Author Shizhao
鬼针草（Bidens pilosa）

Scientific classification:
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Asterales
Family: Asteraceae
Genus: Bidens
Species: B. pilosa
Binomial name : Bidens pilosa

Bidens pilosa is a species in the plant family Asteraceae. It is considered a weed in some tropical habitats. However, in some parts of the world it is a source of food. They sprout individual flowers which are small, yellow and usually contain 4 to 5 white petals. The seeds are black and contain 4-5 black burs which cling to livestock and humans.

The plant is known under many different names:

Afrikaans: knapsekêrel (from Kaapse kerwel, literally "Cape Chervil")Also, Black Jack.
Bontoc: nguad, puriket
English: broom stick, broom stuff, cobbler's pegs, devil's needles. Known in Australia as farmers friends, pitchforks, etc
Fijian: batimadramadra, matakaro, matua kamate, mbatikalawau
Filipino: pisau-pisau
French: bident hérissé, herbe d'aiguille, herbe villebague, piquants noirs
Hawaiʻian: kī, kī nehe, kī pipili, nehe
Ibatan: dadayem
Japanese: ko-sendangusa
Maori (Cook Islands): kamika tuarongo, nīroa, piripiri, piripiri kerekere, piripiri nīroa
Niuean: kofetoga (=Tongan bamboo, i.e.: junk bamboo)
Futunan: tae puaka (=pig shit)
Pukapukan: pilipili
Spanish: acetillo, amor seco, arponcito, asta de cabra, bidente piloso, cacho de cabra, cadillo, hierba amarilla, masquia, mazote, papunga chipaca, pega-pega, perca, rosilla, sirvulaca
Tahitian: piripiri (=sticker)
Tongan: fisi‘uli (=black flower)
Source: wikipedia.org