1	"Leaves with a very short petiole 0.5-3 mm long (petiole may only be clearly visible when the leaf is removed from the stem); upper surface of lamina usually fairly flat, the margins often narrowly recurved; flowers 1 per bract; stamens sessile or subsessile; style base with sessile glands or glandular hairs"	2
1	"Leaves sessile, with strongly recurved to revolute margins; flowers mostly 3 per bract; stamens with a short filament 0.3-0.5 mm long; style glabrous, not glandular"	3
2	"Leaves with a white indumentum on undersurface; inflorescence with a white indumentum and yellow corollas; calyx lobes much shorter than tube; corolla tube 4-7 mm long; lobes 4, with small simple glandular hairs inside towards the base"	"Physopsis spicata"
2	"Leaves with a yellow indumentum on undersurface; inflorescence with both the indumentum and corollas yellow; calyx lobes slightly shorter than tube; corolla tube c. 2 mm long; lobes (4)5, with long simple non-glandular hairs inside towards base"	"Physopsis chrysophylla"
3	"Leaves mostly opposite, narrowly ovate to ovate or elliptic; corolla tube hairy inside towards the base; lobes 4"	"Physopsis lachnostachya"
3	"Leaves mostly in whorls of 3, more or less linear; corolla tube hairy inside throughout; lobes (4)5"	4
4	"Stems, leaves and flowers with a bright yellow indumentum; calyx indumentum 0.4-0.5 mm long"	"Physopsis chrysotricha"
4	"Stems, leaves and flowers with a white or off-white indumentum; calyx indumentum 0.7-1.2 mm long"	"Physopsis viscida"