野西瓜苗（学名：Hibiscus trionum），又名香铃草、**葵、打瓜花、山西瓜秧，是一种锦葵科木槿属一年生草本植物。

野西瓜苗的分枝横升或斜升，半空心，上有白色开叉的细毛，高约20-50cm，但亦有高至80cm或1米的。叶3至5个掌状全裂或深裂，裂片倒卵形，裂片再羽状分裂；两面具星状刺毛。花单生于叶腋，花冠外表黄色、内里酒红色，雌雄同体，柱头长约1.1cm，亦是酒红色。分果瓣5枚。

野西瓜苗原生于地中海东部，但后来在南欧扩散。虽然被当中野草处理，亦有当作观赏植物种在后园的。由于人口的移动，这种植物目前已从欧洲扩散到北美。

Hibiscus trionum, commonly called flower-of-an-hour, bladder hibiscus, bladder ketmia, bladder weed, flower-of-the-hour, modesty, puarangi, shoofly, and venice mallow, is an annual plant native to the Levant. It has spread throughout southern Europe both as a weed and cultivated as a garden plant. It has been introduced to the United States as an ornamental where it has become naturalized as a weed of cropland and vacant land, particularly on disturbed ground.