At first I thought they were the more beautiful and bigger version of Tridax procumbens, a weed which we can find everywhere by the roadsides in Malaysia.
“Spanish Needles Bidens pilosa for Wildflower Wednesday”, a copyrighted post, was written for My Nice Garden blog by Autumn Belle @ http://www.mynicegarden.com/ on June 23rd, 2011.
Origin: Tropical America
This is an annual plant that can grow to 1m tall. It is considered a weed in some tropical countries in Africa, Asia and Tropical America) while in other countries it is used as a food and medicinal source. In sub-Saharan Africa, the tender shoots and young leaves are used fresh or dried as a leaf vegetable to be stored for use in times of scarcity.
The plant is used in traditional chinese medicine under the name of xian feng cao (咸豐草).
The seeds are black and contain 4-5 black burrs which cling to humans and animals.
Information from: Wikipedia.
This is my entry for Wildflower Wednesday hosted by Clay and Limestone every fourth Wednesday of the month, the link here.