Invasive Alien Species

Species Name: Acanthospermum hispidum

Family Name:
Asteraceae
Synonym:
Origin:
South America
Description:
Erect, annual herb, regularly branched, 30-60 cm tall. Stem coarsely, patently white-hairy. Leaves opposite, simple, sessile, entire, obovate-oblong, 7.5 x 2.5 cm. Inflorescence in few-flowered heads, about 7 mm across, sessile in the axils of the higher leaves; ray flowers female, 7-8, with strap-shaped corolla, limb with 3 short broad teeths, yellow; calyx large with short hooked spines and two large sharp, straight or apically bent, hornlike spines; disk flowers bisexual with cylindrical, slightly papillose calyx; corolla tube cylindrical, limb 5 large; stamen 5; style long, cylindrical, thick. Achenes one seeded with numerous hooked spines, two longer, apical straight spines, giving the combined fruits a star-like appearance
Invaded Habitat:
Grasslands, road sides, fallow fields, rice fields
Distribution:
East Java, Nusa Tenggara and Papua
Ecology:
Occurs in an areas with a pronounced dry season, up to 1 300 m altitude
References:
  1. Backer , C. A. & R. C. Bakhuizen Van Den Brink.  1965.  Flora of Java. N.V. P. Noordhoff. Groningen, Netherlands.
  2. Soerjani, M., A,j.G.H. Kostermans,  G. Tjirosoepomo & 1987.  Weeds of Rice in Indonesia. Balai Pustaka. Jakarta.