| Convolvulaceae | |
Lettsomia aggregata
| Roxb. | Fl. Ind. 1: 488 | 1832 |
| Convolvulaceae | |
Lettsomia argentea
| Roxb. | Fl. Ind. 2: 79 | 1824 |
| Convolvulaceae | |
Lettsomia atropurpurea
| (Wall.) C.B. Clarke | Fl. Brit. India 4(10): 194 | 1883 |
| Convolvulaceae | |
Lettsomia bella
| C.B. Clarke | Fl. Brit. India 4: 192 | 1883 |
| Convolvulaceae | |
Lettsomia bona-nox
| Roxb. | Fl. India, ser. 2 2: 84 | 1824 |
| Convolvulaceae | |
Lettsomia capitata
| (Vahl) Blume | Gen. 2: 870 | |
| Convolvulaceae | |
Lettsomia capitiformis
| (Poir.) Kerr | Fl. Siam. Enum. 3(2): 30 | 1954 |
| Convolvulaceae | |
Lettsomia chalmersii
| Hance | J. Bot. 16(188): 230–231 | 1878 |
| Convolvulaceae | ** |
Lettsomia championi
| (Benth.) Benth. & Hook. f. | Gen. 2: 879 | 1876 |
| Convolvulaceae | |
Lettsomia cuneata
| (Willd.) Roxb. | Fl. Ind. 2: 81 | 1824 |
| Convolvulaceae | |
Lettsomia cymosa
| Roxb. | Fl. Ind. 2: 82 | 1824 |
| Convolvulaceae | |
Lettsomia elliptica
| Wight | Fl. Brit. India 4: 192 | 1883 |
| Convolvulaceae | |
Lettsomia festiva
| (Wall.) Benth. & Hook. f. | Gen. 2: 870 | |
| Convolvulaceae | |
Lettsomia henryi
| (Craib) Kerr | Fl. Siam. Enum. 3(2): 30 | 1954 |
| Convolvulaceae | |
Lettsomia lanceolata
| (Choisy) Kerr | Fl. Siam. Enum. 3(2): 33 | 1954 |
| Convolvulaceae | |
Lettsomia longifolia
| Collett & Hemsl. | J. Linn. Soc., Bot. 28: 95 | 1890 |
| Convolvulaceae | |
Lettsomia mastersii
| Prain | J. Asiat. Soc. Bengal 63: 98 | 1894 |
| Convolvulaceae | |
Lettsomia maymyo
| W.W. Sm. | Rec. Bot. Surv. India 6(2): 38 | 1914 |
| Convolvulaceae | |
Lettsomia nervosa
| (Burm. f.) Roxb. | Fl. Ind. 2: 78 | 1824 |
| Convolvulaceae | |
Lettsomia ornata
| Roxb. | Fl. India, ser. 2 2: 86 | 1824 |
| Convolvulaceae | |
Lettsomia peguensis
| C.B. Clarke | Fl. Brit. India 4(10): 193 | 1883 |
| Convolvulaceae | |
Lettsomia pomacea
| Roxb. | Fl. India, ser. 2 2: 83 | 1824 |
| Convolvulaceae | |
Lettsomia rubens
| (Choisy) C.B. Clarke | Fl. Brit. India 4: 195 | 1885 |
| Convolvulaceae | |
Lettsomia seguinii
| H. Lév. | Repert. Spec. Nov. Regni Veg. 9(222–226): 452 | 1911 |
| Convolvulaceae | |
Lettsomia setosa
| Roxb. | Fl. India, ser. 2 2: 80 | 1824 |
| Convolvulaceae | |
Lettsomia sikkimensis
| C.B. Clarke | Fl. Brit. India 4: 194 | 1883 |
| Convolvulaceae | |
Lettsomia splendens
| Roxb. | Fl. Ind. 1: 487 | 1832 |
| Convolvulaceae | |
Lettsomia strigosa
| Roxb. | Fl. Ind. 1: 491 | 1832 |
| Convolvulaceae | |
Lettsomia sumatrana
| Miq. | Fl. Ned. Ind., Eerste Bijv. (Suppl.) (3): 560 | 1860 [1861] |
| Convolvulaceae | |
Lettsomia uniflora
| Roxb. | Fl. India, ser. 2 2: 85 | 1824 |