Allocasuarina lehmanniana, commonly known as dune sheoak,[2] is a species of flowering plant in the family Casuarinaceae and is endemic to near-coastal areas of the south-west of Western Australia. It is dioecious or less commonly a monoecious shrub that has its leaves reduced to scales in whorls of six to eight, the mature fruiting cones 12–35 mm (0.47–1.38 in) long containing winged seeds (samaras) 4.0–5.5 mm (0.16–0.22 in) long.
Description
Allocasuarina lehmanniana is a dioecious, or less commonly a monoecious shrub that typically grows to a height of 1.5–4 m (4 ft 11 in – 13 ft 1 in). Its branchlets are up to 120–200 mm (4.7–7.9 in) long (depending on subspecies), the leaves reduced to scale-like teeth 0.4–0.8 mm (0.016–0.031 in) long, arranged in whorls of six to eight around the branchlets. The sections of branchlet between the leaf whorls (the "articles") are mostly 5–9 mm (0.20–0.35 in) long and 0.7–1.2 mm (0.028–0.047 in) wide. Male flowers are arranged in spikes 10–30 mm (0.39–1.18 in) long, in whorls of five to eight per centimetre (per 0.39 in.), the anthers 0.6–0.9 mm (0.024–0.035 in) long. Female cones are on a peduncle 2–38 mm (0.079–1.496 in) long, the mature cones 12–35 mm (0.47–1.38 in) long and 7–12 mm (0.28–0.47 in) in diameter containing black samaras 4.0–5.5 mm (0.16–0.22 in) long.[2][3]
Allocasuarina lehmanniana subsp. ecarinata L.A.S.Johnson[8] has branchlets up to 120 mm (4.7 in) long, six or seven teeth, the mature cones 12–24 mm (0.47–0.94 in) long and 7–11 mm (0.28–0.43 in) in diameter.[9][10]
Allocasuarina lehmanniana (Miq.) L.A.S.Johnson subsp. lehmanniana[11] has branchlets up to 200 mm (7.9 in) long, seven or eight teeth, the mature cones 13–35 mm (0.51–1.38 in) long and 9–12 mm (0.35–0.47 in) in diameter.[12][13]
^ ab"Allocasuarina lehmanniana". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 14 June 2023.
^Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 237. ISBN9780958034180.