Adventive on Pitcairn and Oeno islands, established taxa that were not deliberately introduced (Florence, J., Waldren, S. & Chepstow-Lusty, A.J. (1995)The flora of the Pitcairn Islands: a review, Biological Journal of the Linnean Society, 56, pp. 79119.); ?Extinct on Henderson. (Waldren, S., Wesiler, M.I., Hather, J.G. & Morrow, D. (1999)The non-native vascular plants of Henderson Island, South Central Pacific Ocean, Atoll Research Bulletin, 463, pp. 114. Available at: https://doi.org/10.5479/si.00775630.463.1);
Invasive. (Christian, M., Warren, J., Warren, C., Myer, B., Moverly, D., Wong, L. J. & Pagad, S. (2022) Global Register of Introduced and Invasive Species - Pitcairn Islands - Great Britain. Version 1.7. Invasive Species Specialist Group ISSG. Checklist dataset.; Waldren, S., Wesiler, M.I., Hather, J.G. & Morrow, D. (1999)The non-native vascular plants of Henderson Island, South Central Pacific Ocean, Atoll Research Bulletin, 463, pp. 114. Available at: https://doi.org/10.5479/si.00775630.463.1);
Terrestrial.
The fruiting spikelets have bristles with reflexed teeth that readily attach to clothing. Weedy species which may have been deliberately or accidentally introduced to Henderson. (Waldren, S., Wesiler, M.I., Hather, J.G. & Morrow, D. (1999)The non-native vascular plants of Henderson Island, South Central Pacific Ocean, Atoll Research Bulletin, 463, pp. 114. Available at: https://doi.org/10.5479/si.00775630.463.1);
Christian, M., Warren, J., Warren, C., Myer, B., Moverly, D., Wong, L. J. & Pagad, S. (2022) Global Register of Introduced and Invasive Species - Pitcairn Islands - Great Britain. Version 1.7. Invasive Species Specialist Group ISSG. Checklist dataset.; Florence, J., Waldren, S. & Chepstow-Lusty, A.J. (1995)The flora of the Pitcairn Islands: a review, Biological Journal of the Linnean Society, 56, pp. 79119.; Waldren, S., Wesiler, M.I., Hather, J.G. & Morrow, D. (1999)The non-native vascular plants of Henderson Island, South Central Pacific Ocean, Atoll Research Bulletin, 463, pp. 114. Available at: https://doi.org/10.5479/si.00775630.463.1; Fosberg, F.R., Sachet, M.H. & Stoddart, D.R. (1983)Henderson Island (Southeastern Polynesia): summary of current knowledge, Atoll Research Bulletin, 272, pp. 147. Available at: https://doi.org/10.5479/si.00775630.272.1; UKOTs Team (2024). UKOTs Online Herbarium - Pitcairn. Facilitated by the Royal Botanic Gardens, Kew. Published on the internet at http://brahmsonline.kew.org/UKOT (July 2024); UKOTs Team (2024). UKOTs Online Herbarium - Oeno. Facilitated by the Royal Botanic Gardens, Kew. Published on the internet at http://brahmsonline.kew.org/UKOT (July 2024);