Invasive Alien Species
Species Name: Polytrias amaura
- Family Name:
- Polytrias praemorsa (Nees) Hack
Andropogon amaurus Buese
Eulalia amaura (Buese) Ohwi
E. praemorsa (Nees) Stapf ex Ridl.
- Perennial, forming dense mats, often stoloniferous, 10-40 cm tall. Stem erect, with reclining or creeping base. Leaf sheaths 2-3 cm long, tight, purplish; ligule very short membranous; blade flat, narrow, ovate-lanceolate, 1.5-7 cm x 1-7 mm. Inflorescence terminal, spike-like raceme, densely brown; spikelet in whorls of 3 at each node, 2 sessile and one stalked; both sessile spikelet dropping together with the internodes, the stalk one separately; sessile spikelet oblong 3.5-4.5 mm long, pedicelled spikelet silimar to the sessile one but often slightly smaller and sometimes male instead of bisexual. Caryopsis oblong to obovate 1.5-1.75 mm long.
- Invaded Habitat:
- Grassy sites, road sides, lawns, upland rice fields.
- Throughout Indonesia except Mollucas as far as known.
- Sunny to lightly shaded, dry, on light or heavy, usually infertile soils; ofteh so abundant that the area has brown red during flowering. Up to 1600 m altitude.
- Backer , C. A. & R. C. Bakhuizen Van Den Brink. 1965. Flora of Java Vol. III. N.V. P. Noordhoff. Groningen, Netherlands
- Soerjani, M., A. J. G. H. Kostermans & Gembong Tjitrosoepomo (Eds.). 1987. Weeds of Rice in Indonesia. Balai Pustaka. Jakarta.