Suriname stickpea

This highly branched, spreading shrub features silky bipinnate leaves. Each pair of leaflets, or pinnae, are in turn divided into about six pairs of leaflets, pinnules. The plant usually has complexly branched multiple trunks and grows to a height of about 8 meters. Left unpruned it grows long thin branches that eventually droop down onto the ground. The leaves close and droop from dusk until morning when they once again reopen. Leaves are glossy rusty in colour when new, turning to a dark metallic green as they age.

Flowers. It produces large, showy flower heads that resemble powder puffs or oversized wattle flowers that appear from winter to spring. Although the petals are small, the numerous stamens—white at the base and pink toward the tips—provide most of the colour. The flowers present as globose heads with small green petals and calyx with up to a 100 stamens more or less united into a tube. The stamens are long, hairlike, colourful and protrude well beyond the petals. C. surinamensis flowers all year round with definite more prolific periods. The flowers are short lived and sticky and combined with their quantity give this plant a reputation for making a mess especially on vehicles parked under it. The numerous colourful stamens are white towards the base and pink towards the top. It is the stamens & anthers that give the flower the appearance of a pink powder puff. …

The plant is native to northern South America in countries such as, Bolivia, Brazil North, Brazil Northeast, Brazil West-Central, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname and Venezuela.

In cultivation, Calliandra surinamensis thrives in full sun to partial shade on a range of well‑drained soils, shows high drought tolerance, and once established requires little special care beyond occasional pruning to control its size and shape. The species can be cultivated as a tall (1.5–1.8 m) flowering hedge or as a small specimen tree with lower branches removed. When pruned as a tree, it may reach up to 4.5 m (15 ft) in height, with long, arching branches forming an attractive canopy suitable for patios or container plantings. According to the University of Florida, it typically has non‑problematic surface roots, offers winter interest due to its distinctive form and persistent fruits, is not considered an outstanding tree, and shows general resistance to pests, with no entries found for invasive potential. It typically develops multiple trunks and low‑branching, drooping branches that are not particularly showy; the bark is thin and may be easily damaged, and occasional pruning is recommended to develop a strong structure. Propagation is by seed or cuttings.

Ethnobotany. The plant is said to contain lectins which are toxic to cancer cells, although more research is needed. …