Calylophus is a genus of flowering plants in the family Onagraceae.

Species include:

• Calylophus berlandieri Spach (Berlandier's sundrops)
• Calylophus hartwegii (Benth.) Raven (Hartweg's sundrops)
• Calylophus lavandulifolius (Torr. & Gray) Raven (lavenderleaf eveningprimrose)
• Calylophus serrulatus (Nutt.) Raven (halfshrub sundrop)
• Calylophus toumeyi (Small) Towner (Toumey's sundrops)
• Calylophus tubicula (Gray) Raven (Texas sundrops)

References

• ITIS standard report page: Calyophus