Allocasuarina humilis
species of plant
Allocasuarina humilis, commonly known as dwarf sheoak, is a species of flowering plant in the family Casuarinaceae and is endemic to the south-west of Western Australia. It is an erect or spreading dioecious or monoecious shrub that has its leaves reduced to scales in whorls of five to seven, the mature fruiting cones 12–22 mm (0.47–0.87 in) long containing winged seeds (samaras) 5–6 mm (0.20–0.24 in) long.
Description
Allocasuarina humilis is an erect or spreading, dioecious or monoecious shrub that typically grows to a height of 0.2–2 m (7.9 in – 6 ft 6.7 in). Its needle-like branchlets are more or less erect, up to 120 mm (4.7 in) long, the leaves reduced to scale-like teeth 0.4–0.5 mm (0.016–0.020 in) long, arranged in whorls of five to seven around the branchlets. The branchlets are smooth and sometimes waxy. The sections of branchlet between the leaf whorls (the "articles") are mostly 3–6 mm (0.12–0.24 in) long and 0.8–1.2 mm (0.031–0.047 in) wide. Male flowers are arranged in spikes 6–18 mm (0.24–0.71 in) long, in whorls of 12 to 16 per centimetre (per 0.39 in.), the anthers 0.7–0.8 mm (0.028–0.031 in) long. Flowering occurs from May to November, and the mature cones are sessile, 12–22 mm (0.47–0.87 in) long and 10–17 mm (0.39–0.67 in) in diameter containing samaras 5–6 mm (0.20–0.24 in) long with a short wing.
Taxonomy
This sheoak was first formally described in 1841 by Christoph Friedrich Otto and Albert Gottfried Dietrich, who gave it the name Casuarina humilis in their book Allgemeine Gartenzeitung. In 1982, Lawrie Johnson transferred it to the new genus Allocasuarina as A. humilis in the Journal of the Adelaide Botanic Gardens.
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This entry incorporates text from “Allocasuarina humilis” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.