Key to Linaceae genera in Mexico

1. Petals with reddish venation, presence of basal adaxial appendages; carpels, styles, and stigmata 2 or 3; fruit dehiscent into 4 or 6 segments ........................................................................................................................................................................ Hesperolinon

- Petals without reddish venation, absence of basal daxial appendages; carpels, styles, and stigmata 5; fruit dehiscent into 5 or 10 segments .................................................................................................................................................................................... Linum