–35ºC and light to germinate. Buried seeds do not germinate at all, and shade also prevents germination, which is why gallant soldier is only found on open land or as a weed between young and small crop plants. It grows well in a variety of soils but prefers soil with ample nutrients and good drainage.

Management

Farmers consider Galinsoga parviflora an indicator of high soil fertility. In Africa it is only collected from the wild and trade is limited to local markets.

Gallant soldier is a common and locally serious weed reported in wheat and maize in Ethiopia, cotton in Uganda, coffee, maize, sorghum and beans in Tanzania, wheat in Angola, vegetables in Zambia, maize in Zimbabwe and potatoes in Mozambique. It serves as an alternate host for many insects and viruses which affect crop species such as tobacco, potato and cabbage. It is also a host plant for Phytophthora infestans and root-knot nematodes.

Genetic resources

Being a widespread weed, Galinsoga parviflora is not liable to genetic erosion.

Prospects

Interest in Galinsoga parviflora is mainly directed at its control as a notorious weed. Locally, however, it will continue to make a contribution to the diet of many.

Major references

  • Andersen, R.N., 1968. Germination and establishment of weeds for experimental purposes. Weed Science Society of America handbook. University of Illinois, Urbana, United States. 236 pp.
  • Burkill, H.M., 1985. The useful plants of West Tropical Africa. 2nd Edition. Volume 1, Families A–D. Royal Botanic Gardens, Kew, Richmond, United Kingdom. 960 pp.
  • Canne, J.M., 1977. A revision of the genus Galinsoga (Compositae: Heliantheae). Rhodora 79: 319–389.
  • Katende, A.B., Ssegawa, P. & Birnie, A., 1999. Wild food plants and mushrooms of Uganda. Technical Handbook No 19. Regional Land Management Unit/SIDA, Nairobi, Kenya. 490 pp.
  • Wehmeyer, A.S. & Rose, E.F., 1983. Important indigenous plants used in the Transkei as food supplements. Bothalia 14(3–4): 613–615.

Other references

  • Holm, L.G., Plucknett, D.L., Pancho, J.V. & Herberger, J.P., 1977. The world’s worst weeds. Distribution and biology. University Press of Hawaii, Honolulu, United States. 609 pp.
  • Kokwaro, J.O., 1993. Medicinal plants of East Africa. 2nd Edition. Kenya Literature Bureau, Nairobi, Kenya. 401 pp.
  • Tredgold, M.H., 1986. Food plants of Zimbabwe. Mambo Press, Gweru, Zimbabwe. 153 pp.
  • van den Bergh, M.H., 1993. Minor vegetables. In: Siemonsma, J.S. & Kasem Piluek (Editors). Plant Resources of South-East Asia No 8. Vegetables. Pudoc Scientific Publishers, Wageningen, Netherlands. pp. 280–310.

Author(s)

  • R.R. Schippers, De Boeier 7, 3742 GD Baarn, Netherlands

Correct citation of this article

Schippers, R.R., 2004. Galinsoga parviflora Cav. [Internet] Record from PROTA4U. Grubben, G.J.H. & Denton, O.A. (Editors). PROTA (Plant Resources of Tropical Africa / Ressources végétales de l’Afrique tropicale), Wageningen, Netherlands.

Accessed 12 November 2020.