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Prionium
''Prionium serratum'', the palmiet, is a robust, evergreen, semiaquatic, rhizomatous flowering plant growing to in height. It is the only species in the genus ''Prionium'', and is endemic to South Africa (Cape Province and KwaZulu-Natal).〔(Kew World Checklist of Selected Plant Families )〕 Some authors have separated ''Prionium'' from the Thurniaceae, putting it instead in its own family, the Prioniaceae.〔Munro, S. L., J. Kirschner & H. P. Linder. 2001. Prioniaceae. Species Plantarum: Flora of the World 5: 1–7.〕
==Description==
The stem of ''P. serratum'' is up to in diameter and covered with the black, fibrous bases of old spirally arranged leaves, four-ranked or tristichous, as in the closely related family Juncaceae, a family in which it was previously placed - it also has close affinities with the bergpalmiet (''Tetraria thermalis'') in the Cyperaceae. The strap-like lanceolate leaves are rigid, with a high silica content, narrow, leathery, grey-green, and with toothed margins. The small, brown flowers are on a branched inflorescence about 1 m in length. Plants are hermaphroditic and pollination is anemophilous. The fruit is a dry dehiscent triangular capsule, with three seed chambers and arillate seeds which are hispid (with sclerenchymatous fibres) and winged.〔(''"The families of flowering plants"'' - L. Watson and M. J. Dallwitz )〕〔(Missouri Botanical Garden Research Page )〕 The black fibrous, reticulate leaf bases are often found on beaches near rivers with colonies of palmiet. (see illustrations)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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