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English naturalist and biologist

English writer and social critic

Prussian geographer, naturalist and explorer

United States Army general and explorer

African American botanist and inventor

Genevan philosopher, writer, and composer

German biologist, naturalist, philosopher, physician, and artist

Swedish botanist, physician, and zoologist

Italian Renaissance polymath

Botanist

Scottish-American naturalist

American explorer

English philosopher, biologist, sociologist, and prominent classical liberal political theorist

American ornithologist, marine biologist, entomologist, and explorer

German writer, artist, natural scientist and politician

English botanist and scientific translator

Botanist, writer, diplomat, art collector

Danish botanist and explorer

Botanist

Botanist

American ichthyologist and educator

American sociologist and paleontologist

Civil servant, political reformer and amateur biologist

American ethnobotanist and mystic

American evolutionary biologist

British birth control campaigner and paleontologist

Bulgarian king

British botanist

British explorer, cartographer and naval officer

American forester and politician

Botanist

American artist

American scientist and cytogeneticist

Scottish photographer and botanist

Chinese mycologist

American ornithologist, naturalist, and painter

Irish botanist and mycologist, born 1872

Military leader, politician and statesman from South Africa