| Psychotria sessilifolia M. Martens & Galeotti, 1844 |
| Psychotria siggersiana Standl., 1925 |
| Psychotria simiarum Standl., 1929 |
| Psychotria simiarum subsp. chiapensis C.M. Taylor, 2004 |
| Psychotria simiarum subsp. simiarum Standl., 1929 |
| Psychotria skutchii Standl., 1937 |
| Psychotria sousae Lorence & Dwyer, 1987 |
| Psychotria steyermarkii Standl., 1940 |
| Psychotria stipulata (Oerst.) Hemsl., 1881 |
| Psychotria subsessilis Benth., 1853 |
| Psychotria tenuifolia Sw., 1788 |
| Psychotria tetrapyrena (Urb.) Urb., 1921 |
| Psychotria thornei Lorence, 1994 |
| Psychotria tolimensis Wernham, 1914 |
| Psychotria tomentosa Hemsl., 1881 |
| Psychotria trichotoma M. Martens & Galeotti, 1844 |
| Psychotria trispicata Griseb., 1862 |
| Psychotria uliginosa Sw., 1788 |
| Psychotria undata Jacq., 1798 |
| Psychotria uyucana Standl., 1950 |