| Campanulaceae | |
Lobelia laxiflora fo. angustifolia
| (A. DC.) Voss | Vilm. Blumengärtn. ed. 3 1: 576 | 1894 |
| Campanulaceae | |
Lobelia laxiflora subsp. angustifolia
| (A. DC.) Eakes & Lammers | Novon 9(3): 384 | 1999 |
| Campanulaceae | |
Lobelia laxiflora var. angustifolia
| A. DC. | Prodr. 7(2): 383 | 1839 |
| Campanulaceae | |
Lobelia laxiflora var. bicolor
| (D. Don) Endl. | Cat. Horti Vindob. 1: 436 | 1842 |
| Campanulaceae | |
Lobelia laxiflora fo. brevifolia
| (Zahlbr.) E. Wimm. | Pflanzenr. IV, 276b: 684 | 1953 |
| Campanulaceae | |
Lobelia laxiflora var. brevifolia
| Zahlbr. | Repert. Spec. Nov. Regni Veg. 14: 185 | 1915 |
| Campanulaceae | |
Lobelia laxiflora var. brevipes
| E. Wimm. | Pflanzenr. 276b(Heft 107): 683 | 1953 |
| Campanulaceae | |
Lobelia laxiflora var. cavanillesii
| (Cav.) Steud. | Nomencl. Bot. ed. 2, 2: 61 | 1841 |
| Campanulaceae | |
Lobelia laxiflora fo. concolor
| (M. Martens & Galeotti) E. Wimm. | Pflanzenr. IV. 276b(2): 684 | 1953 |
| Campanulaceae | |
Lobelia laxiflora fo. flava
| E. Wimm. | Pflanzenr. IV. 276b(2): 684 | 1953 |
| Campanulaceae | |
Lobelia laxiflora var. foliosa
| Zahlbr. | Repert. Spec. Nov. Regni Veg. 14: 185 | 1915 |
| Campanulaceae | |
Lobelia laxiflora fo. fragilis
| (B.L. Rob. & Fernald) E. Wimm. | Pflanzenr. IV, 276b: 682 | 1953 |
| Campanulaceae | |
Lobelia laxiflora var. insignis
| Donn. Sm. | Bot. Gaz. 16(1): 12 | 1891 |
| Campanulaceae | |
Lobelia laxiflora fo. lanceolata
| (Hook. & Arn.) E. Wimm. | Pflanzenr. IV, 276b: 683 | 1953 |
| Campanulaceae | |
Lobelia laxiflora fo. laxiflora
| | | |
| Campanulaceae | |
Lobelia laxiflora subsp. laxiflora
| | | |
| Campanulaceae | |
Lobelia laxiflora var. laxiflora
| | | |
| Campanulaceae | |
Lobelia laxiflora fo. lutea
| Standl. & Steyerm. | Publ. Field Mus. Nat. Hist., Bot. Ser. 23(2): 98 | 1944 |
| Campanulaceae | * |
Lobelia laxiflora fo. lutea
| (F. Haage & F. Schmidt) E. Wimm. | Pflanzenr. IV, 276b: 682 | 1953 |
| Campanulaceae | |
Lobelia laxiflora fo. magna
| (E. Wimm.) E. Wimm. | Pflanzenr. IV, 276b: 684 | 1953 |
| Campanulaceae | |
Lobelia laxiflora var. mollis
| (Vatke) Zahlbr. | Repert. Spec. Nov. Regni Veg. 14: 185 | 1915 |
| Campanulaceae | |
Lobelia laxiflora var. nelsonii
| (Fernald) McVaugh | Ann. Missouri Bot. Gard. 27: 349 | 1940 |
| Campanulaceae | |
Lobelia laxiflora var. patula
| (Planch. & Oerst.) E. Wimm. | Pflanzenr. IV. 276b(2): 683 | 1953 |
| Campanulaceae | |
Lobelia laxiflora var. petiolata
| E. Wimm. | Ann. Naturhist. Mus. Wien 56: 369 | 1948 |
| Campanulaceae | |
Lobelia laxiflora var. stricta
| (Planch. & Oerst.) McVaugh | N. Amer. Fl. 32A(1): 96 | 1942 [1943] |