TL;DR: Genera of tribe Chamelaucieae displayed five distinct colpal morphologies, which makes it the tribe with the most diverse pollen in Myrtaceae, and Actinodium is the only genus to have prolate-spheroidal shaped pollen.
Abstract: The pollen morphology of 36 genera and 147 species from the Myrtaceae tribes Chamelaucieae, Leptospermeae and Lindsayomyrteae was surveyed using scanning electron microscopy (SEM) and light microscopy (LM). Syncolpate pollen were observed in all genera of Leptospermeae and some genera of Chamelaucieae. Genera of tribe Chamelaucieae displayed five distinct colpal morphologies, which makes it the tribe with the most diverse pollen in Myrtaceae. Six genera of Chamelaucieae, including Actinodium, Chamelaucium, Darwinia, Homoranthus, Pileanthus and Verticordia, produce large acolpate pollen not observed in any other Myrtaceae. Two of these genera produce distinct pollen; Actinodium is the only genus to have prolate-spheroidal shaped pollen, and Pileanthus pollen is large and dicolporate. A number of anomalous aperture types occurred in species of Chamelaucieae, including monocolporate (Homoranthus thomasii), pentacolporate (Calytrix oldfieldii) and hexacolporate (Sannantha tozerensis). Pollen of Lindsayomyrteae appeared similar to those of Leptospermeae and Chamelaucieae, and on the basis of pollen features, could be related to these two tribes.
TL;DR: Five taxa are added to a previously published molecular dataset of Sannantha, a genus of shrubs widely distributed in eastern Australia and New Caledonia, with a total of 11 of the 16 species in the genus.
Abstract: Sannantha is a genus of shrubs widely distributed in eastern Australia and New Caledonia. We added five taxa to a previously published molecular dataset, four from Australia and the fifth from New Caledonia, a total of 11 of the 16 species in the genus. One of the Australian taxa added is a new species apparently restricted to the Goonoowigall State Conservation Area near Inverell, New South Wales. The results of the molecular analysis are discussed in light of morphology and geographic distribution. The new species, Sannantha whitei Peter G.Wilson, is described.
TL;DR: The validity of the generic concept of Babingtonia Lindl.
Abstract: The validity of the generic concept of Babingtonia Lindl. adopted by Bean (1997a) is tested in the light of molecular and morphological data. Molecular analyses support recognition of segregate genera, none of which is closely related to the type of the genus, Babingtonia camphorosmae, a western Australian species. Two genera, Sannantha and Kardomia, are described as new and a third genus, Harmogia, resurrected from synonymy; new combinations are provided in the new genera. A fourth group, consisting of ‘Babingtonia’ behrii and its allies, appears distinct but, as a predominantly southern group, with numerous western Australian representatives, is not treated further.