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空心莲子草学名:Alternanthera philoxeroides(Martius)Grisebach(1879),苋科,黎目。常用名:螃蜞菊(Alligator weed)。空心莲子草是一种多年生具匍匐茎的杂草,以水生为主,立根于土壤或浅水底部的基质中。空心的茎秆从根段上发生,伸出水面,相互交织连片。该杂草还生长在沼泽地带和潮湿的草地上。茎秆平卧、偃伏或直立,不分枝或分枝,茂密,连片。每个茎节间有两条纵向对生的被茸毛的凹槽。直立茎深绿色,长可达70厘米:每个茎节上有一对叶片。平卧茎淡黄色、黄色或褐色到红色。在水中根相对短而细,而在土壤中根则变粗而长。根通常从茎节上长出。茎
Alternanthera philoxeroides (Martius) Grisebach (1879), Amaranthus, Lebanon. Common name: Alligator weed. Alternanthera philoxeroides is a perennial stoloniferous weed that is primarily aquatic, rooted in the matrix at the bottom of soil or shallow water. Hollow stems occur from the root segment, reaching out to the water, interwoven with contiguous pieces. The weeds also grow on wetlands and wet grass. Stem supine, volts or erect, not branched or branched, dense, contiguous. There are two longitudinally opposite fluffed grooves between each stem. Erect stems dark green, up to 70 cm long: a pair of leaves on each stem. Supine stem light yellow, yellow or brown to red. Roots are relatively short and thin in water, while roots are thick and long in soil. The root usually grows from the stem. stem