Crotalaria laburnifolia L.
Linnaeus, C. von (1753) Species Plantarum 2: 715. Type: Habitat in Asia.
Bird Flower; Rattlepod
Flowers and fruits as a shrub about 1-2 m tall.
Inflorescences about 3-33 cm long. Flowers borne singly in the axils of persistent narrow, about 4 mm long, bracts. Calyx about 12-17 mm long, the lobes longer than the tube. Petals: standard yellow, often marked with red-brown lines; wings about 10-20 mm long; keel about 20-30 mm long. Stamens 10, dimorphic, five with dorsifixed anthers and five with basifixed anthers. Pollen orange. Staminal filaments fused to form a tube which is open on one side. Ovary stalked, ovules about 20-22. Style hairy towards the apex, stigma hairy.
Cotyledons about 17-22 x 11-15 mm, petiole short, about 1 mm long. First pair of leaves trifoliolate. At the tenth leaf stage: leaflet blades elliptic to ovate, about 35-40 x 20-25 mm, leaflet stalks short, about 1-2 mm long. Lateral veins about 7 or 8 pairs, forming loops inside the blade margins. Seed germination time 5 to 7 days.
This species has been suspected of causing walkabout disease in horses but it is now believed that this species is not toxic to stock; not toxic to rats in laboratory tests. Hacker (1990).