black spruce: small spruce of boggy areas of northeastern North America having spreading branches with dense foliage; inferior wood
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
reye's syndrome: acquired encephalopathy following acute viral infections (especially influenza or chicken pox) in young children; characterized by fever, vomiting, disorientation, coma, and fatty infiltration of the liver