Overview
The Scrub Hickory (Carya floridana), also known as the Florida Hickory, is a fascinating, fire-adapted hardwood tree found naturally nowhere else in the world outside the ancient white-sand ridges of the central Florida peninsula. Adapted to endure the extreme nutrient deficiency, searing drought, and frequent lightning wildfires of the Florida scrub, it is a botanical signature of the prehistoric Lake Wales Ridge.
Biology and Physical Characteristics
Growing as a multi-stemmed large shrub or small tree reaching 3 to 15 meters, the Scrub Hickory features dark, rough, scaly grey bark. Its expanding spring buds and young branchlets are densely coated in shimmering, rusty-brown to golden peltate scales. Its alternate pinnately compound leaves consist of 3 to 7 (usually 5) tough, leathery leaflets. Its small, rounded nuts are enclosed in a thin, scurfy, yellowish-glandular husk that splits to the base, revealing a sweet, edible kernel.
Behavior and Ecology
A master of fire survival, the Scrub Hickory invests massive energy into a subterranean swollen root crown (lignotuber) that can weigh hundreds of pounds. When lightning wildfires sweep through the scrub, completely incinerating its aboveground stems, the underground root crown resprouts vigorously within weeks, producing fast-growing new shoots from protected dormant buds.
Conservation and Human Impact
Assessed as Least Concern by the IUCN, the Scrub Hickory is nonetheless confined to one of the most endangered ecosystems in North America. Massive citrus grove expansion and intensive residential development across central Florida have eliminated large portions of ancient scrub habitat.
Interesting Factoid
The Scrub Hickory is virtually immortal to fire: a lightning wildfire can incinerate its entire trunk and leaves down to white ash, but within days vigorous green shoots burst straight out of its subterranean fireproof root crown.