未熟な緑色をした瓢箪 (ヒョウタン) のこと。瓢箪は、秋に収穫を迎える。青瓢は初秋の季語

 

“Ao-Fukube”

Fukube (瓢) is Calabash (Lagenaria siceraria), also known as bottle gourd, and harvested in autumn.

青瓢 means immature green-colored calabash.