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- Soulsby, Basil Harrington, 1864-1933
- Souma, Jun
- Soumis, Nicolas
- Soumoff, Cynthia
- Soumwell, Thomas
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- Soundview Nurseries,
- Soungatoulline, R K H
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- Souny, J
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- Sourav, Md Sharif Hossain
- Sourdis, Henri d'Escoubleau de, 1593-1645
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- Sousa, BM
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- Sousa, Danielle de
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- Sousa, Gladys Ferreira de
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- South Africa. Department of Agricultural Technical Services. Division of Botany.
- South Africa. Department of Agriculture and Forestry. Division of Botany and Plant Pathology.
- South Africa. Department of Agriculture and Forestry. Division of Plant Industry.
- South Africa. Department of Agriculture. Division of Botany and Plant Pathology.
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- South Dakota.
- South Dakota. Dept. of Public Instruction.
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- South Kensington Museum, London. Bethnal Green Branch.
- South Kensington Museum.
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- South Kenyon Nursery.
- South London Entomological and Natural History Society
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