Camissonia
   chamaenerioides (Gray) Raven (desert evening primrose)

 Epilobium
   ciliatum subsp. ciliatum (transpecos w.)
   coloratum Biehler (purpleleaf w.)

 Gaura
   boquillensis Raven & Gregory (rio grande beeblossom)
   brachycarpa Small (plains gaura)
   calcicola Raven & Gregory (texas beeblossom)
   coccinea Nutt. ex Pursh (scarlet gaura, willowherb gaura, smooth gaura)
   demareei Raven & Gregory (demaree's beeblossom)
   drummondii (Spach) Torr. & Gray (sweet gaura, scented gaura)
   hexandra subsp. gracilis (Woot. & Standl.) Raven & Gregory
   lindheimeri Engelm. & Gray (white gaura, munz gaura)
   longiflora Spach (kearney gaura, tall gaura)
   macrocarpa Rothrock (transpecos gaura)
   mckelveyae (Munz) Raven & Gregory (mckelvey's beeblossom)
   mollis James (velvetweed)
   sinuata Nutt. ex Ser. (wavy-leaf gaura)
   suffulta subsp. nealleyi (Coult.) Raven & Gregory (neally gaura)
   suffulta subsp. suffulta (roadside gaura, wild honeysuckle, bee blossom, kisses)
   triangulata Buckl. (prairie beeblossom)
   villosa subsp. parksii (Munz) Raven & Gregory (parks gaura)
   villosa subsp. villosa (sand gaura, hairy gaura)

 Ludwigia
   alternifolia L. (rattlebox, bushy seedbox)
   decurrens Walt. (primrose-willow)
   glandulosa subsp. brachycarpa (Torr. & Gray) Peng (torrey seedbox, creeping seedbox, cylindric-fruited ludwigia)
   glandulosa subsp. glandulosa
   grandiflora (M. Micheli) Greuter & Burdet (large flower primrose willow)
   hirtella Raf. (spindle-root, hairy ludwigia)
   leptocarpa (Nutt.) Hara (shrubby water primrose, verdolaga de agua)
   linearis Walt. (narrow leaf primrose willow)
   microcarpa Michx. (small fruit primrose willow)
   octovalvis subsp. octovalvis
   palustris (L.) Ell. (marsh primrose willow)
   peploides subsp. glabrescens (Kuntze) Raven
   peploides subsp. peploides
   peruviana (L.) Hara (peruvian primrose willow)
   pilosa Walt. (hairy seedbox)
   repens J.R. Forst. (roundleaf seedbox, floating or creeping primrose-wilow, water primrose)
   sphaerocarpa Ell. (globe fruit primrose willow)

 Oenothera
   albicaulis Pursh (pale evening primrose, prairie evening primrose)
   biennis L. (king's cureall)
   brachycarpa Gray (wright's evening primrose, shortpod evening primrose)
   caespitosa subsp. marginata (Nutt. ex Hook. & Arn.) Munz
   canescens Torr. & Frém. (beakpod evening primrose, spotted primrose)
   cordata J.W. Loudon (heart leaf evening primrose)
   coryi W.L. Wagner (el paso evening primrose)
   drummondii Hook. (beach evening primrose)
   elata subsp. hirsutissima (Gray ex S. Wats.) W. Dietr.
   engelmannii (Small) Munz (engelmann evening primrose)
   falfurriae W. Dietr. & W.L. Wagner (royal evening primrose)
   flava subsp. flava
   grandis (Britton) Smyth (showy evening primrose)
   havardii S. Wats. (harvard evening primrose)
   heterophylla subsp. heterophylla (varileaf evening primrose)
   jamesii Torr. & Gray (trumpet evening primrose)
   kunthiana (Spach) Munz (kunth sundrops)
   laciniata Hill (downy evening primrose, cutleaf evening primrose, sinuateleaf evening primrose)
   linifolia Nutt. (threadleaf sundrops)
   macrocarpa subsp. incana (Gray) Wagner (missouri primrose)
   macrocarpa subsp. macrocarpa
   macrocarpa subsp. oklahomensis (J.B.S. Norton) Wagner (ozark sundrops, glade-lily)
   mexicana Spach (mexican evening primrose)
   pallida subsp. runcinata (Engelm.) Munz & W. Klein (mountain evening primrose)
   pilosella subsp. sessilis (Pennell) Straley
   primiveris subsp. primiveris (large yellow desert primrose, desert evening primrose)
   rhombipetala Nutt. ex Torr. & Gray (four-point evening primrose)
   rosea L'Hér. ex Ait. (rose sundrop)
   spachiana Torr. & Gray (spach evening primrose)
   speciosa Nutt. (mexican evening primrose, mexican primrose, showy sundrops, showy primrose, white evening primrose, amapola del campo)
   tetraptera Cav. (fourwing evening primrose)
   texensis Raven & Parnell (texas evening primrose)
   triloba Nutt. (stemless evening primrose, three-lobbed primrose)
   villosa subsp. villosa

 Stenosiphon
   linifolius (Nutt. ex James) Heynh. (false gaura, flaxleaved stenosiphon, tall gaura)