Eucalyptus peninsularis, commonly known as Cummins mallee,[1] is a species of mallee that is endemic to a small area of South Australia. It has smooth, greyish or brownish bark, lance-shaped adult leaves, flower buds in groups of between seven and eleven, pale creamy yellow flowers and urn-shaped fruit.
Eucalyptus peninsularis is a mallee that typically grows to a height of and forms a lignotuber. It has smooth, greyish to brownish bark that is shed in ribbons. Young plants and coppice regrowth have sessile, dull green, elliptical to egg-shaped leaves arranged in opposite pairs. Adult leaves are arranged alternately, the same shade of glossy green on both sides, lance-shaped, long and wide, tapering to a petiole long. The flower buds are arranged in leaf axils in groups of seven, nine or eleven on an unbranched peduncle long, the individual buds on pedicels long. Mature buds are long and wide, have a ribbed, urn-shaped floral cup and a beaked to horn-shaped operculum. Flowering has been recorded in December and the flowers are pale creamy yellow. The fruit is a woody, urn-shaped capsule long and wide with the valves sometimes enclosed in the fruit, sometimes protruding strongly.[2] [3]
Eucalyptus peninsularis was first formally described in 1997 by Dean Nicolle in his book, Eucalypts of South Australia. The type material was collected north-west of Cummins on the road to Mount Hope in 1972.[4] The specific epithet (peninsularis) is from the Latin word peninsula, meaning "a narrow body of land", referring to the distribution on the Eyre Peninsula.
Cummins mallee is restricted to south-central parts of the Eyre Peninsula, especially near the Cummins and Yeelanna areas where it grows in open mallee or woodland.
Eucalyptus peninsularis occurs in a mallee community complex, often with E. dumosa or E. calycogona. That complex has been rated as "poorly conserved in South Australia". Only small parts of that ecosystem have been conserved, including in Hambidge Wilderness Protection Area, the Verran Tanks Conservation Park and the Wharminda Conservation Park.The total area occupied by E.peninsularis prior to colonisation was but has now been reduced to and the population is now severely fragmented. The International Union for the Conservation of Nature listed it as a vulnerable species in 2019.