A taxonomic revision of Callitriche L. (Callitrichaceae) in Australia

Abstract

A morphological taxonomic study of Callitriche L. occurring in Australia (excluding island territories) has resulted in a reduction in the number of accepted indigenous species, with two species being reduced to synonymy (C. cyclocarpa Hegelm. under C. umbonata Hegelm.; C. capricorni R. Mason under C. sonderi Hegelm.). The name Callitriche hamulata has been misapplied in Australia for C. brutia Petagna var. brutia. Lectotypes are chosen for Callitriche brachycarpa Hegelm., C umbonata Hegelm. and C. muelleri Sond. Callitriche deflexa A. Braun ex Hegelm. is a recent naturalisation for Australia. All names used for Australian Callitriche have been accounted for. A key is provided for the identification of Callitriche species occurring in Australia.