| Stable identifier | Scientific Name | Media |
| https://herbarium.bgbm.org/object/B100002814 | Cestrum bahamense Britton |
|
| https://herbarium.bgbm.org/object/B100004456 | Canella winterana (L.) Gaertn. |
|
| http://herbarium.bgbm.org/object/B200107701 | Isoëtes jamaicensis Hickey |
|
| https://herbarium.bgbm.org/object/B100217255 | Manilkara kauki (L.) Dubard |
|
| https://herbarium.bgbm.org/object/B100247942 | Lantana involucrata L. |
|
| https://herbarium.bgbm.org/object/B100086136 | Nectandra coriacea |
|
| https://herbarium.bgbm.org/object/B100158608 | Merremia |
|
| https://herbarium.bgbm.org/object/B100256384 | Aristolochia petandra Jacq. |
|
| http://herbarium.bgbm.org/object/B100089441 | Cynanchum inaguense (Vail) R. A. Howard & Dunbar |
|
| https://herbarium.bgbm.org/object/B100467845 | Argythamnia candida Sw. |
|
Claimed natural history specimens collected or identified by William Thomas Gillis
| Scientific Name | Country | Institution | Date |
| Aristolochia petandra Jacq. | Bahamas | B | |
| Canella winterana (L.) Gaertn. | Bahamas | B | |
| Cestrum bahamense Britton | Bahamas | B | 1970-12-11 |
| Cynanchum inaguense (Vail) R. A. Howard & Dunbar | Bahamas | B | 1970-06-10 |
| Manilkara kauki (L.) Dubard | USA | B | 1971-03-11 |
| Nectandra coriacea | Bahamas | B | 1974-05-24 |
| Argythamnia candida Sw. | Bahamas | B | 1976-02-29 |
| Lantana involucrata L. | Turks and Caicos Islands | B | 1978-04-01 |
| Isoëtes jamaicensis Hickey | Jamaica | B | |
| Merremia | Bahamas | B |