General Description:
Platylobium is a small genus of 9 species which is closely related to Bossiaea. Revision of the genus in 2011 has resulted in several forms of Platylobium formosum being separated out into new species (see footnote).
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Platylobium formosum is a straggly, understory shrub from about 1 to 2 metres high with wiry stems. The leaves vary from narrowly ovate to heart-shaped and are 30-50 mm long by 15-40 mm wide. There are conspicuous reticulate veins on the upper surface.
The bright yellow flowers have the typical “pea” shape consisting of 4 petals; the “standard”, the “keel” and two “wings”, as shown in the diagram. They occur in late spring and summer, solitary or two together in the leaf axils. They have a red centre and are relatively large – 8-15 mm long. The flowers are followed by flat seed pods about 20-40 mm long.
P.formosum is not often cultivated but is grown by Australian plant enthusiasts. It is regarded as a hardy species for moist, shady sites, similar to those of its natural habitat. It requires good drainage.
Propagation is relatively easy from seed following pre-treatment with boiling water (similar to other members of the pea family). Cuttings may also be successful from firm, current season’s growth.

Platylobium formosum
Photo: Brian Walters