Upper leaf surface shiny, flowers 8-12 cm long, calyx >20 mm long, corolla tube not ridged, fruit 5.5-10 cm long
Upper leaf surface not shiny, flowers <10 cm long, calyx <25 mm, corolla tube ridged, fruit < 5.5 cm long
Lower surface of mature leaves with unbranched glandular hairs; leaves sticky to touch; flowers <5 cm long
Lower surface of mature leaves covered with branched (stellate) hairs; leaves not sticky to touch (note immature and early spring leaves may be sticky); flowers >5 cm long
Stellate hairs on lower surface of mature leaves distinctly stalked
Stellate hairs on underside of leaves either sessile or shortly stalked
Inflorescence cylindrical with a few long branches near the base, upper flower clusters sessile or occasionally very shortly pedunculate
Inflorescence pyramidal with short branches, upper flower clusters clearly pedunculate
Flowers <8 cm long, capsules ellipsoid, leaves ca 2x as long as wide
Flowers 8-10 cm long, capsules ovoid, length of leaves <1.5 x width