Paula J. Rudall

Boryaceae is a family of highly drought-tolerant flowering plants native to Australia, placed in the order Asparagales of the monocots. The family includes two genera, with twelve species in total in Australia. Until recently, this family was not recognized by many taxonomists; most systems put the two genera, Borya and Alania, in the Anthericaceae or the Liliaceae. The 2016 APG IV system (unchanged from the 1998, 2003 and 2009 versions) does recognize this family and places it in the order Asparagales, in the clade monocots, based on molecular phylogenetic evidence that shows the two genera

Xeronema is a genus of flowering plants containing two species, Xeronema moorei from New Caledonia, and Xeronema callistemon (the Poor Knights lily) from the Poor Knights Islands and Taranga Island in New Zealand. The plants are herbaceous monocots, spreading by rhizomes, and have large flowers set on terminal spikes, with stamens towering above the flowers. The type species X. moorei is found in the mountains of New Caledonia. The Poor Knights lily (X. callistemon) is endemic to the Poor Knights Islands and Taranga Island in the north of New Zealand. It was discovered in 1924. The Poor

Trithuria australis is a species of aquatic plant in the family Hydatellaceae endemic to Western Australia.

Trithuria austinensis is a species of aquatic plant in the family Hydatellaceae endemic to Western Australia.

Agavoideae is a subfamily of monocot flowering plants in the family Asparagaceae, order Asparagales. It has previously been treated as a separate family, Agavaceae, and by 2020, several sources had restored the taxonomic status of Agavaceae as an independent family. The group includes many well-known desert and dry-zone types, such as the agaves and yuccas (including the Joshua tree). About 640 species are placed in around 23 genera; they are widespread in the tropical, subtropical, and warm temperate regions of the world.

Trithuria polybracteata is a species of plant in the family Hydatellaceae endemic to Western Australia.

Trithuria cowieana is a species of aquatic plant in the family Hydatellaceae endemic to the Northern Territory, Australia.

Trithuria cookeana is a species of aquatic plant in the family Hydatellaceae endemic to the Northern Territory, Australia.

Trithuria fitzgeraldii is a species of aquatic plant in the family Hydatellaceae endemic to Western Australia.