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The Western Australian Herbarium’s collections management system, WAHerb, and DBCA’s flora taxonomic names application, WACensus, have been set to read-only mode since 1 October 2025. Recent taxonomic changes are not currently being reflected in Florabase, herbarium collections, or the census. Due to the rapidly approaching holiday season and associated agency and facility soft closures, along with the substantial work involved in data mapping, cleaning, and verification, the migration to the new collection management software is not expected to occur before 1 March 2026, when a further update will be provided. Please reach out to us if you have any questions or concerns.

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Siegfriedia C.A.Gardner

Reference
J.Roy.Soc.Western Australia 19:85 (1933)
Name Status
Current

Scientific Description

Family Rhamnaceae.

Habit and leaf form. Shrubs. ‘Normal’ plants. Leaves well developed. Plants with roots; non-succulent; unarmed; autotrophic. To 1 m high. Self supporting. Not heterophyllous. Leaves small; opposite; with blades; leathery; petiolate; simple; not peltate. Leaf blades entire; flat; oblong; pinnately veined; cordate. Mature leaf blades adaxially glabrous; abaxially woolly. Leaves with stipules. Stipules scaly; caducous. Leaf blade margins entire; revolute. Leaf anatomy. Hairs present, or absent; complex hairs present, or absent. Complex hairs stellate.

Reproductive type, pollination. Fertile flowers hermaphrodite. Unisexual flowers absent. Plants hermaphrodite.

Inflorescence and flower features. Flowers aggregated in ‘inflorescences’. Inflorescence many-flowered. Flowers in cymes (and pseudo-heads). Inflorescences compound. The terminal inflorescence unit cymose. Inflorescences terminal; pendent; with involucral bracts. Involucral bracts prominent. Flowers long pedicellate; bracteate; minute, or small; regular; 5 merous; cyclic; tricyclic. Free hypanthium present. Perianth sepaline; 5; 1 -whorled. Calyx present; 5, or 4 (rarely); 1 -whorled; gamosepalous; lobed; glabrous; valvate; regular. Calyx lobes ovate. Epicalyx absent. Corolla absent. Androecium present. Fertile stamens present. Androecial members definite in number. Androecium 5, or 4 (rarely). Androecial members adnate (to the floral tube); free of the gynoecium; free of one another; 1 -whorled. Stamens 5, or 4 (rarely); all more or less similar in shape; isomerous with the perianth; alternisepalous; filantherous. Anthers separate from one another; dehiscing via longitudinal slits; bilocular; tetrasporangiate. Fertile gynoecium present. Gynoecium 3 carpelled. The pistil 1 celled. Carpels reduced in number relative to the perianth. Gynoecium syncarpous; synstylovarious; inferior. Ovary plurilocular; 3 locular. Gynoecium stylate. Styles 1; apical. Stigmas 3 - lobed. Ovules 1 per locule (in WA); ascending; anatropous.

Fruit and seed features. Fruit aerial; a schizocarp. Dispersal unit the seed, or the fruit. Seeds 1 per locule.

Geography, cytology, number of species. Native of Australia. Endemic to Australia. Australian states and territories: Western Australia. South-West Botanical Province. A genus of 1 species; 1 species in Western Australia; 1 endemic to Western Australia.

Etymology. After Siegfried, a German mythical hero who possessed a magical cloak which rendered him invisible; the flower heads are hidden among large involucre-like bracts.