Invasive Alien Species
Species Name: Ageratum houstonianum
- Family Name:
- Ageratum mexicanum Sims
- Tropical America
- Annual herb, erect, sometimes creeping and rooting at the base, up to 60 cm tall. Stem white hairy, with many ascending branches. Lower leaves opposite, long-stalked, the upper leaves alternate, short stalked; blade ovate-triangular, uppermost ones ovate, 2-10 x 1.5-5.5 cm, both surfaces sparsely hairy, the margin toothed. Inflorescence in terminal clusters of flower heads, 75-100 flowered; involucral bracts with long, short and glandular hairs; receptacles rounded without scales; all flowers the same; corolla tubular with a 5-lobed limb, blueish-violet; style with two long and far exerted arms, of the same color as the corolla. Achenes long, narrow, 5-angled; pappus 5 whitish scales
- Invaded Habitat:
- Fallow fields, road sides, waste places, gardens, under pine trees, tea and coffee plantations
- Java, Sumatra as far as known
- On dry to moist, fertile to moderately fertile soils, in the open or lightly shaded, less often on regularly cultivated fields at 200-1650 m altitude
- Backer , C. A. & R. C. Bakhuizen Van Den Brink. 1965. Flora of Java. N.V. P. Noordhoff. Groningen, Netherlands
- Everaarts, A.P. 1981. Weeds of vegetables in the highlands of Java.
LembaGA Penelitian Hortikultura, Pasar Minggu, Jakarta.
- Voogd, C.N.A. de. 1950. Tanaman Apakah Ini Gerangan. Buku kecil untuk taman berkelana. N.V. Uitgeverij W. van Hoeve, Bandung’s Gravenhage (translated by Soetan Sanif)