Answer:

sumac

Answer	Crossword Clue
SUMAC	Poison ...
SUMAC	Singer Yma
SUMAC	Itch-producing plant

SUMAC	Rash producer
SUMAC	Cashew cousin
SUMAC	Poison ivy relative
SUMAC	Lacquer source
SUMAC	Shrub that can cause dermatitis
SUMAC	Squawbush, e.g.
SUMAC	Shrub often toxic
SUMAC	It may elicit a rash response

SUMAC	Shrub of the genus "Rhus"
SUMAC	Poison ivy kin
SUMAC	Poisonous shrub
SUMAC	Yma with a notable range
SUMAC	"Poison" shrub
SUMAC	Cashew family shrub
SUMAC	Poison ..
SUMAC	Poison ivy's cousin

SUMAC	"Poison" plant
SUMAC	Rash source, maybe
SUMAC	Shrub of the cashew family
SUMAC	Poison plant
SUMAC	Shrub that may be poisonous
SUMAC	Poison ... (irritating shrub)
SUMAC	Singer Yma from Peru
SUMAC	Poison ... (shrub)

SUMAC	Tree in the cashew family
SUMAC	Tree with toxic leaves
SUMAC	Source of lacquer, varnish, or tannin
SUMAC	Poison ivy cousin
SUMAC	Poison ... (toxic plant)
SUMAC	Itch-inducing shrub
SUMAC	Memorable entertainer
SUMAC	Rash cause, perhaps

SUMAC	Small tree
SUMAC	Poison shrub
SUMAC	Poison ivy is one
SUMAC	Poison tree
SUMAC	Peruvian singer