seashore false bindweed
A coastal plant with pink, morning-glory-like flowers; scientific name Calystegia soldanella.
I found seashore false bindweed blooming on the sandy beach in summer.
Kanji spelling exists but the word is usually written in kana; learners will most often encounter the katakana form.
Compound of 浜 (hama, 'beach') and 昼顔 (hirugao, 'bindweed'), describing a bindweed that grows on sandy shores.