Trithuria sect. Hydatella

Trithuria sect. Hydatella is a section within the genus Trithuria native to New Zealand and Australia.

Description

The apocarpous berry fruit is indehiscent. Pericarp papillae and pericarp ribs are absent. The fruit stalk bears a distal constriction, serving as an abscission zone. The seed cuticle is thick.

Taxonomy

It was first described as Hydatella by Friedrich [Ludwig Emil Diels] in 1904. After the former genus Hydatella was merged into Trithuria in 2008, the section Trithuria sect. Hydatella was described by Dmitry Dmitrievich Sokoloff, William J. D. Iles, Paula J. Rudall, and Sean W. Graham in 2012.

Species

It has four species:

Trithuria austinensis
Trithuria australis
Trithuria filamentosa
Trithuria inconspicua
Trithuria [inconspicua subsp. brevistyla|Trithuria inconspicua subsp. brevistyla]
Etymology

The section name Hydatella comes from the former genus Hydatella, whose name is derived from the diminutive of ύδωρ meaning water.

Distribution

Its species occur in New Zealand and Australia.

Phylogeny

Trithuria sect. Hydatella split from Trithuria sect. Trithuria about 16 million years ago in the Early Miocene.