Yes, CORYDALIS is a Scrabble word!

Letter values in Scrabble US: C 3, O 1, R 1, Y 4, D 2, A 1, L 1, I 1, S 1.

Is it a valid word?

CORYDALIS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a plant of the genus Corydalis with beautiful compound foliage and spurred tubular flowers
annual or perennial herbs of Himalayan China and South Africa
type genus of the Corydalidae

Also: genus corydalis, genus corydalus.

Not playable in Scrabble US: CORYDALUS.