- Saint Paul (Minn.). Department of Public Works (4)
- Scott, George Bretin, 1873-1942 (1)
- Sem, 1863-1934 (2)
- Service, R. R. (1)
- Shedd, Charles C. (1)
- Shenandoah Nurseries (1)
- Sheridan, John E., 1880-1948 (1)
- Siler, Charles A. (2)
- Simay (1)
- Smith, B. W. (1)
- Smith, Jessie Willcox, 1863-1935 (1)
- Stanley, R. H. (1)
- Stark Bro's Nurseries (2)
- Stark, William P., Nurseries (1)
- Starrett, Oscar G. (1)
- Steele, Frederic Dorr, 1873-1944 (1)
- Stewart, W. R. (1)
