Nuytsia
The journal of the Western Australian Herbarium

This paper advances knowledge of triggerplant diversity in monsoonal and arid Australia. The following 14 species are newly described: Stylidium aliforme Wege & Brennan (N.T.), S. anomalum Wege (W.A.), S. brachyotis Wege & Brennan (N.T.), S. brennanianum Wege, M.D.Barrett & A.R.Bean (W.A., N.T., Qld), S. contrarium Wege (N.T.), S. eludens Wege & A.R.Bean (Qld), S. incognitum Wege (W.A., N.T.), S. modicum M.D.Barrett, R.L.Barrett & Wege (W.A.), S. pezidium Wege, Brennan & S.J.Dillon (W.A., N.T., Qld), S. synaptum Wege, Brennan & A.R.Bean (W.A., N.T., Qld), S. tantillum Wege & Brennan (N.T.), S. torquatum Wege & Brennan (N.T.), S. tremendum Wege, M.D.Barrett & R.L.Barrett (W.A.) and S. youwanjela M.D.Barrett, R.L.Barrett & Wege (W.A.). Stylidium tenerrimum F.Muell. (W.A., N.T.) is recircumscribed and S. evolutum Carlquist (N.T.) reinstated to its original circumscription. Narrower circumscriptions of S. fissilobum F.Muell. (W.A., N.T.) and S. multiscapum O.Schwarz (W.A., N.T.) are presented and a lectotype designated for the latter. Stylidium tenerum Spreng. (N.T., Qld, P.N.G.) is placed into synonymy under S. uliginosum Sw. ex Willd. (south-east Asia), and S. symonii Carlquist (N.T.) synonymised under S. floodii F.Muell. (N.T., Qld). Stylidium elachophyllum A.R.Bean & M.T.Mathieson (Qld) and S. irriguum W.Fitzg. (W.A.) are recorded for the Northern Territory, while S. aquaticum A.R.Bean (N.T.) and S. capillare R.Br. (N.T., Qld) are recorded for Western Australia. A record of S. longibracteatum (W.A.) from Kata Tjuta in the Northern Territory is highlighted as having potentially unreliable locality information. Lectotypes are selected for S. claytonioides W.Fitzg., S. cordifolium W.Fitzg., S. irriguum W.Fitzg., S. rubriscapum W.Fitzg. and S. trichopodum F.Muell. Both S. pseudotenellum O.Schwartz and S. mitrasacmoides F.Muell. are treated as names of uncertain application. The existence of appropriated type fragments in Herbarium Lowrieanum, recently bequeathed to the Western Australian Herbarium, is noted.

An annotated dichotomous key and photographic guide to Stylidium Sw. ex Willd. in the Northern Territory is provided. Stylidium gemmatum Wege & Brennan is formally described, and S. stenophyllum A.R.Bean placed into synonymy under a broadly circumscribed S. pachyrrhizum F.Muell.