Senecio gregorii, commonly known as annual yellowtop or fleshy groundsel, is a native Australian wildflower species, found in arid and semi-arid regions of the Australia and across the globe.

It often grows prolifically after autumn/winter rains, showcasing stunning yellow flowers and fleshy foliage.

[5] It is found growing in a variety of soil types, ranging from white-grey clay to red sand, and has highly versatile habitat types, including clay pans, rocky outcrops and sand dunes[6] Using the IUCN Red List categories, S. gregorii has been classified as of "Least Concern" in Queensland and the Northern Territory.

[10] Native bees (family: Halictidae) are key pollinators of S. gregorii plants, allowing both species to persist in their habitats.

[11] Some foraging vertebrate and invertebrate animal species rely on S. gregorii as a food source.

For example, caterpillars of the moth Heliothis punctifera consume S. gregorii flowerheads before completing their development.