1	Leaves simple, elliptic to linear; racemes contracted, to 15 mm long, the flowers tightly clustered in the leaf axil; calyx lobes longer than the tube	I. linifolia
–	Leaves imparipinnate with three to many leaflets; racemes elongated; calyx lobes shorter or equalling the tube	2
2	Leaflets alternate	I. spicata
–	Leaflets opposite	3
3	Inflorescence much shorter than the subtending leaf; pod curved and descending, deflexed against the raceme axis	I. suffruticosa
–	Inflorescence equaling or longer than the subtending leaf; pod straight, spreading or ascending	4
4	Branches, petiole, leaf rachis, inflorescences and pod covered by erect, long (c. 1 mm long) and dark hairs	I. hirsuta
–	Branches, petiole, leaf rachis and inflorescences covered with adpressed and white or brown hairs, visible only with the aid of a lens, or glabrescent	5
5	Leaflets mostly obovate or orbicular with an emarginate apex, whitish or greyish at the lower surface; petals white, sometime tinged pink; standard petal straight or slightly spreading at the anthesis	6
–	Leaflets elliptic or ovate with apex acuminate, obtuse or rounded; petals pink, red or purple; standard petal reflexed at the anthesis	7
6	Virgate shrub or subshrub, 0.5–2.5 m high; leaves usually with (5-)7–11 leaflets; leaflets mostly 4–12 mm long, venation almost invisible adaxially; leaf rachis articulated; petiolules light brown on dry specimens, of the same color as the rachis; flowers 8–10 mm long	I.monieriana sp. nov.
–	Small tree or shrub, 3–5 m high; leaves with 15–19 leaflets; leaflets mostly 27–32 mm long, secondary veins 6–7 visible on the both sides; leaf rachis not articulated; petiolules dark brown in dry specimens, presenting a different color as the rachis; flowers c. 6.5 mm long	I.dumbeana sp. nov.
7	Leaflet elliptic, apex rounded and mucronate; flowers 8–10 mm long; bracts much longer than the flower bud, persistent; seeds 6–8, circular in cross section and arranged linearly	I. atropurpurea
–	Leaflet ovate or elliptic-lanceolate, apex acuminate; flowers 4.5–6.5 mm long; bracts shorter than the flower bud, early caducous; seeds c. 16, lens-shaped, compressed in cross section, arranged like a stack of coins	I. zollingeriana