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Acidonia L.A.S.Johnson & B.G.Briggs, Bot. J. Linn. Soc. 70: 175 (1975); from the Greek akis , akidos (a point), alluding to the connective appendage, and the ending -onia to suggest affinity with Persoonia

Type: Acidonia microcarpa (R.Br.) L.A.S.Johnson & B.G.Briggs

Shrubs. Leaves alternate, sessile. Inflorescence lateral, abbreviated, anauxotelic. Flowers subtended by scale leaves. Perianth actinomorphic; tepals free. Stamens all fertile; filaments adnate to tepals; anthers slightly incurved, flattened; connective slightly wider than loculi, extending beyond loculi as a rounded, slightly concave appendage. Hypogynous glands 4, equal. Gynoecium longer than stamens; ovary contracted at base, sessile; style recurved at tip but otherwise straight; ovules 2. Pyrene transversely ribbed; seed 1. Cotyledons 2. 

A monospecific genus, endemic in south-western Australia. 

The generic circumscription adopted here is radically different to that of Johnson & Briggs (ibid. ). Those authors included Persoonia groups Rufiflora , Dillwynioides , Graminea , Chapmaniana and Quinquenervis in their concept of Acidonia . Acidonia microcarpa has a taxonomically basal position in the Persoonieae, most probably being the sister group of Persoonia or of Toronia and Garnieria .

P.H.Weston, The Western Australian species of subtribe Persooniinae (Proteaceae: Persoonioideae: Persoonieae), Telopea 6: 51–165 (1994).



Data derived from Flora of Australia Volumes 16 (1995), 17A (2000) and 17B (1999), products of ABRS, ©Commonwealth of Australia