Polianthion, a new genus of Rhamnaceae (Pomaderreae) from Western Australia and Queensland

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Contents Vol 19(2)

doi:10.1071/SB05027

Polianthion, a new genus of Rhamnaceae (Pomaderreae) from Western Australia and Queensland

Jürgen Kellermann ^A ^B ^E, Barbara L. Rye ^C, Kevin R. Thiele ^D

^A National Herbarium of Victoria, Royal Botanic Gardens Melbourne, Birdwood Avenue, South Yarra, Vic. 3141, Australia.
^B School of Botany, The University of Melbourne, Vic. 3010, Australia.
^C Western Australian Herbarium, Department of Conservation and Land Management, Locked Bag 104, Bentley Delivery Centre, WA 6983, Australia.
^D Australian National Herbarium, Centre for Plant Biodiversity Research, GPO Box 1600, Canberra, ACT 2601, Australia.
^E Corresponding author. Email: juergen.kellermann@rbg.vic.gov.au





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Australian Systematic Botany 19(2) 169–181 http://dx.doi.org/10.1071/SB05027
Submitted: 16 September 2005 Accepted: 2 February 2006 Published online: 28 April 2006

Abstract

Recent phylogenetic studies have revealed that four species of Australian Rhamnaceae, tribe Pomaderreae Reissek ex Endl., should be assigned to a new genus. This paper describes Polianthion K.R.Thiele, including one new species, P. collinum Rye, and makes the relevant combinations for P. bilocularis (A.S.George) Kellermann, P. wichurae (Nees ex Reissek) K.R.Thiele and P. minutiflorum (E.M.Ross) K.R.Thiele. The genus is defined by having two carpels, a characteristic dense stellate indumentum on both vegetative and floral parts of the plant, free stipules, long-pedicellate flowers and fruitlets dehiscent for their full length. Three species are found in the south-west of Western Australia and one in eastern Queensland.