Taxonomy
- Kingdom: Plantae
- Clade: Tracheophytes → Angiosperms → Eudicots → Rosids
- Order: Proteales
- Family: Proteaceae
- Genus: Grevillea
- Species: Grevillea mucronulata R.Br.
- Authority: Described by Robert Brown in 1810 (Prodromus Florae Novae Hollandiae).
Description
Grevillea mucronulata is an evergreen shrub that typically attains a height of 0.5–3 m, occasionally developing a low, spreading habit. The plant bears narrow, linear to narrowly elliptic leaves, 10–45 mm long and 1–3 mm wide, often ending in a small sharp point (mucronate), which is reflected in the specific epithet “mucronulata.” Leaves may be simple or shallowly divided, with margins that are entire or slightly toothed.
Inflorescences are terminal or axillary racemes up to 12 cm long, comprising numerous small flowers that are greenish‑white to pale yellow. The perianth is slender, and the style protrudes, giving the flower heads a spider‑like appearance—a characteristic that has led to the common name “green spider‑flower.” Flowering occurs throughout much of the year, peaking in spring and early summer. The fruit is a woody follicle that opens to release one or two seeds.
Distribution and Habitat
Grevillea mucronulata is endemic to eastern Australia. Its range extends from southeastern Queensland through the coastal and adjacent inland regions of New South Wales, reaching as far south as the Illawarra district. The species is most commonly associated with dry sclerophyll forests, heathlands, and rocky sandstone outcrops, where it grows on sandy or well‑drained loamy soils. It is usually found at elevations from sea level to approximately 800 m.
Ecology
The nectar-rich flowers attract a variety of avian pollinators, particularly honeyeaters (family Meliphagidae), which facilitate cross‑pollination. The plant is adapted to fire‑prone environments; post‑fire regeneration occurs both from seed germination stimulated by heat or smoke and from resprouting from lignotubers in some populations.
Cultivation
Grevillea mucronulata is cultivated in Australian native plant gardens and landscape designs for its attractive foliage and bird‑friendly flowers. It prefers a sunny position, well‑drained acidic to slightly neutral soils, and is moderately drought‑tolerant once established. The species tolerates light frosts but is best protected from prolonged waterlogging. Propagation is usually achieved by seed (which may require pretreatment such as scarification or smoke water) or semi‑hardwood cuttings taken in late spring to early summer.
Uses
In horticulture, the shrub is valued for:
- Ornamental appeal in informal garden settings.
- Providing nectar for native birds and insects.
No significant commercial uses (e.g., timber, medicinal) are recorded for this species.
Conservation Status
The species is not listed as threatened on the Australian Government’s Environment Protection and Biodiversity Conservation (EPBC) Act list. Within its range, it is considered locally common, and state assessments (e.g., New South Wales Biodiversity Conservation Act) classify it as “Least Concern.”
Key References
- Australian Plant Census (APC) entry for Grevillea mucronulata.
- Brown, R. (1810). Prodromus Florae Novae Hollandiae.
- Royal Botanic Gardens, Sydney – PlantNet: Grevillea mucronulata profile.
- NSW Office of Environment and Heritage, Species Profile and Threats Database.
