Invasive Alien Species

Species Name: Scoparia dulcis

Family Name:
Scrophulariaceae
Synonym:
Origin:
Tropical America
Description:
Erect herb, much-branched, 25-75 cm tall; flowers in axils of all upper leaves; pedicels 5-7 cm. Stem angularly ribbed. Leaves opposite in in whorls of 3, narrowly elliptical and tapered to the base, margins from about the middle to the tip coarsely toothed, below densely dotted, and midrib strongly prominent, 10-30 x 3-12 mm; petiole 2-8 mm. Inflorescence small, numerous, solitary or in pairs; pedicel slender 1 cm long or shorter; sepal 4, green; corolla white with 4 spreading petals; base of the petals with a mass of white hairs surrounding 4 greenish stamens and green ovary. Fruit capsule, 4-valved,  yellow brown.  Seeds many, brown.
Invaded Habitat:
Fallow fields, roads, old walls, in ever-wet regions with a prolonged dry season, upland and lebak rice fields, onion crops.
Distribution:
Introduced into Java before 1860, and become naturalized; trough-out Indonesia.
Ecology:
Growth on all kinds of soils, from 0-1600 m alt. Flowers throughout the year, can produce 800-1000 seeds per plant.
References:
  1. Backer , C. A. & R. C. Bakhuizen Van Den Brink.  1965.  Flora of Java Vol. II.  N.V. P. Noordhoff. Groningen, Netherlands 
  2. Barnes, D.E. and L.G. Chan. 1990. Common Weeds of Malayaia and Their Control. Ancom Berhad. Persiaran. Selangor. 40 000 Shah Alam, Malaysia
  3. Pancho, J.V. and S.R. Obien. 1983. Manual of Weeds of Tobacco Farms in the Philippines. Philippine Tobacco Research and Training Center, Mariano Marcos State University Batac, Ilocos Norte. 
  4. Soerjani, M.,  A. J. G. H. Kostermans & Gembong Tjitrosoepomo (Eds.).  1987.  Weeds of Rice in Indonesia. Balai Pustaka. Jakarta. 
  5. Syawal, Y. et al.  1992.  Gulma yang Dominan Pada Agroekosistem di Sumatera Selatan.  Dalam Prosiding Konferensi HIGI XI.  Ujung Pandang.