Citation: Benth., in Endl., Enum. Pl. Hügel 28 (1837).

Derivation: Greek isos, equal; tropis, keel; the keel is about as long as the wings.

Synonymy: Not Applicable

Common name: None

Description:
Subshrubs or herbs with erect or spreading pubescent to woolly tomentose branches; leaves alternate, simple or unifoliolate, herbaceous, pubescent, rarely glabrous; stipules linear-falcate or minute.

Flowers solitary, axillary or in loose terminal racemes, orange-yellow and/or purple; bracts and bracteoles narrow-lanceolate to linear; calyx very deeply lobed, the upper 2 lobes united almost to the top; petals clawed, striate; standard orbicular, notched, longest; wings obovate, falcate; keel incurved, nearly equalling the wings; stamens 10, free; ovary sessile, pubescent, style filiform, incurved, with a minute terminal stigma, many-ovulate.

Pod oblong-linear to lanceolate, acute, usually turgid; seed reniform, with a reticulate surface, exarillate.

Distribution:  Endemic to Australia, with some 13 species.

Biology: No text

Key to Species:

1. Leaves narrow-linear, channelled to grooved above	I. wheeleri 3.
1. Leaves ovate or obovate to orbicular
2. Leaves lamina 8-28 mm long, on petioles 5-10 mm long	I. atropurpurea 1.
2. Leaves lamina less than 10 mm long, on petioles to 1 mm long	I. centralis 2.

Author: Not yet available