Yes, OCOTILLOS is a Scrabble word!

Letter values in Scrabble US: O 1, C 3, O 1, T 1, I 1, L 1, L 1, O 1, S 1.

Is it a valid word?

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

desert shrub of southwestern United States and Mexico having slender naked spiny branches that after the rainy season put forth foliage and clusters of red flowers

Also: jacob's staff, vine cactus, fouquieria splendens.

Not playable in Scrabble US: COACHWHIP.