| Campanulaceae | |
Roella alpina
| Bond | J. S. African Bot. 6: 61 | 1940 |
| Campanulaceae | |
Roella amplexicaule
| | | |
| Campanulaceae | |
Roella amplexicaulis
| Wolley-Dod | J. Bot. 39: 400 | 1901 |
| Campanulaceae | |
Roella angustifolia
| Roxb. | Tracts St. Helena 320 | 1816 |
| Campanulaceae | |
Roella arenaria
| Schltr. | Bot. Jahrb. Syst. Syst 27: 193. | |
| Campanulaceae | |
Roella bracteata
| (Thunb.) A. DC. | Monogr. Campan. 179 | 1830 |
| Campanulaceae | |
Roella bryoides
| H. Buek | Enum. Pl. Afr. Austral. 386 | 1837 |
| Campanulaceae | |
Roella campestris
| A. DC. | Prodr. 7: 447 | 1839 |
| Campanulaceae | ** |
Roella cernua
| Brouss. | Elench. Horti Bot. Monspel. 49 | 1805 |
| Campanulaceae | |
Roella ciliata
| L. | Sp. Pl. 1: 170 | 1753 |
| Campanulaceae | |
Roella cinerea
| (L. f.) A. DC. | Monogr. Campan. 175 | 1830 |
| Campanulaceae | |
Roella compacta
| Schltr. | Bot. Jahrb. Syst. 27: 193 | 1900 |
| Campanulaceae | |
Roella cuspidata
| Adamson | J. S. African Bot. 17: 151 | 1951 |
| Campanulaceae | ** |
Roella decumbens
| Loudon | Hort. Brit. 77 | 1830 |
| Campanulaceae | * |
Roella decurrens
| Andrews | Bot. Repos. 4: t. 238 | 1802 |
| Campanulaceae | |
Roella decurrens
| L'Hér. | | |
| Campanulaceae | |
Roella dregeana
| DC. | Prodr. 7: 446 | 1839 |
| Campanulaceae | |
Roella dunantii
| A. DC. | | |
| Campanulaceae | |
Roella eckloniana
| H. Buek | Enum. Pl. Afr. Austral. 385 | 1837 |
| Campanulaceae | |
Roella elegans
| Paxton | Paxton's Mag. Bot. 6: 27 | 1839 |
| Campanulaceae | |
Roella ericoides
| (Lam.) Spreng. | Syst. Veg. [Sprengel] 1: 723 | 1825 [1824] |
| Campanulaceae | * |
Roella ericoides
| R.D. Good | J. Bot. 62: 48 | 1924 |
| Campanulaceae | * |
Roella ericoides
| H. Buek | Enum. Pl. Afr. Austral. 385 | 1837 |
| Campanulaceae | |
Roella ericoides
| R.D. Good | | |
| Campanulaceae | |
Roella filiformis
| Lam. | | |
| Campanulaceae | |
Roella glabra
| Poir. | | |
| Campanulaceae | |
Roella glauca
| H. Buek | Enum. Pl. Afr. Austral. 387 | 1837 |
| Campanulaceae | |
Roella glomerata
| A. DC. | | |
| Campanulaceae | |
Roella goodiana
| Adamson | | |
| Campanulaceae | |
Roella gracilis
| Eckl. & Zeyh. | Enum. Pl. Afr. Austral. 385 | 1837 |
| Campanulaceae | |
Roella incurva
| A. DC. | Monogr. Campan. 172 | 1830 |
| Campanulaceae | |
Roella insizwae
| Zahlbr. | | |
| Campanulaceae | |
Roella latiloba
| A. DC. | | |
| Campanulaceae | |
Roella leptosepala
| Sond. | Fl. Cap. iii 593. | |
| Campanulaceae | |
Roella lightfootioides
| Schltr. | Bot. Jahrb. Syst. 24: 445 | 1898 |
| Campanulaceae | |
Roella linifolia
| Roxb. | Tracts St. Helena 321 | 1816 |
| Campanulaceae | |
Roella maculata
| Adamson | | |
| Campanulaceae | |
Roella minor
| Eckl. ex H. Buek | Enum. Pl. Afr. Austral. 385 | 1837 |
| Campanulaceae | |
Roella muscosa
| L. f. | Suppl. Pl. 143 | 1781 [1782] |
| Campanulaceae | |
Roella nitida
| Schltr. | Bot. Jahrb. Syst. Syst 24: 446. | |
| Campanulaceae | |
Roella paniculata
| Roxb. | Tracts St. Helena 320 | 1816 |
| Campanulaceae | |
Roella pedunculata
| P.J. Bergius | Descr. Pl. Cap. 42 | 1767 |
| Campanulaceae | ** |
Roella prostrata
| Eckl. & Zeyh. | Enum. Pl. Afr. Austral. 387 | 1837 |
| Campanulaceae | |
Roella prostrata
| E. Mey. ex DC. | Prodr. 7: 447 | 1839 |
| Campanulaceae | |
Roella psammophila
| Schltr. | Bot. Jahrb. Syst. 24: 446–447 | 1898 |
| Campanulaceae | |
Roella recurvata
| A. DC. | | |
| Campanulaceae | |
Roella reticulata
| A. DC. | | |
| Campanulaceae | |
Roella reticulata
| L. | Sp. Pl. 170 | 1753 |
| Campanulaceae | |
Roella rhodantha
| Adamson | J. S. African Bot. 17: 135 | 1951 |
| Campanulaceae | |
Roella secunda
| H. Buek | Enum. Pl. Afr. Austral. 386 | 1837 |
| Campanulaceae | |
Roella spicata
| L. f. | Suppl. Pl. 143 | 1781 [1782] |
| Campanulaceae | |
Roella squarrosa
| P.J. Bergius | Descr. Pl. Cap. 42 | 1767 |
| Campanulaceae | |
Roella tenuifolia
| (L. f.) Thunb. | Fl. Cap. ed. 2: 28 | 1823 |
| Campanulaceae | |
Roella thunbergii
| (Roem. & Schult.) A. DC. | Monogr. Campan. 174 | 1830 |
| Campanulaceae | |
Roella triflora
| Adamson | | |