Grevillea spinosissima

Grevillea spinosissima is a shrub in the family Proteaceae, characterised by rigid, spine-tipped foliage typical of many spiky-leaved grevilleas, an adaptation that likely deters herbivory in nutrient-poor Australian soils. Like other members of its genus, it produces distinctive flower clusters rich in nectar, which attract birds and insects that act as pollinators, making the species a contributor to local pollination networks. Its woody structure and persistent leaf litter also provide shelter for small fauna within its habitat.

The species is endemic to Australia, where it occurs in forest and shrubland ecosystems, typically in sclerophyll vegetation communities adapted to fire-prone, low-fertility landscapes. Its distribution is naturally patchy, consistent with many range-restricted Grevillea species that occupy specific soil types or microhabitats.

The primary threats to Grevillea spinosissima are habitat disturbance and loss linked to road and railroad infrastructure, which fragments populations and can alter local hydrology and fire regimes along corridors. Expansion of annual and perennial non-timber cropping also reduces available habitat, converting native shrubland and forest understorey into agricultural land. These pressures are ongoing rather than historical, contributing to a continuing decline in population size and habitat quality.

Conservation measures specific to this species are not well documented, though as a listed Vulnerable species under the IUCN Red List, it may benefit from broader Australian native vegetation protections, roadside reserve management, and regional biodiversity offset schemes associated with infrastructure and agricultural development approvals.

Given the ongoing nature of its threats and its restricted range, the species' population trend is currently decreasing, and its conservation outlook remains uncertain without targeted habitat protection measures.