Common Names: Diamond Leaf Pittosporum
Scientific Name: Crescentia mirabilis Ekman ex Urb.
Family: Auranticarpa rhombifolia L.W.Cayzer, Crisp & I.Telford
Genus: Auranticarpa - from ‘aurantius’, the Latin term for orange, and the Greek ‘carpus’ for fruit, referring to the colour of the fruit of members of the genus.
Species: Rhombifolia refers to the rhomboidal shape of the leaves.
Richmond River, New South Wales, to Forty Mile Scrub National Park in tropical Queensland.
Common in sub-tropical and dry rainforest on red basaltic soils in coastal districts.
Small to medium tree, 13–30 m high, generally with a narrow canopy and columnar shape. Leaves alternate or clustered at the end of branches, angular-obovate to rhombic, 86–120 mm long, 35–70 mm wide, smooth (glabrous) with wavy or undulating margins.
Small, white to cream coloured, fragrant flowers (petals 5–6 mm long) occur in large numbers aggregated in a terminal cluster referred to botanically as a corymb. Flowering time is November to January.
The distinctive fruit is an orange pear-shaped capsule, 5–10 mm long with 2 to 3 oval black seeds. Fruits mature from February to May.
Location in Garden
Bed 5 opposite the Levy Fountain, Bed 131 near the Northern Depot Gate (http://plantnet.rbgsyd.nsw.gov.au/TreesRBGDomain/)
The Diamond Leaf Pittosporum has been planted in many parts of Australia as an ornamental or street tree due to its hardiness but also for its floral show in summer followed by its striking display of orange fruit throughout the autumn. This is especially the case in warmer gardens looking for points of interest in autumn where the colour provided by deciduous trees is mostly absent. Propagation is by fresh seed although germination is slow and can take up to four months.
Auranticarpa is a genus, named in the year 2000, that includes only six species, all trees and all endemic to Australia, occurring in rainforest or monsoonal rainforest in northern Australia. Auranticarpa rhombifolia formerly known as Pittosporum rhombifolia is the only species that occurs naturally in NSW.
Must See in the Garden
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