1	"Flowers in extended racemes"	Helixanthera
1	"Flowers in umbels, heads, or clusters"	2
2	"Lower part of petals, and corolla tube if present, with strong, paired folds inside; secondary haustoria present on extensiv surface runners"	Plicosepalus
2	"Petals without marked folds inside; plants with a single haustorial attachment"	3
3	"Hairs simple, irregularly branched, or lacking"	4
3	"Hairs stellate or dendritic with whorls of branches"	7
4	"Corollas 6-9 cm long; radially symmetric with 4 reflexing lobes; the long stamen remaining weakley attached to the style by connective-appendages"	"Emelianthe {Emelianthe panganensis}"
4	"Corollas smaller, opening with an explosive release of pollen, bilaterally symmetric with a V-split down one side; filaments short, inflexed or inrolled"	5
5	"Corolla lobes much shorter than the tube"	Agelanthus
5	"Corolla lobes longer than the tube"	6
6	"Corolla lobes 5, the tube rounded in cross-section; calyx tubular in species of Somaliland and Somalia"	Oncocalyx
6	"Corolla lobes 4, the tube 4-angled; calyx saucer-shaped"	"Englerina {Englerina ramulosa}"
7	"Corollas opening radially, the lobes spreading"	Erianthemum
7	"Corollas with a short V-slit at anthesis, the lobes erect"	"Phragmanthera {Phragmantherus dschallensis}"