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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

Botanist

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

Botanist, writer, diplomat, art collector

Botanist

Danish botanist and explorer

Botanist

American ichthyologist and educator

American sociologist and paleontologist

Civil servant, political reformer and amateur biologist

American writer

British birth control campaigner and paleontologist

American forester and politician

British explorer, cartographer and naval officer

Botanist

American artist

Scottish photographer and botanist

American scientist and cytogeneticist

American ornithologist, naturalist, and painter

Irish botanist and mycologist, born 1872

Military leader, politician and statesman from South Africa

Botanist

Botanist

English children's writer and illustrator

German duke and naturalist

British explorer

Indian botanist

British statesman who founded Singapore

Chinese mycologist and phytopathologist

English navigator and cartographer

Botanist