Rubiaceae | |
Houstonia pusilla fo. albiflora
| Standl. | Rhodora 34(405): 177 | 1932 |
Rubiaceae | * |
Houstonia pusilla fo. albiflora
| Wunderlin & M. Hopkins | Trans. Illinois State Acad. Sci. 59: 386 | 1966 |
Rubiaceae | |
Houstonia pusilla fo. rosea
| Steyerm. | Rhodora 41(492): 585 | 1939 |