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空心莲子草Alternanthera philoxeroides属苋科,具有繁殖迅速、适应性强等特点。原产南美洲;1897年在美国首次发现;1946年在澳大利亚发现后,短期内即扩展蔓延到新西兰、缅甸、泰国、印尼、印度等许多国家,现已传播到非洲等地。在这些国家里,空心莲子草常覆盖水面和地面,影响作物生长和水产养殖;堵塞航道,影响水运和农田排灌;污染环境,甚至影响旅游业和国防战备。
Alternanthera philoxeroides Alternanthera philoxeroides is amaranth, with rapid propagation, adaptability and other characteristics. Originally South America; first discovered in the United States in 1897; found in Australia in 1946, the short term expansion that has spread to New Zealand, Myanmar, Thailand, Indonesia, India and many other countries, has now spread to Africa and other places. In these countries, Alternanthera philoxeroides covers the surface and ground, affecting crop growth and aquaculture; blocking waterways, affecting water transport and cropland irrigation and drainage; and polluting the environment, even affecting tourism and defense readiness.