Invasive Alien Species
Species Name: Conyza sumatrensis
- Family Name:
- Erigeron sumatrensis Retz.
E. linifolius auct. Non Willd
- Tropical America
- Strongly branched perennial herb, woody at base, 30-200 cm tall. Stem cylindrical, strongly ribbed, finely hairy. Leaves helically arranged, sessile or almost so, lanceolate to oblanceolate, 3-12 x 0.3-3 cm, coarsely toothed or sub-lobed. Inflorescence terminal, head flowers numerous, peduncled, narrowly ovoid, bract numerous in 2 whorls; ray flowers in several whorls, female; disc flowers 6-11, bisexual or male, light yellow. Achenes small, 1.5-2 mm long, brown, 4-angled, sparsely finely haired, pappus hairs numerous, toothed, 3-4 mm long.
- Invaded Habitat:
- Old coffee trees, bushes, young secondary shrubs, steep embarkments, alang-alang and other grass vegetations, along dikes and roads, upland rice fields, agricultural lands, rubber and tea plantations on less fertile soils.
- Pantropical. Found for the first time in Java in 1860, and spread throughout Indonesia.
- Sunny to lightly shaded dry or moist (but not marshy) regions with weak or pronounced dry season at 0-3150 m alt. Flowering all the year round.
- Backer , C. A. & R. C. Bakhuizen Van Den Brink. 1965. Flora of Java Vol. N.V. P. Noordhoff. Groningen, Netherlands.
- Barnes, D.E. & L. G. Chan. 1990. Common Weeds of Malaysia and their Control. Ancom Berhad, Persiaran Selangor. 40000 Shah Alam, Malaysia
- Soerjani, M., A. J. G. H. Kostermans & Gembong Tjitrosoepomo (Eds.). 1987. Weeds of Rice in Indonesia. Balai Pustaka. Jakarta.
- 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