J. L. (John Leonard) Knapp

Born in Shenley, Buckinghamshire, in 1767, this English botanist and naturalist was the son of a clergyman. He was educated at Thame grammar school, briefly entered the navy, and later served in the Herefordshire and Northamptonshire militia, eventually becoming a captain.

He became especially known for his botanical work and for long collecting trips, including an excursion in Scotland with botanist George Don. His best-known book, Journal of a Naturalist (first published anonymously in 1829), won readers with its warm, observant blend of natural history and everyday country life.

He is also remembered for his work on British grasses, an area in which he collected rare native species and built a strong reputation among naturalists. I couldn't confirm a suitable portrait image from reliable page images, so no profile image is included here.