Oilbract conebush (Leucadendron microcephalum)
Description
Leucadendron microcephalum Gand. & Schinz is a dioecious, single-stemmed, South African shrub belonging to the family Proteaceae, endemic to the Western Cape and growing from sea-level to 1200m. It is one of some 200 species in the genus, all confined to South Africa. Commonly known as the 'Oilbract Conebush' because of the brown, sticky, oily bracts found on both sexes when in bud, a feature setting it apart from other Leucadendron species. After flowering the bracts close, becoming hard and dry, forming a durable cone and protecting the enclosed flowerhead and heart-shaped fruits. This species produces hairless leaves some 90mm long, and bears beetle-pollinated yellow flowers in July and August - male (about 18mm diameter) and female (about 11mm diameter) being on separate plants. Male shrubs are rounded and up to 1.5m tall, while females are narrow-crowned and up to 2m tall. Involucral leaves are yellow. The plants are killed by intense seasonal fires, but seeds retained in flower heads or woody capitula may survive for a number of years to produce the next generation. This is a highly gregarious species and is found in dense stands of hundreds of thousands of individuals, usually on mountainsides on stony sandstone soils, and particularly numerous in the vicinity of Villiersdorp. Its distribution covers Kogelberg, Kleinmond, Klein River, the Groenland Mountains north of Grabouw, Hottentots-Holland, Du Toit's Kloof Mountains, Riviersonderend Mountains and the Swartberg above Caledon. Leucadendron microcephalum was first described by Michel Gandoger & Hans Schinz in Bull. Soc. Bot. France 60: 52. 1913. Phillips mistakenly published it as a new species, L. stokoei, in "Flowering Plants of South Africa" vol. 1 in 1921.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum:
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Class: Magnoliopsida
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Order: Proteales
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Family: Proteaceae
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Genus: Leucadendron
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