F. apetala
- Tube color : rose to light orange-red, at times with a dark purple, nitid ring at the rim
- Sepal color : rose red and usually dull yellow-green distally
- Corolla color :
- Flower :
- Habitus : upright
- Parentage : X
F. corymbiflora
- Tube color : pale pink to bright scarlet
- Sepal color : pale pink to bright scarlet
- Corolla color : darker than sepals, red
- Flower : single
- Habitus : upright
- Parentage : X
F. decussata
- Tube color : red to dark red
- Sepal color : red with dull green tips in bud
- Corolla color : scarlet to orange red
- Flower : single
- Habitus : upright
- Parentage : X
F. denticulata
- Tube color : waxy light pink, lavender, or light red
- Sepal color : pink to light red with light green to whitish tips or margins, at times entirely whitish green
- Corolla color : orange to scarlet, usually drying purple streaked
- Flower : single
- Habitus : upright
- Parentage : X
F. ovalis
- Tube color : red
- Sepal color : red
- Corolla color : red
- Flower :
- Habitus :
- Parentage : X
F. simplicicaulis
- Tube color : light reddish pink
- Sepal color : light reddish pink
- Corolla color : red
- Flower : single
- Habitus : upright
- Parentage : X