Lagenaria siceraria
Still at the altar of 瓜, we come across these.
This is calabash, bottle gourd, white-flowered gourd, long melon, New Guinea bean or Tasmania bean. In Chinese, 葫芦(瓜)/葫蘆(瓜) (Mand: hú lú (guā); Cant: wu4 lou4*2 (gwaa1)) or 葫子(瓜) (Mand: hú zi (guā); Cant: wu4 zi2 (gwaa1)). The gua character is sometimes dropped in this type. They come in many shapes, but this is the most common round here.
Like most of the vegetable gua family, these are used in soups and hot pots, but also stir fried.