Invasive Alien Species

Species Name: Chromolaena odorata

Family Name:
Asteraceae /Compositae
Eupatorium odoratum L.
Central and South America
Perennial, It form dense tangled bushes 1.5-2.0 m 1.5 – 2.0 m tall. very occasionally reaching a maximum of 6-8 m as a climber on other plants.  Leaves  opposite, reddish brown when young, ovate-deltoid to triangular oblong, 7.5-12 x 2.5-7 cm, margin toothed, young leaves have an odor when crushed. Flowers terminal or axillary,  homogamous, 20-35 flowered,  in up to 15 cm on wide flat topped corymbs; involucre bracts 5-seriate, imbricate, flower heads many, shortly stalked,  light purple to bluish white, slightly fragran. Achenes linear, angled, brown or black, 5 mm long. Pappus white of rough bristles, 5 mm long.
Invaded Habitat:
Well-drained sites, sunny or sligtly shaded areas abandoned land, wastelands, an aggressive invader of pastures, plantation crops. Serious problems of C. odorata found in Pananjung, Pangandaran Nature Reserve an area for conserving banteng (Bos  javanicus, Bovidae)  and  Ujung Kulon Nature reserve in West Java,  and grassland of East Nusa Tenggara. The occupation of C. odorata reducing the grazing area and suffering the conserve animals.
Firstly known  in 1934 from Lubuk Pakam, Nort Sumatra.  It is now spread all over the islands of Indonesia, from Aceh to Papua.
Its growth is optimal in open area or in partial shade. Occurs from 50-1000 m altitude. Normally it reproduces by seeds (achenes) which are dispersed by wind. It reproduces also asexually by root and stem cuttings.  Large roots, left under the ground after mechanical control by digging and pulling are capable of producing shoots.  Stems that have been slashed can produce roots and can grow when placed directly on top of bare soil under favorable wheather conditions.
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