Stylidium subg. Centridium
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''Stylidium'' subg. ''Centridium'' is a subgenus of ''Stylidium'' that is characterized by a globose hypanthium, a stipitate brush-like stigma, and gynostemium mobility not produced by a sensitive hinged torosus but by the movement of a cunabulum. All species with the possible and doubtful exception of ''S. weeliwolli'' are annuals.〔Lowrie, A. and Kenneally, K.F. (1998). Three new triggerplant species in ''Stylidium'' subgenus ''Centridium'' (Stylidiaceae) from Western Australia. ''Nuytsia'', 12(2): 197-206.〕 This subgenus appears to be most closely related to the genus ''Levenhookia'', which suggests an ancestral relationship.〔Carlquist, S. (1969). Studies in Stylidiaceae: New taxa, field observations, evolutionary tendencies. ''Aliso'', 7(1): 13-64.〕 ''Centridium'' was first published by John Lindley in the 1839 publication, ''A Sketch of the Vegetation of the Swan River Colony''. Lindley created this subgenus to distinguish species which did not fit into either of the two other subgenera that had existed at the time. He initially placed ''Stylidium calcaratum'', the newly described ''Stylidium androsaceum'', and ''Stylidium stipitatum'' into subgenus ''Centridium''. His description of ''S. androsaceum'' turned out to be synonymous with ''S. calcaratum'' and ''S. stipitatum'' is a synonym of ''Levenhookia stipitata''.
* List of ''Stylidium'' species
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