| Onagraceae | |
Kneiffia allenii
| Small | Bull. Torrey Bot. Club 23(5): 177 | 1896 |
| Onagraceae | |
Kneiffia angustifolia
| Spach | Nouv. Ann. Mus. Hist. Nat. 4(4): 367 | 1835 [1836] |
| Onagraceae | |
Kneiffia arenicola
| Small | Fl. S.E. U.S. 842, 1335 | 1903 |
| Onagraceae | |
Kneiffia brevistipata
| Pennell | Bull. Torrey Bot. Club 46(9): 369 | 1919 |
| Onagraceae | |
Kneiffia charlesii
| Lahman | Proc. Oklahoma Acad. Sci. 11: 35 | 1931 |
| Onagraceae | |
Kneiffia chrysantha
| (Michx.) Spach | Nouv. Ann. Mus. Hist. Nat. 4(4): 368 | 1835 [1836] |
| Onagraceae | |
Kneiffia depauperata
| Jenn. | J. Washington Acad. Sci. 10(16): 454 | 1920 |
| Onagraceae | * |
Kneiffia floribunda
| Spach | Hist. Nat. Vég. 4: 376 | 1835 |
| Onagraceae | |
Kneiffia fraseri
| (Pursh) Spach | Hist. Nat. Vég. 4: 375 | 1835 |
| Onagraceae | |
Kneiffia fruticosa
| (L.) Spach ex Raim. | Nat. Pflanzenfam. 96[III,7]: 214 | 1893 |
| Onagraceae | |
Kneiffia glauca
| (Michx.) Spach | Hist. Nat. Vég. 4: 374 | 1835 |
| Onagraceae | |
Kneiffia hybrida
| Small | | |
| Onagraceae | |
Kneiffia latifolia
| Rydb. | Torreya 27(5): 86–88, pl. 3 | 1927 |
| Onagraceae | |
Kneiffia linearifolia
| Spach | Ann. Sci. Nat., Bot., sér. 2, 4: 167 | 1835 |
| Onagraceae | |
Kneiffia linearis
| (Michx.) Spach | Hist. Nat. Vég. 4: 376 | 1835 |
| Onagraceae | |
Kneiffia linifolia
| (Nutt.) Spach | Nouv. Ann. Mus. Hist. Nat. 4(4): 368 | 1835 [1836] |
| Onagraceae | |
Kneiffia longipedicellata
| Small | Bull. Torrey Bot. Club 23(5): 178 | 1896 |
| Onagraceae | |
Kneiffia maculata
| Spach | Hist. Nat. Vég. 4: 375 | 1835 |
| Onagraceae | |
Kneiffia michauxii
| Spach | Ann. Sci. Nat., Bot., sér. 2, 4(3): 167 | 1835 |
| Onagraceae | |
Kneiffia perennis
| (L.) Pennell | Bull. Torrey Bot. Club 46(9): 372 | 1919 |
| Onagraceae | |
Kneiffia pilosella
| (Raf.) A. Heller | Cat. N. Amer. Pl. (ed. 2) 8 | 1900 |
| Onagraceae | |
Kneiffia pratensis
| Small | Fl. S.E. U.S. 842, 1335 | 1903 |
| Onagraceae | |
Kneiffia pumila
| (L.) Spach | Hist. Nat. Vég. 4: 377 | 1835 |
| Onagraceae | |
Kneiffia riparia
| (Nutt.) Small | Fl. S.E. U.S. 842 | 1903 |
| Onagraceae | |
Kneiffia semiglandulosa
| Pennell | Bull. Torrey Bot. Club 46(9): 369 | 1919 |
| Onagraceae | |
Kneiffia serotina
| (Lehm.) Bartl. | Index Seminum (Gottingen) 1837: 4 | 1837 |
| Onagraceae | |
Kneiffia sessilis
| Pennell | Bull. Torrey Bot. Club 46(9): 366–367 | 1919 |
| Onagraceae | |
Kneiffia spachiana
| (Torr. & A. Gray) Small | Bull. Torrey Bot. Club 23(5): 179 | 1896 |
| Onagraceae | |
Kneiffia subglobosa
| Small | Bull. Torrey Bot. Club 23(5): 177–178 | 1896 |
| Onagraceae | * |
Kneiffia suffruticosa
| Spach | Hist. Nat. Vég. 4: 374 | 1835 |
| Onagraceae | |
Kneiffia sumstinei
| Jenn. | Ann. Carnegie Mus. 3(4): 480–481, pl. 19 | 1906 |
| Onagraceae | |
Kneiffia tetragona
| (Roth) Pennell | Bull. Torrey Bot. Club 46(9): 370 | 1919 |
| Onagraceae | |
Kneiffia velutina
| Pennell | Bull. Torrey Bot. Club 46(9): 370 | 1919 |