What is "solah"

Sola \So"la\, n. [Native name.] (Bot.) A leguminous plant ( [AE]schynomene aspera) growing in moist places in Southern India and the East Indies. Its pithlike stem is used for making hats, swimming-jackets, etc. [Written also solah, shola.]

n. A tall plant growing in the swamps of India; its pith is used to make hats.