A single canyon can host both Pacific and Atlantic floras.

Evidence

And there, for a mile or two in a sheltered spot, owing to the more southern latitude, the everlasting northern pine met the trees of other climates. There were dwarf oaks, willows, hazel, and spruce; the white cedar and the trailing juniper jostled each other for a precarious foothold; the majestic redwood tree of the Pacific met the exquisite balsam pine of the Atlantic slopes, and among them all the pale gold foliage of the large aspen trembled (as the legend goes) in endless remorse. And above them towered the toothy peaks of the glittering mountains, rising in pure white against the sunny blue. — Isabella L. Bird, A Lady’s Life in the Rocky Mountains, 177

Categorization

• CANDY: A sheltered mile where redwoods and balsam pines grow side by side is an easy, striking fact to repeat.
• SEED: Essay angle: ‘The Mile Where Two Forests Meet’ — microclimate as a hidden engine of biological mixing.