Gompholobium scabrum – Rough Gompholobium ("painted lady")
Gompholobium scabrum, rough gompholobium, is a striking shrub from the pea family (Fabaceae), endemic to southwestern Australia, known as the "painted lady." It is famous for its large, butterfly-shaped flowers in pink-purple, "painted" colors with darker markings and delicate, needle-like foliage.
Synonyms and nomenclature
The species was described by J.E. Smith (1808). The Kew POWO database lists two synonyms for it (the genus Burtonia has been merged into Gompholobium):
- Burtonia scabra (Sm.) R.Br. (homotypic synonym)
- Burtonia pulchella Meisn.
In English, the plant is called "painted lady" and "dainty wedge-pea" (the entire Gompholobium genus is sometimes called "wedge-peas" or "glory peas"); the Polish name is gomfolobium szorstkie. The epithet scabrum means "rough" and refers to the stems.
Origin and appearance
The species is endemic to southwestern Australia, where it grows on undulating plains in regions such as Avon Wheatbelt, Esperance Plains, Jarrah Forest, Mallee, and Swan Coastal Plain. It is an erect to spreading shrub 0.4–2.3 m tall, with smooth, hairless stems.
The leaves are small, narrow, and needle-like, with rolled-under edges, arranged in whorls around the stem (somewhat resembling rosemary). The flowers are large (about 2.5 cm), butterfly-shaped, ranging from pink to purple, with darker markings that give them a "painted" effect and explain the English name. It blooms from August to November (early spring in Australia). The fruit is an inflated, cylindrical pod with hard seeds.
Frost resistance and cultivation
This is a heat-loving and frost-sensitive plant, adapted to the Mediterranean-subtropical climate of western Australia; we consider hardiness zone 9 (practically 9–10). It is not suitable for zones with severe frost without protection. It requires full sun and sharply drained, sandy-gravelly soil that must never be waterlogged. As an Australian species, it is sensitive to phosphorus – typical high-phosphorus fertilizers should be avoided. In temperate climates, it is grown in pots and protected from frost.
Cultivation from seeds
The seeds have a hard, impermeable coat (physical dormancy), typical of Australian peas. Before sowing, it must be broken: the standard method is to pour boiling water over the seeds and soak them overnight (sow those that have swollen) or scarify them (cutting, rubbing with sandpaper). Germination is also aided by smoke treatment (smoke water), typical for species adapted to fires. Sowing is shallow (about 6 mm), at a temperature of 18–24°C; seedlings appear within 14–45 days. Untreated seeds germinate poorly and unevenly.
Care and use
The plant requires full sun, sharp drainage, and low-phosphorus or no fertilization; it is drought-resistant and does not tolerate "wet feet." Australian pea seedlings do not transplant well – it is best to grow them directly in their final pots. This is an ornamental Australian shrub with spectacular spring flowering, and as a legume, it fixes atmospheric nitrogen, enriching the soil.
Interesting facts
The plant was long known as Burtonia scabra – the entire genus Burtonia was later merged into Gompholobium, so both former names are now synonyms for the same species. Its hard, long-lived seeds are adapted to germinate after fire, so cultivation requires mimicking this stimulus with hot water, scarification, or smoke.
Summary
Gompholobium scabrum is a plant for lovers of Australian flora and unusual, "painted" pea flowers. Cultivation from seeds is moderately demanding – breaking the hard seed coat is key – but in return, you get an impressive, drought-tolerant shrub that enriches the soil.
