becoming professor of botany. As a teacher both in the classroom and in the field he was eminently successful. He was a correspondent of John James Audubon who in 1829 named Henslow's sparrow (Centronyx henslowii) after him.

From 1821 Henslow had begun organising a herbarium of British flora, supplementing his own collecting with a network which expanded over time to include his friends and family, and the botanists