Taxonomic notes on Boronia species of north-western Australia, including a revision of the Boronia lanuginosa group (Boronia section Valvatae : Rutaceae)
The revision of Boronia (Rutaceae) in the Northern Territory, the Kimberley Region of Western Australia, and north-western Queensland is completed, and a key to all species is provided. The B. lanuginosa Endl. species group is characterized as those species with pinnate leaves, a calyx as large as or larger than the corolla, multiangular stellate hairs, and a pronounced ridge on the micropylar side of the seed. This clade comprises the B. lanuginosa species complex, B. filicifolia A. Cunn. ex Benth., B. pauciflora W. Fitzg. and five newly described species: viz. B. decumbens Duretto, B. minutipinna Duretto, B. kalumburuensis Duretto, B. jucunda Duretto and B. tolerans Duretto. The B. lanuginosa species complex has four available names and was analysed numerically using phenetic methods. Two taxa were identified in the analysis. Boronia artemisiifolia var. wilsonii F. Muell. ex Benth. is raised to specific status while B. affinis R. Br. ex Benth. and B. artemisiifolia F. Muell. are synonymized under B. lanuginosa . Additionally, B. rupicola Duretto is described, and B. filicifolia, B. lanceolata F. Muell. , B. lanuginosa and B. pauciflora are lectotypified.