Yes, CALISAYAS is a Scrabble word!

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

Is it a valid word?

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

Peruvian shrub or small tree having large glossy leaves and cymes of fragrant yellow to green or red flowers; cultivated for its medicinal bark

Also: cinchona officinalis, cinchona ledgeriana, cinchona calisaya.