A monographic study of Helichrysum subgenus Ozothamnus (Compositae) and of two related genera formerly included therein

Abstract

The species included under Helichrysum sect. Ozothamnus in Bentham's "Flora Australiensis", vol. 3 (1867), are considered and the status of the section changed to that of subgenus. Two species are reinstated in the monotypic genera Acanthocladium and Argyroglottis and the remainder retained in Helichrysum subgenus Ozothamnus and grouped into two sections which also include the more recently described species. All species are fully described.

Section Hebelaena, in which the plants are weakly woody perennials growing seasonally from the butt and bearing the capitula in open inflorescences, includes seven species.

Section Ozothamnus includes woody species of corymbose or columnar habit of branching and bearing the capitula in dense corymbose inflorescences terminal to the seasonal growth. The section includes 36 species, of which three are new. Two varieties are raised to specific status and a number of taxa treated at the subspecific level.