Invasive Alien Species

Species Name: Rotala mexicana

Family Name:
Central America
Fragile herb, 5-12 cm tall, with erect or ascending stems or creeping and producing erect branches. Leaves in whorls of 3-4, linear-lanceolate, entire, 5-10 x 1-1.5 mm. Inflorescence solitary, axillary, sessile, bisexual, actinomorphic, 3-5 merous; bracteoles at the calyx base, slightly longer than the flowers; calyx 1-1.25 mm high, tube campanulate, lobes 5; accessory lobes and petals absent;  stamen 2-3, not longer than calyx lobes; ovary broadly ovoid-globose; stigma almost sessile. Fruit capsule 1-2.25 mm long, 3-valved; seeds small
Invaded Habitat:
Soggy fields, race fields
Java and Papua
Occurs at 0-1200 m altitude
  1. Backer , C. A. & R. C. Bakhuizen Van Den Brink.  1963. Vol. I.  Flora of Java.  Vol. I.  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.